HELIX. MOLLUSCA. 59 



spire obtuse ; lip acute. 16 lines in diameter. Inhabits India. 

 D'Argenv. pi. 28, fig. 10. 



H. nemoralis, Lin. Shell subglobular, smooth, diaphanous, with 

 five transversely banded whorls ; aperture roundish, lunated ; 

 outer lip slightly reflected ; inner margin of the lip brown or 

 blackish. 9 or 10 lines in diameter. Inhabits Europe, in hedges 

 and waste places. B Brown's Illust. pi. 39, fig. 1, 2, 3, 7, 9, 10. 

 This species is extremely common, and varies much in colour and markings. The 

 variety with a white lip has been considered by many naturalists as a separate spe- 

 cies, under the name of H. hortensis. 



H. arbustorum, Lin. Shell subumbilicated, somewhat globular, 

 with five transversely wrinkled whorls, and the umbilicus nearly 

 concealed by a white reflected lip ; colour pale gray, mottled with 

 brown in streaks or lines, and a darker band in the middle of the 

 body whorl. 10 lines in diameter. Inhabits Europe. B. 

 Browns Illust. p. 39, fig. 20, 21, 22. 



H. ericetorum, Lin. Shell flattish above, with six wrinkled whorls, 

 which are convex and strongly umbilicated at the base ; colour 

 whitish, or pale yellowish-brown, with a purplish-brown band on 

 the upper part of the body whorl. 8 lines in diameter. Inha- 

 bits Europe, in heaths and dry places. B. Brown's Illust. pi. 39, 

 fig. 21, 22, 23. 



H. nitida, Drap. Shell orbicular, slightly convex, umbilicated, thin, 

 glossy, pellucid, pale yellowish horn-colour ; lip simple, acute ; 

 animal gray or whitish. 5 lines in diameter. Inhabits Europe, 

 under stones and hedges. B Brown's Illust. pi. 40, fig. 59, 60. 



H.fcetida. (H. nitida, Lam. H. alliaria, Miller.) Shell orbicu- 

 lar, depressed, slightly convex, thin, shining, and pellucid ; co- 

 lour bottle-green, and the animal black. Smaller than the pre- 

 ceding. B. Brown's Illust. pi. 40, fig. 48, 52. 



This species has been confounded with others similar, under the names of H. lu~ 

 cida, miens, nitida, &c. ; but is at once distinguished from all its congeners by the 

 greenish horn-colour of the shell, and its extremely fetid smell when recent. It is 

 usually found, too, in a different locality, the specimens we have gathered being ge- 

 nerally got in moist mossy banks, amongst hypni and jungermanniEe, rarely un- 

 der stones. 



ORDER IV GASTEROPODA. 



Animals with the body straight, never spiral, nor enveloped in 

 a shell which can wholly contain it, with a foot or muscular 

 disk under the belly, joined to the body in nearly its whole 

 length, and serving for locomotion. 



Some of the animals of this division are naked, or without any species of shelly 

 covering ; others have a dorsal plate ; and a third group have a shell more or less 

 concealed in their mantle. M. Cuvier has given the name of Gasteropoda to all the 

 animals of this class which have a foot or muscular disk proper for crawling, whether 

 this foot extends the whole length of the lower surface of the body, or adheres only 

 to the base of the neck ; but M. Lamarck limits the term to those which have 

 the body straight, never spirally convoluted, and which have a muscular disk or foot 



