288 CEYLON PEARL OYSTER REPORT. 



Dentalium ebiirneum, 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: OSTBEIDjE, 

 Ostrea cuculata, Born. Back water, Manaar. 



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

 Ostrea (Lopha) hyotis, Linn. Trincomalee. 



Family.: ANOMIIDjE. 

 Anomia achauis, Gray. S. of Adam's Bridge. 



Placuna placenta, Linn. Tampalakam Lake, Trincomalee. 



Family: SPONDYLID^E. 

 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: PECTINLTLE. 

 Pecten flabelloides, Reeve. Modragam Paar. 



Pecten histrionicus, Gmelin. Trincomalee. 



