TOO HELICID^. 



deeper than in the other shell." The strong smell of 

 garlic which this mollusc occasionally emits should 

 not be relied upon as a test whereby to distinguish it 

 from its allies, for other species of the genus are 

 endowed with the same faculty. 



Van viridula. — Shell greenish-white. This variety has been 

 observed in several localities in England, Scotland, and Ireland, 



3. Z. gla'ber,* Studer. Pl. VII. 



" Body dark bluish-grey, striped like a zebra on each side in 

 front, and irregularly mottled behind ; two narrow and slight 

 parallel grooves run along the neck from the head to the upper 

 lip of the shell ; the surface is more or less wrinkled, and has a 

 few large but indistinct lozenge-shaped markings ; ma?itle very 

 thick and dark at the mouth of the shell, over which its edges 

 are folded ; tentacles, upper pair rather long, and finely granu- 

 lated ; lower pair very short ; eyes small, placed on the upper 

 part, but not at the tips, of the tentacular bulbs ; respiratory 

 orifice round, occupying the centre of the pallial fold ; foot very 

 long and slender ; the sole appears as if separated from the 

 upper part of the foot, being defined by a darker line ; sliitie 

 thin and nearly transparent,"— Gwyn Jeffreys in ' Annals and 

 Magazine of Nat. Hist.' for May, 1870. 



Shell compressed, somewhat convex above, less so beneath, 

 thin, exceedingly glossy, moderately transparent, darkish horn- 

 colour, somewhat clouded with opaque white in the umbilical 

 region ; sculpture consisting of numerous but rather indis- 

 tinctly defined transverse striae which are stronger and slightly 

 puckered at the suture ; epidermis very thin ; whorls 5-5!, 

 gradually increasing, convex, body whorl occupying about half 

 of the shell, flattish beneath and sloping abruptly from above 

 and below towards the periphery, which consequently has a 

 slightly angulated appearance ; spire slightly produced, apex 

 obtuse ; suture well defined, but not deep ; mouth large, form- 

 ing about three-fourths of a circle ; 02iter lip slightly reflected 

 near the pillar ; U7nbilic2is narrow but deep. 



* Smooth. 



