HELIX, 225 



thick, yellowish, minutely speckled with white: tentacles 

 (upper pair) hyaline, thick, nearly cylindrical, with very thick 

 bulbs, which are half the length of those tentacles and nearly 

 round ; lower pair extremely small : foot short, broad, strongly 

 truncate and slightly bilobed in front, having a faint yellowish 

 border on the sides, and ending in a rather short and somewhat 

 rounded tail. 



Shell depressed but slightly convex above and below, rather 

 solid although transparent and glossy, light-grey or white, 

 striate transversely by numerous and very fine, but somewhat 

 irregular and faint, curved lines, which are stronger in the 

 umbilical region, and occasionally marked with a few indistinct 

 spiral hues on the lower part : peripherij rounded in the adult, 

 but slightly and obtusely keeled in the young : epidermis rather 

 thick : ivhorls 3|, compressed towards the periphery, the last 

 exceeding in size the rest of the shell and considerably dilated 

 towards the mouth: sjjire very little raised: suture rather 

 deep : mouth almost circular and trumpet-shaped, but very 

 slightly oblique : outer lip very thick and strongly reflected, 

 forming in the adult a complete peristome, much inflected on 

 both sides: umbilicus rather large, exposing a considerable 

 portion of the whorls and all the internal spire. L. 0-04. 

 B. 0-09. 



Var. costata. Shell much less glossy, and marked trans- 

 versely with curved membranaceous ridges (of which there are 

 about forty on the last whorl), besides numerous intermediate 

 strife. II. costata, Miill. Verm. Hist. pt. ii. p. 31 ; F. & H. iv. 

 pi. cxix. f. 8. 



Habitat : Under stones and logs of wood, as well as 

 in moss and at the roots of grass, in moist situations, 

 from the Moray Firth district to the Channel Isles. 

 The variety is equally diffused, but not so common; 

 and it frequents dry and sandy places, often under loose 

 stones or bricks on old walls. Montagu says that he 

 had often found this variety with the typical form, and 

 he described the former, but with considerable doubt, 

 as a different species, under the name of H. crenella ; 

 Maton and Rackett have made the same remark; the 

 authors of the ^British Mollusca^ state that "both 



