290 CEYLON PEARL OYSTER REPORT. 



Pinna chemnitzi, HANLEY. Trincomalee. 



Pinna famata, HANLEY. .Gulf of Manaar ; Trincomalee ; Palk Bay. 

 Pinna zebuensis, REEVE. Gulf of Manaar ; Trincomalee. 

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



FAMILY: MYTILID.E. 



Mytilus dunkeri, REEVE. Trincomalee. 



Mytilus smaragdinus, 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. 



Lithophagus caudigerus, LAMARCK. Gulf of Manaar ; Trincomalee. 

 Lithophagus gracilis, PHILIPPI. Muttuvaratu Paar. 

 Lithophagus obesus, PHILIPPI. Gulf of Manaar. 

 Crenella (Modiolaria) coenobita, VIELLIOT. Gulf of Manaar. 

 Crenella (Modiolaria) cumingiana, DUNKEK. Gulf of Manaar. 



FAMILY: ARGID^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. 



