58 MOLLUSCA. TRACHELIPODA. 



A. depressa, Lam. (H. ringens, Lin.) Shell imperforate, white, 

 slightly keeled and convex ; aperture turned upwards, five-tooth- 

 ed j lip strongly reflected, f inch long. Inhabits India Lis- 

 ter, pi. 99, fig. 100. 



Gen. 77. CAROCOLLA, Lam. Helix, Lin. 



Shell orbicular, more or less convex or conoidal above, and the 

 circumference angular and edged ; aperture broader than long, 

 contiguous to the axis of the shell ; right margin subangular, 

 often dentated below. 



C. acutissima, Lam. Shell discoidal, convex on both sides, imper- 

 forate, acutely carinated, yellow ; striae small, oblique, and mi- 

 nutely granulated ; lip reflected and bidentated. 2 inches long. 

 Inhabits Jamaica Lam. vi. 2, 95. 



C. lapicida, Lam. Shell orbicular, depressed above, and convex 

 beneath, widely umbilicated, transversely striated j colour brown- 

 ish ; aperture with a white margin, and the outer lip reflected. 

 7 lines in diameter. Inhabits Europe. B. Brown's Illust. pi. 40, 

 fig. 9, 10, 11. 



Gen. 78. HELIX, Lam. Lin. 



Shell orbicular, convex or conoid, sometimes globular, with the 

 spire slightly elevated ; aperture entire, broader than long, 

 very oblique, contiguous to the axis of the shell, having the 

 margin disunited by the projection of the penult whorl. 



The shells of this genus are all terrestrial, and the species are very numerous. 

 They are generally prettily coloured, thin, almost diaphanous. The animal resem- 

 bles the snail, and has like it four tentacula, of which the two anterior are short, 

 and the two posterior larger, with eyes at the summit. The body is spiral, and the 

 animal respires by an opening on the right side. This opening is contiguous to two 

 others, of which one is the anus, the other appropriated to the organs of generation. 

 The Helices crawl about in damp or rainy weather ; and in dry seasons, as well as in 

 winter, crawl into crevices, shut up their opening by a calcareous and temporary 

 operculum, and remain in a state of torpidity. 



H. pematia, Lin. Shell globose, subumbilicated, whitish, or pale 

 yellow, with three obsolete darker bands on the body whorl ; 

 whorls five, longitudinally wrinkled ; aperture lunated, and the 

 margin slightly reflected. 2 to 3 inches long. Inhabits Europe. 



B Browns Illust. pi. 39, fig. 12, 14. 



This species was formerly bred and fattened in stews for the table by the ancient 

 Romans, and is said to have attained an extraordinary magnitude. At the present 

 day the H. pomatia, as well as other species, are still used as food in many parts of 

 the Continent. This species is said to have been introduced into England about the 

 middle of the sixteenth century, and it is still confined to the southern counties. 



H. aspersa, Lam. (H. hortensis, Penn.) Shell globose, imperfo- 

 rate, brown, with whitish transverse irregular stripes ; margin of 

 the inner lip thickened, white, and reflected. 1 1 inch long. Inha- 

 bits Europe, in gardens and hedges. Very common. B Brown's 

 Illust. pi. 39, fig. 5, 13, 17. 



H. citrina, Lin. Shell orbicular, convex, subumbilicated, smooth, 

 diaphanous, shining, pale yellow, banded with white or black ; 



