MOLLUSCAN SHELLS. 273 



FAMILY: LITTOKINHLE. 

 Littorina scabra, LINN. Backwater, Manaar Island. 



FAMILY: CEEITHIID^E. 



Cerithium armatum, PHIL. Trincomalee ; Periya Paar. 

 Cerithium citrinum, So WERE Y. Pearl banks, Gulf of Manaar. 

 Cerithium moms, LAMARCK. Deep water off Galle. 

 Cerithium tuberosum, FABRICIUS. Off Mutwal Island. 

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

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

 Cerithium (Vertagus) articulatum, ADAMS and EEEVE. 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 STANDEN. Galle. 



Potamides (Tympanotonus) fluviatilis, POT. and MICH. Muddy Creek, N. of 

 Manaar Island. 



Potamides (Telescopium) fuscum, SCHUMACHER. Trincomalee. 

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



FAMILY: PLANAXIDJS. 

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



FAMILY: TUKRITELLID^E. 

 Turritella carinifera, LAMARCK. Trincomalee. 

 Turritella triplicata, STUDER. Trincomalee. 



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



2 N 



