190 



POPULAR CONCHOLOCxY. 



globular form. Natives of the West Indian Islands, the 

 Sandwich Islands, Senegal, and the Red Sea. 



Family 5. — LIMNJEA CEA. 



The body of the animal can be withdrawn entirely into 

 a spiral-formed shell, which has always a sharp-edged 

 outer lip, and the aperture modified by the last whorl 

 but one ; the feelers of the animal are of various forms, 

 but are only two in number, with the eyes at the base ; 

 no operculum. — Living in fresh waters. 



Chilina. Gray. (Dombeya D'Orb.; Potamophila 

 Swain.) — Shell thin, ovate ; spire acute ; 

 aperture oval, longer than wide, and entire 

 at the base ; outer lip thin and simple ; co- 

 lumella solid and sharply plaited.* Animal , 

 with two entire, short, flat, angular feelers, 

 in the middle of which the eyes are placed; 

 two strong, side appendages to the mouth; 

 the opening to the breathing hole has on the 

 right a very long canal projecting forward, 

 which lies in the hinder angle of the aper- 

 ture of the shell. — 13 species, f 



Found in the rivers of La Plata and South America. 



Limn^a. Lam. — Shell oval, inflated, thin, 

 almost horny ; spire small and pointed ; aper- 

 ture oblong, sometimes very large ; occasionally 

 a fold on the columella lip ; no operculum. 

 Animal, with a broad head and snout ; tentacula 

 two, triangular, rather short, broad, the eyes 

 placed at their inner bases : mantle even edged, unmaa mg- 



* Reeve's Iconica. 



t Sowerby. 



