NATICID.E. 203 



Genus CORIOCELLA, Blainville. 



? Mantle deeply fissured and bilobed in front, the sur- 

 face depressed and covered with numerous hexagonal 

 tubercles. 



Shell spiral, calcareous, ear-shaped, thin, subopaque ; 

 spire short, whorls rounded, last whorl large; aperture 

 patulous. 



Syn. Sigaretus, Cuvier^ not Lam. Cryptothyra, 

 IMenke. Chelinotus, Swains. 



Ex. C. nigra, Quoy and Gaimard, pi. 21, fig. 5, 5, a. 

 Shell, C. nigra, fig. 5, b. 



The animal figured is very large, and entirely of a black 

 colour; it is a native of the Island of Tonga; a species, 

 of which the animal is also black and the shell very 

 similar, is found in the Philippine Archipelago, and 

 another, C. Ophione, is from Australia and New Zealand. 



Species of Coriocella. 

 nigra, Quoy a>td Gaim. Ophione, Gray. 



Fam. NATICID.E. 



Animal bulky. Tongue short, with seven rows of teeth 

 (3T"3), consisting of a quadrate, broad-based, central 

 tooth, flanked by three laterals on each side. Head small ; 

 tentacles lanceolate, wide apart, united by a veil; eyes 

 usually absent, or very minute and placed beneath the ten- 

 tacular veil. Mantle enclosed. Foot very large and ex- 

 panded, rounded at both ends, much produced in front, 



