126 



GASTEOPODA. 



Otina (Gray). Sliell minute, ear-shaped. Animal 

 with the mantle simple, and short tentacles. 



0. Otis. Fig. 196 ; f 



Lamellaria (Montagu). Shell thin, pellucid; 

 aperture very wide ; no operculum. Animal with 

 a very large mantle, quite concealing the shell, 

 notched in front. 



L. perspicua. Fig. 197 ; n. s. 

 tentaculata. 



193 



197 



19G 



198 



Natica (Lamk.). Shell thick, solid, polished; 

 umbilicus large ; operculum sub-spiral. Animal 

 without eyes ; a large veil, uniting the tentacles ; 

 foot very large, with a fold in front, turned back 

 over the head, and a great lobe behind, partly 

 covering the shell ; tongue short ; gill single. 



