MOLLUSCAN SHELLS. 271 



Family: NEUITIIXE. 

 Nerita ( Thelicostyla) albicilla, Linn. Galle. 

 Nerita polita, Linn. Welligam Bay. 

 Nerita (Thelicostyla) chlorostoma, Lamarck. Triucomalee. 

 Nerita (Pila) plicata, Linn. Tampalakam Lake, Triucomalee. 

 Nerita (Odontostoma) ruraphi, Recluz. Galle. 



Family: IANTHINID.E. 

 Ianthina fragilis, Lamarck. Triucomalee. 



Family : NATICID^E. 



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

 Lake, Triucomalee; oft' Galle. 



Natica autoni, Philippe Tampalakam Lake, Triucomalee. 



Natica dillwyni, Payr. Palk Bay. 



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



Natica queketti, Sowerby. Pearl banks off Aripu, Gulf of Manaar. 



Natica trailli, Reeve. Off Galle. 



Natica zanzibarica, Recluz. Tampalakam Lake, Trincomalee. 



Natica (Eunatica) tela-aranese, 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, G.melin. S. of Adam's Bridge ; Trincomalee. 



Natica (Mamilla) simiae, Deshay'es. Gulf of Manaar. 



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



