42 Mr. J. C. Melvill and Mr. Abercrombie on 



PELECYPODA. 



Earn. OSTREID^. 



OSTREA (Linn.). 



O. creniilifera (Sowb.) ^plicata (Chem.). 



O. bicolor (Hanley). 



We give these names as most closely corresponding 

 to the Bombay specimens that have come under our 

 notice, but this family is so widely distributed in all seas, 

 and the similarity of shell sculpture is so close, whilst the 

 shape is so varied, and also frequently encrusted with 

 nullipores, that it is impossible to speak with absolute cer- 

 tainty. 



O. lacerata (Hanley). Eound on stones at low tide, 

 densely clustered, and arranged vertically. 



Fam, Anomiid/E. 



Anomia (Linn.). 



A. Achaeus (Gray). Common. 



A. {Enigma) aenigmatica (Ant.). 



Placuna (Brug). 

 F. placenta (Linn.) 

 Very common. 



Fam. Spondylid.e. 



Spondylus (Linn.). 



/S. riibicundiis (Reeve). 



Si. Nicobariais (Chem.). 



Both species uncommon, and only imperfect specimens 

 obtained. 



Fam. Pectinid^e. 



Pecten (P. Belot). 



P. senatorius (Gmel.). 



P. Bingaporhms (Sowb.). 



This family is very poorly represented, and only worn 

 and small specimens of the above were collected. 



