916 HELIX. 



MuUer says this shell is one line in diameter, rather convex^ 

 brownish above, and of a paler colour below ; it has four 

 whirls with transverse ribs or plaits, of which thirty may be 

 counted on the body-whirl. 



PULCHELLA. 67. Shell umbilicated, rather depressed, 

 with hardly four whirls ; aperture roundish, 

 and the outer lip reflected. 



Helix pulchella. Muller Verm. ii. p. 30. Gmelin, p. 

 3633. 



La petite Striee. Geoffroy, p. 35, No. 6. t. 2. 

 Inhabits woods, under stones in moist places and among moss, 



about Paris ; common. Geoffroy. Frequent in Denmark. 



MuUer. 

 Shell one line in diameter, white, smooth, rather pellucid, flat- 



tish above and somewhat convex beneath ; it has three and 



a half or four whirls, which are minutely striated, but the 



striae are not visible to the naked eye. 



TROCHULUS. 68. Shell sub-umbilicated, somewhat 

 conical, with six glabrous whirls ; aperture 

 sub-lunated, and transversely compressed. 



Helix Trochulus. Muller Verm. ii. p. 79- 



Helix trochiformis. Montagu Test. p. 427. t. 11, f. 9. 

 Maton and Racket, in Lin. Trans, viii. p. 200. 



Trochus terrestris, Var. A. Da Costa Brit. Conch, p. So. 



Trochilus sylvestris, &,c. Lister Anim. Ang. p. 123. 

 Inhabits England, in decayed wood, and among the mhss about 



the roots of trees. Lister, SjC. Decayed wood in Denmark. 



Muller. 

 Shell about an eighth of an inch both in length and breadth, 



thin, pellucid, and of a horn-colour with sometimes a reddish 



tinge ; it has six produced rounded whirls, strongly marked 



by the sutures, and Mr. Montagu says it has much the habit 



of a Trochus, but the lunated aperture forbids it being placed 



in that Genus. 



ACULEATA. 69. Shell umbilicated, somewhat coni- 

 cal, with five transversely striated whirls, and 

 the striae membranaceous and bristly. 



Helix aculeata. Muller Verm. ii. p. 81. Chemnitz, ix. 



part 3. p. 153. 1. 133. f. 1209- Gmelin, p. 3638. 

 Helix spuiulosa. Lightfoot in Phil. Trans. Ixxvi. p. 166. 



