ADVANTUS MORTGAGE SECURITIES FUND INC
485BPOS, 1999-02-01
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<PAGE>

                                              File Numbers 2-94173 and 811-4140

                         SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C. 20549
                                          
                                          
                                     Form N-1A

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933  X
                                                                     ---

                          Pre-Effective Amendment Number
                                                         ---
   
                         Post-Effective Amendment Number 18
    
                                       and/or


       REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940  X
                                                                       ---
   
                                Amendment Number 18
    

                      ADVANTUS MORTGAGE SECURITIES FUND, INC.
                 (Exact Name of Registrant as Specified in Charter)


                400 ROBERT STREET NORTH, ST. PAUL, MINNESOTA  55101
                      (Address of Principal Executive Offices)
         REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (651) 665-3826


        ERIC J. BENTLEY, 400 ROBERT STREET NORTH, ST. PAUL, MINNESOTA 55101
                     (Name and Address of Agent for Service)  


                                      Copy to:
                             Michael J. Radmer, Esquire
                                Dorsey & Whitney LLP
                               220 South Sixth Street
                         Minneapolis, Minnesota  55402-1498

IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (check appropriate box)
   
           X   immediately upon filing pursuant to paragraph (b)
          ---
               On (date) pursuant to paragraph (b)
          ---
               60 days after filing pursuant to paragraph (a)(1)
          ---
               on (date) pursuant to paragraph (a)(1)
          ---
               75 days after filing pursuant to paragraph (a)(2)
          ---
               on (date) pursuant to paragraph (a)(2) of Rule 485.
          ---
    
IF APPROPRIATE, CHECK THE FOLLOWING BOX:
               this post-effective amendment designates a new effective date
          ---  for a previously filed post-effective amendment.

<PAGE>

   
Part A and Part B to the Registration Statement on Form N-1A for Advantus 
Mortgage Securities Fund, Inc. are incorporated herein by reference, in their 
entirety, from Post-Effective Amendment Number 17 filed December 3, 1998.
    
<PAGE>
                             PART C.  OTHER INFORMATION

ITEM 23.  EXHIBITS

     The exhibits to this Registration Statement are listed in the Exhibit Index
hereto and are incorporated herein by reference.

ITEM 24.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE FUND

Wholly-owned subsidiary of Minnesota Mutual Companies, Inc.:

     Securian Holding Company (Delaware)

Wholly-owned subsidiary of Securian Holding Company:

     Securian Financial Group, Inc. (Delaware)

Wholly-owned subsidiary of Securian Financial Group, Inc.

     Minnesota Life Insurance Company

Wholly-owned subsidiaries of Minnesota Life Insurance Company:

     Advantus Capital Management, Inc.
     HomePlus Insurance Company
     Northstar Life Insurance Company (New York)
     The Ministers Life Insurance Company
     Robert Street Energy, Inc.
     Capitol City Property Management, Inc.
     DataPlan Securities, Inc. (Ohio)
     MIMLIC Imperial Corporation
     MIMLIC Funding, Inc.
     MCM Funding 1997-1, Inc.
     MCM Funding 1998-1, Inc.
     Personal Finance Company (Delaware)
     MIMLIC Venture Corporation
     HomePlus Insurance Agency, Inc.
     Ministers Life Resources, Inc.
     Enterprise Holding Corporation
     Wedgewood Valley Golf, Inc.

Open-end registered investment company offering shares solely to separate
accounts of Minnesota Life Insurance Company:

     Advantus Series Fund, Inc.

Wholly-owned subsidiary of Advantus Capital Management, Inc.:

     Ascend Financial Services, Inc.

Wholly-owned subsidiaries of Ascend Financial Services, Inc.:

     MIMLIC Insurance Agency of Massachusetts, Inc. (Massachusetts)
     MIMLIC Insurance Agency of Texas, Inc. (Texas)
     Ascend Insurance Agency of Nevada, Inc. (Nevada)
     Ascend Insurance Agency of Oklahoma, Inc. (Oklahoma)

<PAGE>

Wholly-owned subsidiaries of Enterprise Holding Corporation:

     Financial Ink Corporation
     Oakleaf Service Corporation
     Concepts in Marketing Research Corporation
     Concepts in Marketing Services Corporation
     Lafayette Litho, Inc.

