HELIX. SNATL-SHELL. 
55 
shaped, the pillar-lip a little reflected over the perfora¬ 
tion : diameter about the tenth of an inch ; nearly as much 
high, 
• On decayed wood : very rare. v. in. 
24. Helix elegans. Elegant Snail-shell. 
Gmelin, p. 3642— Lister, pi. 61. f. 68 . 
Trochus terrestris. Pennant , pi. 83. f. 5— Donovan 
pi. 111 . 
Shell thin, conic but rather obtuse at the top, finely 
striate longitudinally: spires five or six, flattish, divided 
by a fine depressed line, and marked with a prominent 
ridge round the base of each: color livid white, with some¬ 
times a brown line round the middle of the volutions ; the 
base flattened, with a strong carinoted edge round it, and 
striate in a radiate manner from the centre: aperture much 
compressed, with a small perforation behind the pillar: 
diameter more than a quarter of an inch 5 height not quite 
so much. 
This species has a much greater resemblance to a Tro¬ 
chus than the last, from which it is distinguished by its 
more couical shape, the flat volutions, and the carinated 
ridge that winds round their base. It is not uncommon on 
the continent, but we believe has only been found as Bri¬ 
tish on the mountains of Cumberland and Northumber¬ 
land. v. m. 
25. Helix spinulosa. Prichly Snail-shell. 
Montagu, pi. 11. f. 10— Dorset Cat. pi. 19. f. 23. 
Shell produced at top, thin, semitransparent, with a 
small perforation: spires five, * rounded and distinctly di¬ 
vided by the line of separation, brown hom-color, covered 
with a tough skin which rises into thin flat membrana¬ 
ceous bristly striate folds or processes, especially round 
the middle of each volution, giving it the appearance of 
being ridged with small spines, and which may be easily 
nibbed off leaving a smooth surface: aperture narrow 
crescent-shaped : diameter the tenth of an inch, and about 
as much high. 
On decayed wood, and among moss : very rare. v. v. 
. ' 26. Helix 
