MOLLUSCAN SHELLS. 273 



Family: LITTORINLD.E. 

 Littorina scabra, Linn. Backwater, Manaar Island. 



Family: CERITHIIDtE. 



Cerithium armatum, Phil. Trincomalee ; Periya Paar. 



Cerithium citrinum, Sower by. Pearl banks, Gulf of Manaar. 



Cerithium moras, Lamarck. Deep water off Galle. 



Cerithium tuberosum, Fabricius. Off Mutwal Island. 



Cerithium yerburyi, E. A. Smith. S. of Adam's Bridge. 



Cerithium (Vertagus) aluco, Ltnn. S. of Modragam Paar. 



Cerithium (Vertagus) articulatum, Adams and Reeve. N. of Gulf of Manaar. 



Cerithium (Vertagus) fasciatum, Brug., var. martinianum, Pfr. Backwater, 

 Manaar Island ; Galle ; S. of Modragam Paar. 



Cerithium ( Vertagus) kochi, Phil. Pearl banks off Aripu, Gulf of Manaar ; 

 Trincomalee ; Modragam Paar ; Galle. 



Cerithium (Vertagus) obeliscus, Brug. Backwater, Manaar Island ; off Galle. 



Colina selecta, Melvill and Stand en. Galle. 



Potamides (Tympanotomy) fluviatilis, Pot. and Mich.- Muddy Creek, N. of 

 Manaar Island. 



Potamides (Telescopium) fuscum, Schumacher. Trincomalee. 



Pyrazus palustris, Linn. Pearl bank off Aripu ; Trincomalee. 



Family: PLANAXID.E. 

 Planaxis sulcatus, Born. Deep water off Galle ; Trincomalee. 



Family : TURRITELLICE. 

 Turritella carinifera, Lamarck. Trincomalee. 

 Turritella triplicata, Studer. Trincomalee. 



Turritella (Haustator) Candida, Reeve. S. of Adam's Bridge. 



2 N 