Wholly-owned subsidiary of HomePlus Insurance Agency, Inc.:

     HomePlus Insurance Agency of Texas, Inc. (Texas)

Majority-owned subsidiaries of MIMLIC Imperial Corporation:

     J. H. Shoemaker Advisory Corporation (Tennessee)
     Consolidated Capital Advisors, Inc. (Tennessee)

Majority-owned subsidiary of Ascend Financial Services, Inc.:

     MIMLIC Insurance Agency of Ohio, Inc. (Ohio)

Majority-owned subsidiaries of Minnesota Life Insurance Company:

     MIMLIC Life Insurance Company (Arizona)
     Advantus Enterprise Fund, Inc.
     Advantus International Balanced Fund, Inc.
     Advantus Venture Fund, Inc.

Fifty percent-owned subsidiary of MIMLIC Imperial Corporation:

     C.R.I. Securities, Inc.

Less than majority owned, but greater than 25% owned, subsidiaries of Minnesota
Life Insurance Company:

     Advantus Money Market Fund, Inc.
     MIMLIC Cash Fund, Inc.
     Advantus Cornerstone Fund, Inc.
     Advantus Index 500 Fund, Inc.

Less than 25% owned subsidiaries of Minnesota Life Insurance Company:

     Advantus Horizon Fund, Inc.
     Advantus Spectrum Fund, Inc.
     Advantus Mortgage Securities Fund, Inc.
     Advantus Bond Fund, Inc.

Unless indicated otherwise parenthetically, each of the above corporations is a
Minnesota corporation.

ITEM 25.  INDEMNIFICATION

     The Articles of Incorporation and Bylaws of the Registrant provide that the
Registrant shall indemnify such persons, for such expenses and liabilities, in
such manner, under such circumstances, to the full extent permitted by Section
302A.521, Minnesota Statutes, as now enacted or hereafter amended, provided that
no such indemnification may be made if it would be in violation of Section 17(h)
of the Investment Company Act of 1940, as now 

<PAGE>

enacted or hereafter amended. Section 302A.521 of the Minnesota Statutes, as 
now enacted, provides that a corporation shall indemnify a person made or 
threatened to be made a party to a proceeding against judgments, penalties, 
fines, settlements and reasonable expenses, including attorneys' fees and 
disbursements, incurred by the person in connection with the proceeding, if, 
with respect to the acts or omissions of the person complained of in the 
proceeding, the person has not been indemnified by another organization for 
the same judgments, penalties, fines, settlements and reasonable expenses 
incurred by the person in connection with the proceeding with respect to the 
same acts or omissions; acted in good faith; received no improper personal 
benefit and the Minnesota Statute dealing with directors' conflicts of 
interest, if applicable, has been satisfied; in the case of a criminal 
proceeding, had no reasonable cause to believe the conduct was unlawful and 
reasonably believed that the conduct was in the best interests of the 
corporation or, in certain circumstances, reasonably believed that the 
conduct was not opposed to the best interests of the corporation.  

     Section 17(h) of the Investment Company Act of 1940 provides that 
neither the charter, certificate of incorporation, articles of association, 
indenture of trust, nor the by-laws of any registered investment company, nor 
any other instrument pursuant to which such a company is organized or 
administered, shall contain any provisions which protects or purports to 
protect any director or officer of such company against any liability to the 
company or to its security holders to which he would otherwise be subject by 
reason of willful misfeasance, bad faith, gross negligence or reckless 
disregard of duties involved in the conduct of his office.  The staff of the 
Securities and Exchange Commission has stated that it is of the view that an 
indemnification provision does not violate Section 17(h) if it precludes 
indemnification for any liability arising by reason of willful misfeasance, 
bad faith, gross negligence, or reckless disregard of duties ("Disabling 
conduct") and sets forth reasonable and fair means for determining whether 
indemnification shall be made.  In the staff's view, "reasonable and fair 
means" would include (1) a final decision on the merits by a court or other 
body before whom the proceeding was brought that the person to be indemnified 
("indemnitee") was not liable by reason of disabling conduct or, (2) in the 
absence of such a decision, a reasonable determination, based upon a review 
of the facts, that the indemnitee was not liable by reason of disabling 
conduct, by (a) the vote of a majority of a quorum of directors who are 
neither "interested persons" of the company as defined in Section 2(a)(19) of 
the Investment Company Act of 1940 nor parties to the proceeding 
("disinterested, non-party directors") or (b) an independent legal counsel in 
a written opinion.  The dismissal of either a court action or administrative 
proceeding against an indemnitee for insufficiency of evidence of any 
disabling conduct with which he has been charged would, in the staff's view, 
provide reasonable assurance that he was not liable by reason of disabling 
conduct.  The staff also believes that a determination by the vote of a 
majority of a quorum of disinterested, non-party directors would provide 
reasonable assurance that the indemnitee was not liable by reason of 
disabling conduct.

