'374 VANIKORID^. 



A. conica, Schumacher^ fig. 4, a. Shell, A, conica, fig. 

 4, h, 4, c. 



This genus is like Cochlolepas, but it simply excavates 

 with its foot a superficial cavity in the surface of the shell 

 or stone on which it fixes itself, not forming a shelly 

 plate distinct from the substratum. 



Species of Amalthea. 



australis, Quoy and Gaim. Panamensis, C. B. Adams. 



conica, Schum. 



Fam. VANIKORID.^. 



Lingual dentition — ^. Rostrum moderate ; tentacles 

 elongate, subulate, dilated in the middle ; eyes sessile on 

 the outer bases of the tentacles. Mantle-margin included, 

 simple in front. Foot small, circular, with a dilated, 

 membranous, wing-like expansion on each side, and pro- 

 duced in front into a narrow, strap-shaped, truncated 

 lobe. 



Operculum thin, horny, ovate, nonspiral. 



Shell white, spiral, last whorl large ; aperture entire in 

 front. 



These animals are littoral in their habits, being found 

 adhering to stones at low-water. (Cuming.) In their 

 general appearance the shells resemble those of the Ve- 

 lutinidcB, but the animal is very different. 



Genus VANIKOIIO, Quoy and Gaimard. 



Shell thin, white, spiral, often covered with a velvety 

 epidermis; spire short, whorls few, rounded, irregularly 



