¹[67A.  Mortgagee when bound to bring one suit on several inortgages.-- A mortgagee who holds two or more mortgages executed by the same mortgagor in respect of each of which he has a right to obtain the same kind of decree under section 67, and who sues to obtain such decree on any one of the mortgages, shall, in the absence of a contract to the contrary, be bound to sue on all the mortgages in respect of which the mortgage-money has become due.]