     Insofar as indemnification for liability arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable.  In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred
or paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or 

<PAGE>

proceeding) is asserted by such director, officer or controlling person in 
connection with the securities being registered, the Registrant will, unless 
in the opinion of its counsel the matter has been settled by controlling 
precedent, submit to a court of appropriate jurisdiction the question whether 
such indemnification by it is against public policy as expressed in the Act 
and will be governed by the final adjudication of such issue.

ITEM 26.  BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER

<TABLE>
<CAPTION>

Directors and Officers        Office with
of Investment Adviser         Investment Adviser            Other Business Connections
- ----------------------        ------------------            ---------------------------
<S>                           <C>                           <C>
William N. Westhoff           President, Treasurer          Vice President and Director,
                              and Director                  Robert Street Energy, Inc.; Senior 
                                                            Vice President and Treasurer, Minnesota 
                                                            Life Insurance Company; President, MCM 
                                                            Funding 1997-1, Inc.; President, MCM 
                                                            Funding 1998-1, Inc.

Frederick P. Feuerherm        Vice President,               Vice President, Minnesota 
                              Assistant Secretary           Life Insurance Company;
                              and Director                  Vice President and Director, MIMLIC 
                                                            Funding, Inc.; Vice President and 
                                                            Assistant Secretary, MCM Funding 1997-1, 
                                                            Inc.; Vice President and Assistant 
                                                            Secretary, MCM Funding 1998-1, Inc.

Guy M. de Lambert             Vice President,               Second Vice President, 
                              Secretary and                 Minnesota Life Insurance
                              Director                      Company; President, Secretary and 
                                                            Director, Personal Finance Company; 
                                                            President and Director, Wedgewood Valley 
                                                            Golf, Inc.; President and Director, 
                                                            MIMLIC Venture Corporation; President 
                                                            and Director, MIMLIC Funding, Inc.; President, 
                                                            Secretary and Director, Robert Street Energy, 
                                                            Inc.; Vice President and Secretary, MCM 
                                                            Funding 1997-1, Inc.; Vice President and 
                                                            Secretary, MCM Funding 1998-1, Inc.

Lynne M. Mills                Vice President                Second Vice President, Minnesota Life 
                                                            Insurance Company; Vice President and Director, 
                                                            Robert Street Energy, Inc.; Vice President, 
                                                            MCM Funding 1997-1, Inc.; Vice

<PAGE>

                                                            President, MCM Funding 1998-1, Inc.

Dianne Orbison                Vice President                Second Vice President, Minnesota Life 
                                                            Insurance Company; Vice President and 
                                                            Director, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MIMLIC Venture Corporation; 
                                                            Vice President and Director, MCM Funding 
                                                            1998-1, Inc.

Richard W. Worthing           Vice President and            Vice President, MCM Funding
                              Head of Equities              1997-1, Inc.; Vice President, MIMLIC 
                                                            Funding, Inc.; Vice President, MCM Funding 
                                                            1998-1, Inc.; Second Vice President, 
                                                            Minnesota Life Insurance Company

James P. Tatera               Vice President,               Second Vice President,
                              Equity Portfolio              Minnesota Life Insurance 
                              Manager                       Company; Vice President, MIMLIC Funding, Inc.; 
                                                            Vice President and Assistant Secretary, MCM 
                                                            Funding 1997-1, Inc.; Vice President and 
                                                            Assistant Secretary, MCM Funding 1998-1, Inc.

