'274 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXII. 



Fig. 7. 

 These radulse may all be given the dental formula 1. 1. 1., the figures 

 denoting one central with one lateral on each side. It is interest- 

 ing to notice the difierence in shape of the centrals. 



Uburna has about 40 rows, Nassa about 65 and Purpura about 

 200. These species are all carniyorous. Purpura preys upon 

 other molluscs, boring holes in their shells in order to .get at the 

 contents. * ' / . ' 



Other species in the collection are Sistrum tuberculatum, de Blain, 

 and Purpura- tissoti, Petit ; both belong to the family Muricidce. 



(c) Tcenioglossa (Tatwa=ribbon). 



Examples : Planaxis sulcatus. Born (fig. 8), marine, and Ampularia 

 nux, Eeeve (fig. 9), freshwater, from streams in the ghats. 



Fig. 9. 



