THE LAND AXD FKESHWATKIl MOLLU8CA OP DOUSET3HIBE. 119 



Shell subclyindrical, slightly glossy. pale yellowish-brown, or horn- 

 colour, irregularly marked, indistinct, extremely. fine and closely set 

 longitudinal striae in the line of growth ; iLhorls*\x. to seven, convex, 

 suture rather deep ; spire short and blunt ; mouth furnished with a 

 tooth on the pillar near the middle, inside tinged with reddish- 

 brown ; outer lip not reflected, with a white exterior rib near the 

 margin ; umbilicus slightly oblique, moderately open, partly sur- 

 rounded by the lower portion of the last whorl. L.0.133. B.0.0. 



Var. 1. bigranata. Shell rather smaller and thicker, and having 

 a tubercular tooth or denticle considerably within the outer lip 

 as well as that on the coluniella. 



Var. 2. albina, Menke. Shell white. 



Hab. Under stones, at the roots of grass and amongst dead 

 leaves. Generally distributed, but not so common as the 

 previous species. Var. I, Lul worth (Gwyn Jeffreys^). Var. 2. 

 Ulwell, near Swanage Q.C.M.P.). 



Genus VII. VERTIGO, Mutter. 



Tentacles two only, scarcely inflated at the summit. Miiller was 

 the first to observe that these little animals had two tentacles 

 instead of the usual four, and on this peculiarity he founded this 

 present genus. 



I. VERTIGO ANTIVERTIGO, Lraparnaud, pi. 10. 



Body short, thick, nearly cylindrical, greyish-black, tinged with 

 slate colour. 



Shell ovate-oblong, thin, glossy, transparent, reddish or yellowish- 

 brown, with very faintly marked, clos'ely set, longitudinal striae; 

 whorls four and a half, ventricose, the last occupying about halt of 

 the shell : suture deep ; spire obtuse ; mouth obliquely oval, con- 

 tracted in the middle of the outer edire, with about seven reddish, 

 deeply-seated teeth, three on the pillar, of which one is usually a 

 small tubercle, one on the pillar lip and three inside the outer lip, 

 which are sublamellar ; outer lip which is whitish, is strengthened 

 by an exterior rib ; outer and inner lip* uninterrupted, forming a 

 complete peristome-, umbilicus open, half encircled by a prominent 

 riuge, by which it is slightly contracted. L.0.065. B.0.04. 



Hab. Under stones and felled timber, on water plants and 

 in marshy places. Wool, near the railway (Kendall). 



2. v. PYGM.EA, Draparnaud, pi. 10. 



British Conch., vol. i., p. 257. 



Body expanded and rounded in front, narrowing insensibly and 

 pointed behind, dark slate-colour. 



