40 Mr. J. C. Melvill and Mr. xA^bercrombie on 



Fam. TROCHlDyE. 



Trochus (Linn). 



T. {Polydonta, Schum.) radiatiis (Gmelin). 



Clanculus (Mont). 



C. depictus (A. Ad.) = TrocJms scabrosus (Phil.) ? 



We think these two must be forms of one species. White 

 specimens of C. depictus are also not unfrequent, and may 

 be designated as van albidus. 



C. ceylaniais (Nevill). 



ISANDA (H. and A. Ad.). 

 /. crenulifera (A. Ad.). 



ROTELLA (Lam.), = UMBONIUM (Link.). 

 R. vestiaria (Lam.) and var. elegans (Beck). 



GiBBULA (Risso). 

 G. Swainsonii (A. Ad.). 



ZlZYPHlNUS (Gray). 



Z. scobinatus (Adams). Not common. Peculiar to 



Bombay shores. 



EUCHELUS (Phil.). 



E. tricarinatiis (Lam.). 



var. Jiorrida (Phil.). 



Indicus (A. Ad.). 



T. radiatiis is extremely common, and some specimens 



appear to agree very closely with incrassata (Lam.). 



C. depictus and E. Indicus also abound, and the little bright 



coloured R. vestiaria is present in countless millions, in 



many beautifully coloured varieties. 



Fam. Delphinulid/e. 



LlOTiA (Gray). 



L. pulchella (Dunker). Our specimens of this little 



shell agree very closely with Cyclostrema eburneuin 



(Nevill), so far as we can judge from the figure. 



Cyclostrema (Marryat). 

 C. solariellum (Melvill), sp. nov. 

 G. cingulatuni (Dunker). 



