290 CEYLON PEARL OYSTER REPORT. 



Pinna chemnitzi, Hanley. Trincomalee. 



Pinna fumata, Hanley. Gulf of Manaar ; Trincomalee; Palk Bay. 

 Pinna zebuensis, Reeve. Gulf of Manaar ; Trincomalee. 

 Pinna (Atrina) nigra, Chemnitz. Gulf of Manaar. 



Family: MYTILIDiE. 



Mytilus dunkeri, Reeve. Trincomalee. 



Mytilus sinaragdinus, Chemnitz. Tampalakam, Trincomalee. 



Septifer bilocularis, Linn. Jokkenpiddi Paar. 



Septifer nicobaricus, Chemnitz. Modragam Paar. 



Modiolus barbatus, Linn. Gulf of Manaar ; Palk Bay. 



Modiolus (Volsella) japonicus (Dunker). Gulf of Manaar ; S. of Adam's 

 Bridge, &c. 



This mollusc forms a curious nest of gelatinous threads in which are entangled 

 fragments of shell and grains of sand. These Ceylon specimens are less brightly 

 marked, and the periostracum is darker than in specimens we have seen from Muscat. 



Modiolus metcalfei, Wood. Trincomalee. 



Modiolus tulipa, Lamarck. Aripu ; Cheval Paar ; Muttuvaratu Paar ; Trin- 

 comalee. 



Litbophagus caudigerus, Lamarck. Gulf of Manaar ; Trincomalee. 



Lithophagus gracilis, Philippe Muttuvaratu Paar. 



Lithopbagus obesus, Philippe Gulf of Manaar. 



Crenella (Modiolaria) ccEnobita, Vielliot. Gulf of Manaar. 



Crenella (Modiolaria) cumingiana, Dunkek. -Gulf of Manaar. 



Family : ARCID/E. 

 Area navicularis, Brug. S. of Adam's Bridge ; Aripu ; Gulf of Manaar. 

 Area noe, Linn. S. of Adam's Bridge. 

 Area zebra, Reeve. Trincomalee ; deep water off Galle. 