Marilyn Froelich              Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Director, 
                                                            Investment Advisory, Minnesota Life Insurance 
                                                            Company

Loren Haugland                Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Senior 
                                                            Investment Officer, Minnesota Life Insurance 
                                                            Company

Thomas A. Gunderson           Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Investment 
                                                            Officer, Total Return, Minnesota Life Insurance 
                                                            Company

Kent R. Weber                 Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 

<PAGE>

                                                            1998-1, Inc.; Investment Officer, Total Return, 
                                                            Minnesota Life Insurance Company

Jeffrey R. Erickson           Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Investment 
                                                            Officer, Total Return, Minnesota Life Insurance 
                                                            Company

Gary A. Aster                 Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Investment 
                                                            Officer, Equities, Minnesota Life Insurance 
                                                            Company

Wayne R. Schmidt              Vice President                Secretary and Treasurer, MIMLIC Funding, Inc.; 
                                                            Assistant Secretary and Treasurer, Robert 
                                                            Street Energy, Inc.; Vice President and 
                                                            Secretary, MIMLIC Imperial Corporation; Vice 
                                                            President and Assistant Secretary, MCM Funding 
                                                            1997-1, Inc.; Vice President and Assistant 
                                                            Secretary, MCM Funding 1998-1, Inc.; Investment 
                                                            Officer - Fixed Income PM, Minnesota Life 
                                                            Insurance Company

Joseph R. Betlej              Vice President                Vice President, Secretary and Director, 
                                                            Wedgewood Valley Golf, Inc.; Vice President and 
                                                            Secretary, MIMLIC Venture Corporation; Vice 
                                                            President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Senior 
                                                            Investment Officer, Minnesota Life Insurance 
                                                            Company

Steven Laude                  Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice President, MCM Funding
                                                            1998-1, Inc.; Senior Investment Officer - Fixed Income, Minnesota Life
                                                            Insurance Company

<PAGE>

Erica Bergsland               Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Senior 
                                                            Investment Officer - Mortgage, Minnesota Life 
                                                            Insurance Company

Thomas G. Meyer               Vice President                Vice President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.; Director, 
                                                            Marketing Development, Minnesota Life Insurance 
                                                            Company

Rodney Hare                   Vice President                Director of Institutional Marketing, Minnesota 
                                                            Life Insurance Company; Vice President, MCM 
                                                            Funding 1997-1, Inc.; Vice President, MCM 
                                                            Funding 1998-1, Inc.

Gary Kleist                   Financial Vice                Director, Investment Operations, 
                              President                     Minnesota Life Insurance Company; Vice 
                                                            President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding, 1998-1, Inc.

Sean O'Connell                Vice President                Senior Investment Officer - Mortgage, Minnesota 
                                                            Life Insurance Company; Vice President, MCM 
                                                            Funding 1997-1, Inc.; Vice President, MCM 
                                                            Funding 1998-1, Inc.

John Leiviska                 Vice President                Senior Investment Officer - Fixed Income, 
                                                            Minnesota Life Insurance Company; Vice 
                                                            President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.

Annette Masterson             Vice President                Senior Investment Officer - Fixed Income, 
                                                            Minnesota Life Insurance Company; Vice 
                                                            President, MCM Funding 1997-1, Inc.; Vice 
                                                            President, MCM Funding 1998-1, Inc.

Mark L. Henneman              Vice President                Value Portfolio Manager, Minnesota Life 
                                                            Insurance 

<PAGE>

                                                            Company; Vice President, MCM Funding 1997-1, 
                                                            Inc.; Vice President, MCM Funding 1998-1, Inc.

