288 CEYLON PEARL OYSTER REPORT. 



Dentalium eburneum, LINN.- Palk Bay. 



Dentalium formosum, ADAMS and REEVE. Off N. end of Manaar Island; S. of 

 Adam's Bridge. 



Dentalium octogonum, LAMARCK. Gulf of Manaar ; S. of Adam's Bridge ; Palk 

 Bay ; Trincomalee ; Welligam Bay. 



Dentalium subtorquatum, FISCHER. S. of Adam's Bridge. 



CLASS: PELECYPODA. 



FAMILY: OSTREID^E. 



Ostrea cuculata, BORN. Back water, Manaar. 



Ostrea (Lopha) crista-galli, LINN. Deep water off Galle ; Trincomalee. 

 Ostrea (Lopha) hyotis, LINN. Trincomalee. 



FAMILY: ANOMIIim 

 Anomia achaeus, GRAY. S. of Adam's Bridge. 



Placuna placenta, LINN. Tampalakam Lake, Trincomalee. 



FAMILY: SPONDYLID^. 

 Plicatula ceylanica, SOWERBY. Gulf of Manaar. 



Spondylus exilis, SOWERBY. Gulf of Manaar ; Trincomalee. 

 Spondylus flabellum, REEVE. Trincomalee. 

 Spondylus imperialis, CHEMNITZ. Deep water off Galle. 

 Spondylus layardi, REEVE. Mutwal Island ; Trincomalee. 



FAMILY: LIMID.E. 

 Lima squamosa, LAMARCK. S. of Cheval ; Galle ; Trincomalee ; Muttuvaratu Paar. 



Lima (Ctenoides) fragilis, GMELIN. Gulf of Manaar. 

 Lima (Ctenoides) scabra, BORN. Gulf of Manaar. 



FAMILY: PECTINID^E. 

 Pecten flabelloides, REEVE. Modragam Paar. 



Pecten histrionicus, GMELIN. Triucomalee. 



