MOLLUSCAN SHELLS. 271 



FAMILY: NERITID^E. 



Nerita (Thelicostyla) albicilla, LINN. Galle. 

 Nerita polita, LINN, Welligam Bay. 

 Nerita (Thelicostyla) chlorostoma, LAMARCK. Trincomalee. 

 Nerita (Pila) plicata, LINN. Tampalakam Lake, Trincomalee. 

 Nerita (Odontostoma) rumphi, EECLUZ. Galle. 



FAMILY: 



lanthina fragilis, LAMARCK. Trincomalee. 



* ' .. f 

 FAMILY: NATICID^E. 



Natica ala-papilionis, CHEMNITZ. Pearl banks, Gulf of Manaar; Tampalakam 

 Lake, Trincomalee ; off Galle. 



Natica antoni, PHILIPPL Tampalakam Lake, Trincomalee. 



Natica dillwyni, PAYR. Palk Bay. 



Natica euzona, RECLUZ. Jokkenpiddi Paar ; Tampalakam Lake, Trincomalee. 



Natica queketti, So WERE Y. Pearl banks off Aripu, Gulf of Manaar. 



Natica trailli, REEVE. Off Galle. 



Natica zanzibarica, RECLUZ. Tampalakam Lake, Trincomalee. 



Natica (Eunatica) tela-araneae, MELVILL. Cheval Paar, Gulf of Manaar. 



Natica (Mamma) albumen, LINN. N. of Gulf of Manaar. 



Natica (Mamma) candidissima, LEGUIL. Gulf of Manaar ; deep water off Galle. 



Natica (Mamma) columnaris, RECLUZ. Deep water off Galle. 



Natica (Mamma) mamilla, LINN. Trincomalee. 



Natica (Mamilla) melanostoma, GMELIN. S. of Adam's Bridge ; Trincomalee. 



Natica (Mamilla) simiae, DESHAYES. Gulf of Manaar. 

 Sigaretus neritoideus, LINN. Pearl banks, Gulf of Manaar. 



