HELIX. SXAIL-SHELL. 53 



and generally with a greenish cast at the base, with a large 

 and deep perforation : spires five or six, the body volution 

 finely rounded at the margin: aperture crescent-shaped, 

 with the margin thin and not reflecting over the perfora- 

 tion : diameter nearly half an inch, and about two tenths in 

 height. 



Wet woods, and under stones, v. v. 



19. Helix hispida. Bristly Snail-shell. 



Montagu, pi. 23. f. 3 Da Costa, pi. 5, f. 10 Donovan, 

 pi. 151. f. 1 Dorset Cat. pi. 21. f. 10. 



Shell very convex, thin, transparent, finely striate 

 (across, with a small perforation : spires five, rounded, co- 

 vered with fine short hairs which give it a whitish downy 

 cast : aperture roundish crescent-shaped, reflected at the 

 angle near the perforation : diameter a quarter of an inch. 



Shady places, and under stones, v. v. 



20. Helix radiata. Radiated Snaitehell. 



Lister, pi. 1058. f. 1 1 -Montagu, pi. 24. f. 3 Da Costa, 

 pi. 4.f. 15, 16 Dorset Cat. pi. 20. f. 15, 16. 



Shell flattish, a little raised on the upper side and con- 

 vex beneath, chesnut-brown with paler rays from the 

 -centre to the margin, with a very large and deep perfora- 

 tion exhibiting the internal volutions : spires six, well de- 

 fined by the line of separation, crossed with regular close- 

 set fine and rather curved raised lines ; the body volution a 

 little flattened, with a very faint keel-like ridge in conse- 

 quence of the convexity underneath : aperture roundish 

 crescent-shaped, not reflected over the perforation : diame- 

 ter a quarter of an inch, 



Variety, of a greenish-White color, without rays, and se- 

 mitransparent. 



This very beautiful variety has, we believe, hitherto been 

 only found at Dinton, in Buckinghamshire. 



Moist places, and under stones, t?. v. 



21. Helix rotundata. Roujtded Snaxl-shcU. 



Shell quite fiat and level on both sides, dark horn-color 



-with transverse chesnut marks or blotches, which however 



F 3 are 