Kevin J. Hiniker              Associate General             Investment Officer - Law and Assistant 
                              Counsel                       Secretary, Minnesota Life Insurance Company; 
                                                            Assistant Secretary, Robert Street Energy, 
                                                            Inc.; Assistant Secretary, MCM Funding 1997-1, 
                                                            Inc.; Assistant Secretary, MCM Funding 1998-1, 
                                                            Inc. 
</TABLE>

ITEM 27.  PRINCIPAL UNDERWRITERS

     (a)  Ascend Financial Services, Inc. currently acts as a principal
underwriter for the following investment companies:

          Advantus Horizon Fund, Inc.
          Advantus Spectrum Fund, Inc.
          Advantus Mortgage Securities Fund, Inc.
          Advantus Money Market Fund, Inc.
          Advantus Bond Fund, Inc.
          Advantus Cornerstone Fund, Inc.
          Advantus Enterprise Fund, Inc.
          Advantus International Balanced Fund, Inc.
          Advantus Venture Fund, Inc.
          Advantus Index 500 Fund, Inc.
          MIMLIC Cash Fund, Inc.
          Variable Fund D
          Variable Annuity Account
          Minnesota Life Variable Life Account
          Group Variable Annuity Account
          Minnesota Life Variable Universal Life Account

          (b)  The name and principal business address, positions and offices
with Ascend Financial Services, Inc., and positions and offices with Registrant
of each director and officer of Ascend Financial Services, Inc. is as follows:

<TABLE>
<CAPTION>
                                    Positions and                        Positions and
Name and Principal                  Offices                              Offices
Business Address                    with Underwriter                     with Registrant
- ------------------                  ----------------                     ---------------
<S>                                 <C>                                  <C>       
Robert E. Hunstad                   Director                             None
Minnesota Life 
  Insurance Company
400 Robert Street North
St. Paul, Minnesota 55101

George I. Connolly                  President, Chief                     None
Ascend Financial Services, Inc.     Executive Officer, Chief
400 Robert Street North             Compliance Officer and
St. Paul, Minnesota 55101           Director

<PAGE>

Margaret Milosevich                 Vice President, Chief                Assistant 
Ascend Financial Services, Inc.     Operations Officer,                  Secretary
400 Robert Street North             Treasurer and Secretary
St. Paul, Minnesota 55101

Dennis E. Prohofsky                 Director                             None
Minnesota Life 
  Insurance Company
400 Robert Street North
St. Paul, Minnesota 55101

Thomas L. Clark                     Assistant Treasurer                  Assistant
Ascend Financial Services, Inc.     and Assistant Secretary              Secretary
400 Robert Street North
St. Paul, Minnesota 55101

</TABLE>

     (c)  Not applicable.

ITEM 28.  LOCATION OF ACCOUNTS AND RECORDS

     The physical possession of the accounts, books and other documents required
to be maintained by Section 3(a) of the Investment Company Act of 1940 and Rules
31a-1 to 31a-3 promulgated thereunder is maintained by Minnesota Life, 400
Robert Street North, St. Paul, Minnesota 55101; except that the physical
possession of certain accounts, books and other documents related to the custody
of the Registrant's securities is maintained by the following custodian:

     Bankers Trust Company
     280 Park Avenue
     New York, New York  10017

ITEM 29.  MANAGEMENT SERVICES

     Not applicable.

ITEM 30.  UNDERTAKINGS

     (a)  Not applicable.

     (b)  Not applicable.

     (c)  The Registrant hereby undertakes to furnish, upon request and without
charge to each person to whom a prospectus is delivered, a copy of the
Registrant's latest annual report to shareholders containing the information
called for by Item 5A.

<PAGE>

                                   SIGNATURES

   
     Pursuant to the requirements of the Securities Act of 1933 and the 
Investment Company Act of 1940 the Registrant certifies that it meets all of 
the requirements for effectiveness of this Registration Statement pursuant to 
Rule 485(b) under the Securities Act of 1933 and has duly caused this 
Post-Effective Amendment to its Registration Statement to be signed on its 
behalf by the undersigned, thereto duly authorized, in the City of St. Paul 
and the State of Minnesota on the 1st day of February, 1999.
    

                              ADVANTUS MORTGAGE SECURITIES FUND, INC.
                              Registrant


                              By
                                ----------------------------------------------
                                        William N. Westhoff, President


     Pursuant to the requirements of the Securities Act of 1933, this 
Post-Effective Amendment to the Registration Statement has been signed below 
by the following persons in the capacities and on the date indicated.
   

