This is the second contribution in the series Contributions to the Molluscan Fauna of India. In the earlier part systematic studies on the order Archaeogastropoda was completed by the present authors (Rajagopal and Mookherjee, 1978).
This part deals with systematic studies of eight families namely, Littorinidae, Turritellidae, Architectonicidae, Planaxidae, Potamididae, Cerithiidae, Epitoniidae and Janthinidae under the order Mesogastropoda, all of which are predominantly marine and/or estuarine in their habitat. The remaining families in the order which also are marine/estuarine will be dealt with in a later part.