(d) Where the mortgagor delivers possession or expressly or by implication binds himself to deliver possession of the mortgaged property to the mortgagee, and authorises him to retain such possession until payment of the mortgage-money, and to receive the rents and profits accruing from the property or any part of such rents and profits and to appropriate the same in lieu of interest, or in payment of the mortgage-money, or partly in lieu of interest or partly in payment of the mortgage-money, the transaction is called an usufructuary mortgage and the mortgagee an usufructuary mortgagee.