- --------------------------------   President (principal     February 1, 1999
  William N. Westhoff              executive officer)
                                   and Director


- --------------------------------   Director and Treasurer   February 1, 1999
  Frederick P. Feuerherm           (principal financial
                                   and accounting officer)

  RALPH D. EBBOTT*              
- --------------------------------     Director)
  Ralph D. Ebbott                            )  By
                                             )    ----------------------------
  CHARLES E. ARNER*                          )         William N. Westhoff
- --------------------------------     Director)           Attorney-in-Fact    
  Charles E. Arner                           )                             
                                             )      Dated:  February 1, 1999
  ELLEN S. BERSCHEID*                        )
- --------------------------------     Director)
  Ellen S. Berscheid                         )
    

- ----------------------
*Registrant's director executing power of attorney dated October 22, 1998, a
copy of which is filed herewith.

<PAGE>

                       ADVANTUS MORTGAGE SECURITIES FUND, INC.
                                   EXHIBIT INDEX

Exhibit Number and Description:

(a)       Restated Articles of Incorporation for the Registrant. (1)

(b)       Revised Bylaws of the Registrant. (1)

(c)       Not applicable.

(d)       Investment Advisory Agreement between Advantus Capital Management,
          Inc. and the Registrant. (1)
   
(e)(1)    Underwriting and Distribution Agreement between the Registrant and
          Ascend Financial Services, Inc. (2)
    
   
(e)(2)    Dealer Sales Agreement between Ascend Financial Services, Inc.,
          principal underwriter for the Registrant, and dealers. (2)
    
(f)       Not applicable.

(g)       Custodian Agreement between the Registrant and Bankers Trust Company.
          (1)
   
(h)       Shareholder and Administrative Services Agreement between the
          Registrant and The Minnesota Mutual Life Insurance Company. (2)
    
   
(i)       Opinion and Consent of Dorsey & Whitney LLP. 
    
   
(j)       Consent of KPMG Peat Marwick LLP. (2)
    
(k)       Not applicable.

(l)       Letter of Investment Intent regarding the Registrant's initial
          capital. (1)
   
(m)(1)    Plan of Distribution for Class A shares of the Registrant. (2)
    
(m)(2)    Plan of Distribution for Class B shares of the Registrant. (1)

(m)(3)    Plan of Distribution for Class C shares of the Registrant. (1)

(n)(1)    Financial Data Schedule for Class A shares of the Registrant.

(n)(2)    Financial Data Schedule for Class B shares of the Registrant.

(n)(3)    Financial Data Schedule for Class C shares of the Registrant.
   
(o)       Multiple Class Plan pursuant to Rule 18f-3. (2)
    
(p)       Power of Attorney to sign Registration Statement executed by Directors
          of Registrant.

- --------------------------------
(1)       Incorporated by reference to the Registrant's Registration Statement
on Form N-1A filed January 26, 1996.
   
(2)       Incorporated by reference to the Registrant's Registration Statement
on Form N-1A filed December 3, 1998.
    


<PAGE>

                                     [LETTERHEAD]






Advantus Mortgage Securities Fund, Inc.
400 Robert Street North
St. Paul, Minnesota 55101

Ladies and Gentlemen:

          We have acted as counsel to Advantus Mortgage Securities Fund, Inc., a
Minnesota corporation (the "Fund"), in connection with a Registration Statement
on Form N-1A (File Nos. 2-94173 and 811-4140) (the "Registration Statement")
relating to the sale by the Fund of an indefinite number of shares of the Fund's
Class A Common Shares, Class B Common Shares and Class C Common Shares, each
with a par value of $.01 per share (the "Shares").

          We have examined such documents and have reviewed such questions of
law as we have considered necessary and appropriate for the purposes of our
opinions set forth below.  In rendering our opinions set forth below, we have
assumed the authenticity of all documents submitted to us as originals, the
genuineness of all signatures and the conformity to authentic originals of all
documents submitted to us as copies.  We have also assumed the legal capacity
for all purposes relevant hereto of all natural persons and, with respect to all
parties to agreements or instruments relevant hereto other than the Fund, that
such parties had the requisite power and authority (corporate or otherwise) to
execute, deliver and perform such agreements or instruments, that such
agreements or instruments have been duly authorized by all requisite action
(corporate or otherwise), executed and delivered by such parties and that such
agreements or instruments are the valid, binding and enforceable obligations of
such parties.  As to questions of fact material to our opinions, we have relied
upon certificates of officers of the Fund and of public officials.  We have also
assumed that the Shares will be issued and sold as described in the Registration
Statement.

