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 

 some what irregular and faint, curved lines, which are stronger 

 in the umbilical region, and occasionally marked with a few 

 indistinct spiral lines on the lower part : periphery rounded 

 in the adult, but slightly and obtusely keeled in the young : 

 epidermis rather thick : whorls 3, compressed towards the 

 periphery, the last exceeding in size the rest of the shell 

 and considerably dilated towards the mouth : spire 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 inter- 

 mediate striae. H. costata, Mull. 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' sta.te that "both 



