V 
66 HELIX. SNAIL-SHELL. 
Shell horn-color, extremely thin brittle and transparent, 
very much resembling the last, but is of a more regularly 
slender form in consequence of the larger volution not be- 
ing so much larger in proportion to the others, and the 
line of separation runs more obliquely; the aperture is 
also smaller and more oblong ; about a fourth less. 
In the Kennet and Avon Canal, Wiltshire j and the 
Grand Canal, near Dublin, v. v. 
- 54. Helix palustris. Marsh Snail-shell 
Pennant, pi. 89. f. 2. A. B.— Montagu, pi. 1G. f. 10- 
Linn. Trans, viii. pi. 5. f. 8— Donovan, pi. 1/5. f. 1,2- 
Dorset Cat. pi. 18. f. 18. 
Shell brown horn-color, semitransparent, sometimes co¬ 
vered with a greyish or brown skin, oftentimes almost 
black with the inside glossy and dark chocolate brown: 
spires six, tapering to a fine point, rather rounded, wrinkled 
longitudinally, and ofteu crossed with a few faint ridge?: 
aperture oval, nearly half as long as the shell; the inner- 
lip a little reflected, so as to form a slight cavity behind it: 
length more than half an inch $ breadth one third of its 
length. 
Watery places : not common, v. v. 
55. Helix fossaria. Ditch Snail-shell. 
Montagu, pi. 16. f. 9—Linn. Trans, viii.pl. 5. f. 9—95:- 
set Cat. pi. 18. f. 17- 
Shell horn-color, .thin, brittle, transparent, very finely 
striate longitudinally, but rarely with any transverse lines: 
spires five or six, tapering to a fine point, much rounded 
and deeply divided: aperture oval; the inner-lip hardly 
reflected, and no.t forming a cavity behind it. Differs from 
the last, in not being above half the size, in the volutions 
being more tumid and deeply divided, and in the aperture 
being more regularly oval, without the reflexion of the in¬ 
ner-lip. 
Wep and muddy places, v. v. 
56. Helix detrita. Three-handed Snail-shell 
Lister, pi. 108.* i. 1— Montagu, pi. 11. f. Dorset Cat. 
pl. 19.f 26. • 
Shell 