          Based on the foregoing, we are of the opinion that upon issuance,
delivery and payment for the Shares as described in the Registration Statement,
the Shares will be validly issued, fully paid and nonassessable.

<PAGE>

Advantus Mortgage Securities Fund, Inc.
January 29, 1999
Page 2


          We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the references to our firm under the caption
"Service Providers" in the Prospectus and under the caption "Investment Advisory
and Other Services" in the Statement of Additional Information, each
constituting part of the Registration Statement.

Dated: January 29, 1999

                                             Very truly yours,

                                             /s/ Dorsey & Whitney LLP




KLP

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM N-SAR
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED> 
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
   <NUMBER> 100
   <NAME> CLASS A
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               SEP-30-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           47,599
<INVESTMENTS-AT-VALUE>                          48,886
<RECEIVABLES>                                    6,294
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  55,180
<PAYABLE-FOR-SECURITIES>                         7,381
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        1,109
<TOTAL-LIABILITIES>                              8,490
<SENIOR-EQUITY>                                     43
<PAID-IN-CAPITAL-COMMON>                        45,828
<SHARES-COMMON-STOCK>                            3,002
<SHARES-COMMON-PRIOR>                            2,664
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (468)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         1,287
<NET-ASSETS>                                    32,268
<DIVIDEND-INCOME>                                   44
<INTEREST-INCOME>                                2,867
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     478
<NET-INVESTMENT-INCOME>                          2,433
<REALIZED-GAINS-CURRENT>                           586
<APPREC-INCREASE-CURRENT>                          392
<NET-CHANGE-FROM-OPS>                            3,411
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        1,866
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                               99
<NUMBER-OF-SHARES-SOLD>                            904
<NUMBER-OF-SHARES-REDEEMED>                        686
<SHARES-REINVESTED>                                120
<NET-CHANGE-IN-ASSETS>                          10,334
<ACCUMULATED-NII-PRIOR>                             23
<ACCUMULATED-GAINS-PRIOR>                      (1,054)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              239
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    613
<AVERAGE-NET-ASSETS>                            30,585
<PER-SHARE-NAV-BEGIN>                            10.54
<PER-SHARE-NII>                                   0.64
<PER-SHARE-GAIN-APPREC>                           0.25
<PER-SHARE-DIVIDEND>                              0.65
<PER-SHARE-DISTRIBUTIONS>                         0.03
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.75
<EXPENSE-RATIO>                                   0.95
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM N-SAR
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED> 
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
   <NUMBER> 101
   <NAME> CLASS B
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               SEP-30-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           47,599
<INVESTMENTS-AT-VALUE>                          48,886
<RECEIVABLES>                                    6,294
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  55,180
<PAYABLE-FOR-SECURITIES>                         7,381
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        1,109
<TOTAL-LIABILITIES>                              8,490
<SENIOR-EQUITY>                                     43
<PAID-IN-CAPITAL-COMMON>                        45,828
<SHARES-COMMON-STOCK>                              936
<SHARES-COMMON-PRIOR>                              576
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (468)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         1,287
<NET-ASSETS>                                    10,079
<DIVIDEND-INCOME>                                   44
<INTEREST-INCOME>                                2,867
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     478
<NET-INVESTMENT-INCOME>                          2,433
<REALIZED-GAINS-CURRENT>                           586
<APPREC-INCREASE-CURRENT>                          392
<NET-CHANGE-FROM-OPS>                            3,411
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          429
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                               31
<NUMBER-OF-SHARES-SOLD>                            571
<NUMBER-OF-SHARES-REDEEMED>                        245
<SHARES-REINVESTED>                                 34
<NET-CHANGE-IN-ASSETS>                          10,334
<ACCUMULATED-NII-PRIOR>                             23
<ACCUMULATED-GAINS-PRIOR>                      (1,054)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              239
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    613
<AVERAGE-NET-ASSETS>                             8,032
<PER-SHARE-NAV-BEGIN>                            10.56
<PER-SHARE-NII>                                   0.57
<PER-SHARE-GAIN-APPREC>                           0.24
<PER-SHARE-DIVIDEND>                              0.57
<PER-SHARE-DISTRIBUTIONS>                         0.03
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.77
<EXPENSE-RATIO>                                   1.70
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM N-SAR
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED> 
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
   <NUMBER> 102
   <NAME> CLASS C
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               SEP-30-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           47,599
<INVESTMENTS-AT-VALUE>                          48,886
<RECEIVABLES>                                    6,294
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  55,180
<PAYABLE-FOR-SECURITIES>                         7,381
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        1,109
<TOTAL-LIABILITIES>                              8,490
<SENIOR-EQUITY>                                     43
<PAID-IN-CAPITAL-COMMON>                        45,828
<SHARES-COMMON-STOCK>                              404
<SHARES-COMMON-PRIOR>                              207
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (468)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         1,287
<NET-ASSETS>                                     4,343
<DIVIDEND-INCOME>                                   44
<INTEREST-INCOME>                                2,867
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     478
<NET-INVESTMENT-INCOME>                          2,433
<REALIZED-GAINS-CURRENT>                           586
<APPREC-INCREASE-CURRENT>                          392
<NET-CHANGE-FROM-OPS>                            3,411
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          161
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                               12
<NUMBER-OF-SHARES-SOLD>                            410
<NUMBER-OF-SHARES-REDEEMED>                        227
<SHARES-REINVESTED>                                 14
<NET-CHANGE-IN-ASSETS>                          10,334
<ACCUMULATED-NII-PRIOR>                             23
<ACCUMULATED-GAINS-PRIOR>                      (1,054)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              239
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    613
<AVERAGE-NET-ASSETS>                             3,000
<PER-SHARE-NAV-BEGIN>                            10.55
<PER-SHARE-NII>                                   0.58
<PER-SHARE-GAIN-APPREC>                           0.23
<PER-SHARE-DIVIDEND>                              0.57
<PER-SHARE-DISTRIBUTIONS>                         0.03
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.76
<EXPENSE-RATIO>                                   1.70
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>

