HELIX. SNAIL-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. m. 



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 carinated 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 ; 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 conical shape, the flat volutions, and the carinated 

 ridge that winds round their base. It is not uncommon ou 

 the continent, but we believe has only been found as Bri- 

 tish on the mountains of Cumberland and Northumbeiv 

 land. v. m. 



25, Helix spinulosa. Prickly Snail-shell. 



Montagu, pi. U. 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 horn-color, covered 

 with a tough skin which rises into thin flat membrane 

 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 

 rubbed off leaving a smooth surface : aperture narrow 

 crescent-shaped : diameter the tenth of an inch, and about 

 as much high. 



Ou decayed wood, and among moss : very rare. v. v. 



26, Helix 



