GASTEROPODA. 



189 



curved outwardly, and often inwardly toothed ; no oper- 

 culum. Animal, having a head with a probos- 

 ciform muzzle, furnished with two short ten- 

 tacula, with eyes at their base; foot short, 

 narrow, and not divided. — Many species; also 

 fossil. 



Several species are European ; others are 

 found on the banks of rivers in Brazil and 

 Madagascar, and the Indian and American 

 Islands. M. Rang remarks that the animals 

 respire the air, and are found on rocks bordering the sea : 

 he never found them in the water. The name is derived 

 from a fancied resemblance to the ears of some animals ; 

 they are for the most part covered with an epidermis, but 

 some are delicately sculptured. 



Beck has divided them into seven genera, Gray into 

 three. Philippi mentions the following as sub-genera : — 

 Cassidula Fer. ; Carychium Muller ; Melampus (Cono- 

 vulus Lam.) Montf. ; Pythia Gray ; Ophicardelus Beck. 



Pedipes. Adanson. — Shell " sub-globose, longitudinal, 

 thick, striated; spire equal to the aperture in length; 

 aperture subovate ; peretreme sharp, thickened 

 within, modified by the last whorl ; columella 

 with three strong plaits on the inner edge ; outer 

 lip with one fold."* Animal, with the feather- 

 formed tentacula in the middle of the head, the 

 oval eyes at the base ; the foot elliptical, underneath 

 separated into two parts by a deep oblique furrow. — 

 4 species. 



The species much resemble Auricula, but are distin- 

 guished by the size, the thickness of the shell, and the 



* Sowerby's Conch. Manual. 



