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Pricing Supplement No. 27 dated August 6, 1997         Registration No. 33-52571
(To Prospectus Supplement dated December 16, 1994            Rule 424(b)(3)
    and Prospectus dated March 18, 1994)

                             BANKBOSTON CORPORATION
                 (formerly known as Bank of Boston Corporation)

                                MEDIUM-TERM NOTES

                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE

                              --------------------

         Except as set forth herein, the Senior Notes offered hereby are "Fixed
Rate Notes" and have such terms as are described in the accompanying Prospectus
Supplement dated December 16, 1994, relating to Fixed Rate Notes. This Pricing
Supplement relates to $50,000,000 aggregate principal amount of Senior Notes
that are being purchased, as principal, by Morgan Stanley & Co. ("Morgan
Stanley") for resale to one or more investors at varying prices determined by
Morgan Stanley. Net proceeds payable by Morgan Stanley to BankBoston Corporation
(the "Corporation") will be 100% of the aggregate principal amount of the Senior
Notes, or $50,000,000, before deduction of expenses payable by the Corporation.

DTC CUSIP #: 06420MAX8

Principal Amount: $50,000,000

Issue Date (Settlement Date): August 11, 1997

Stated Maturity Date: August 11, 2000

Issue Price: 100% of Principal Amount

Proceeds to the
Corporation: $50,000,000

Interest Rate(s)
     (Fixed Rate Notes): 6.38%

Initial Interest Rate
     (Floating Rate Notes): N/A

Interest Payment Dates:        [ ] June 15 and December 15 of each year.
                             
                               [x] Other:
                                       February 11, 1998       August 11, 1998
                                       February 11, 1999       August 11, 1999
                            
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                                       February 11, 2000       August 11, 2000

Record Dates:                  [X] Fifteenth calendar day (whether or not a 
                               Business Day) next preceding each Interest 
                               Payment Date.
                         
Interest Rate Basis
     (Floating Rate Notes):     N/A

Interest Calculation
     (Floating Rate Notes):     N/A

Index Maturity
     (Floating Rate Notes):     N/A

Index Currency
(LIBOR Notes):                  N/A

Designated LIBOR Page
     (LIBOR Notes):             N/A

Designated CMT Telerate
Page (CMT Rate Notes):          N/A

Designated CMT Maturity
Index (CMT Rate Notes):         N/A

Prime Rate Notes
(Floating Rate Notes):          N/A

Spread (Plus or Minus)
     (Floating Rate Notes):     N/A

Spread Multiplier
     (Floating Rate Notes):     N/A

Interest Rate Formula
     (Floating Rate Notes):     N/A

Interest Reset Dates
     (Floating Rate Notes):     N/A

Interest Determination Dates
     (Floating Rate Notes):     N/A

Calculation Agent (if other

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     than the Bank)
     (Floating Rate Notes):     N/A

Minimum Interest Rate
     (Floating Rate Notes):     N/A

Maximum Interest Rate
     (Floating Rate Notes):     N/A

Redemption Date(s):             N/A

Initial Redemption Percentage:  N/A

Annual Redemption
     Percentage Reduction:      N/A

Holder's Optional
     Repayment Date(s):         N/A

Day Count Convention
     (Fixed Rate Notes):        [X] 30/360 for the period from August 11, 1997 
                                to August 11, 2000.

                                [ ] Actual/360 for the period from _____________
                                     to  ____________.

Original Issue
     Discount Note:             [ ] Yes
                                [X] No

Total Amount of OID:            N/A

Yield to Maturity:              N/A

Interest Accrual
     Period:                    N/A

Default Rate:                   N/A

Other Provisions: Terms used but not defined in this Pricing Supplement shall
have the meanings specified in the above-referenced Prospectus Supplement.