CONCHOLOGY. 99 
FAMILY VII. 
Cotmmacea. Eleven genera. 
1. Genus Helix. Pl. X. 
Animal. Of a slightly variable form, the mantle forming at its 
free edge a kind of ring or thick collar, especially in front, and 
faintly divided into two lips; foot oval, plane, smooth beneath, 
inflated and granular below, joined to the visceral club by a nar- 
row peduncle ; head sufficiently distinct ; anterior tentacula very 
evident and inflated at top, the posterior very long; the mouth a 
vertical cleft provided with two labial lobes, a sort of marginal 
tooth, with a small, oval, lingual club. 
Shell. The name Helix was given to this genus from the 
spiral shape of the shell, which varies much in form, but generally 
globular, and ventricose, conoid but never turriculated ; summit 
generally obtuse, aperture varying much in size, sometimes very 
large, sometimes small, always regulated by the turn of the spire ; 
oval, semilunar, more wide than long, edges disunited, entering 
little into the interior ; right lip or margin thickened or reflected 
inwards. Inhabits the groves and woods both of America and 
Europe. Two hundred and three species. 
Helix vesicalis. Helix cepa. 
H. gigantea. H. heteroclites. 
H. polyzonalis. H. discolor. 
H. monozonalis. H. lactea. 
H. pulla. H. zonaria. 
H. lIineolata. A. guttata. 
H. mutata. H. Madagascarensis. 
H. pomatia. H. Javanica. 
H. aspersa. H. Peruviana. 
H. vermiculata. H. simplex, 
H. Alonensis. H. cidaris. 
H. vesicolor. H. citrina. 
H, naticoides. H. algira. 
H. picta. H. verticellus. 
H. galactites. H. olivetorum. 