                                    POWER OF ATTORNEY
                              TO SIGN REGISTRATION STATEMENT


        The undersigned, Directors of Advantus Horizon Fund, Inc., Advantus 
Spectrum Fund, Inc., Advantus Mortgage Securities Fund, Inc., Advantus Money 
Market Fund, Inc., Advantus Bond Fund, Inc., Advantus Cornerstone Fund, Inc., 
Advantus Enterprise Fund, Inc., Advantus International Balanced Fund, Inc., 
Advantus Venture Fund, Inc., Advantus Index 500 Fund, Inc., Advantus Real 
Estate Securities Fund, Inc., MIMLIC Cash Fund, Inc., and Advantus Series 
Fund, Inc.  (the "Funds"), appoint William N. Westhoff, Eric J. Bentley, 
Donald F. Gruber and Michael J. Radmer, and each of them individually, as 
attorney-in-fact for the purpose of signing in their names and on their 
behalf as Directors of the Funds and filing with the Securities and Exchange 
Commission Registration Statements on Form N-1A, or any amendments thereto, 
for the purpose of registering shares of Common Stock of the Funds for sale 
by the Funds and to register the Funds under the Investment Company Act of 
1940.



Dated:  October 22, 1998                 /s/Charles E. Arner               
                                         -----------------------------------
                                                   Charles E. Arner



                                         /s/Ellen S. Berscheid             
                                         -----------------------------------
                                                  Ellen S. Berscheid



                                         /s/Ralph D. Ebbott             
                                         -----------------------------------
                                                 Ralph D. Ebbott



                                         /s/Frederick P. Feuerherm            
                                         -----------------------------------
                                                 Frederick P. Feuerherm



                                         /s/William N. Westhoff
                                         -----------------------------------
                                                William N. Westhoff


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