CLASSES, ORDERS, ETC. 79 



(c) Animal emitting an alliaceous smell. Shell amber or horn- 

 coloured, thin, upper surface smooth and darker than the lower 

 surface, which is not so white as in the other species ; whorls five, 

 the last not so large in proportion as in H. ccUaria ; spire more 

 raised than in H. ccllaria ; umbilicus moderately large, exposing 

 the second whorl ; mouth narrow, crescent-shaped. Diameter \ 

 inch. Walls, gardens, woods. Slightly more local than H. cellana. 



H. alliariap 



{d) Shell convex above, less convex below and only very 

 slightly marked with white, darkish horn-coloured ; whorls five to 

 five and a half, the body-whorl occupying about one-half of the 

 shell ; spire slightly produced, umbilicus narrow, deep, not dis- 

 closing the penultimate whorl, mouth forming three-fourths of a 

 circle. Diameter §ths inch. Woods and fields. Local. 



H. glabra. 



(<?) Shell subpellucid, dull waxy-coloured above, paler below, 

 clouded with opaque white round the umbilicus ; whorls four to 

 five, marked with irregular placed striae, which are interrupted by 

 the sutures and not continued from whorl to whorl ; spire slightly 

 produced; mouth semilunar; umbilicus very large. Diameter 

 f ths to Yo-ths inch. Under stones and amongst moss on hedge- 

 rows and old walls. Common. H. nitidida.^'^ 



(/) Shell whitish or light horn-coloured, glossy, thin, with 

 numerous transverse circular striae ; whorls four, the body-whorl 

 occupymg nearly one-half of the shell ; spire not much raised ; 

 suture deep, narrow ; mouth roundish, oblique ; umbilicus narrow, 

 deep, disclosing all the internal spire. Diameter y^th to |-th inch. 

 Under stones and decayed leaves in woods and fields. Somewhat 

 local. Id. piira.^'' 



(g) Somewhat like H. piira but more glossy, regularly striated, 

 horn-colour ; whorls four to four and a-half with the stri^ extend- 

 ing from whorl to whorl and not interrupted by the sutures as in 

 H. nitidula ; spire much depressed ; mouth semilunar ; diameter 



^^ V. viridula, greenish-wliite. 



^^ V. Helmii, pearl-white ; v. nifens, much smaller, lighter coloured, las 

 whorl expanded. 



" V. viM'garitacea, pearl white, nearly transparent. 



