TJie Marine Mollusca of Bombay. 39 



OSCILLA (A. Ad.). 

 O. tornata (A. Ad. MSS. inedit.) sp. nov. 



MONOPTYGMA (Gray). 

 M. fulva (Gray). 



Odostomia (Fleming). 

 O. sp. Not yet worked out. 



TURBONILLA (Leach). 

 T. sp. Four species. 



Pyrgulina (A. Ad.). 

 P. casta (A. Ad.). 

 P. callista (Melvill), sp. nov. 

 P. Three other species, undetermined. 



Fam. Neritid^. 



Nerita (Adanson). 



N. oryzarinn (Recluz). 

 albicilla (Linn.). 

 polita (Linn.). 



Neritina (Lam.). 

 iV^. crepidiilaria (Lam.). 



pidcJiella (Reeve). 

 N. oryzarum is extremely common under stones at half- 

 tide, and is variable both in shape and colouring. Nerita 

 Longii (Recluz), Dombeyi (Recluz) and quadricolor (Gmelin) 

 have all been mentioned as found in Bombay, but out of a 

 large number of specimens we have not been able to set 

 apart any as truly distinct from the oryzarum type. 



Fam. TURBINID^. 



Turbo (Linn). 



T. elegans (Fhi\.) = intercostalis (Phil.). 

 ASTRALIUM (Link.). 



A. stellatum (Gmelin). 

 Both common. 



