VERTIGO. i6i 



the tips ; by the aid of a lens, two minute black specks are 

 discernible where the lower pair of tentacles would have been 

 placed had they existed ; foot truncate in front, ending in a 

 narrow tail. 



Shell oval, semitransparent, glossy, of a reddish-brown 

 colour, with faint striae in the line of growth, and a few still 

 more indistinct spiral lines ; peiHphejy rounded ; epidermis 

 very thin ; whorls 4I-5, convex, not much swollen, body whorl 

 occupying about half of the shell ; spire short, apex obtuse ; 

 suture well defined; mouth obliquely semi-oval, with a sharp 

 tooth in the centre of the base of the penultimate whorl, one 

 on the pillar and two or three on the inside of the outer lip ; 

 outer lip rather thin, slightly reflected, thickened by a broadish 

 external rib ; iiuier lip somewhat thick ; umbilicus moderately 

 deep, but narrow. 



Inhabits most parts of Great Britain, in dry and 

 elevated situations, at the roots of grass and under 

 stones and timber; it also occurs in marshy places. 

 It is lively and irritable, and crawls along rather 

 rapidly in a jerking manner, carrying its shell in a 

 nearly upright position. 



The much smaller size and narrower shape of the 

 shell of this species will serve to distinguish it from 

 V. Motdinsiana and V. antivertigo ; it differs also from 

 the latter in having only a single tooth on the base of 

 the penultimate whorl. 



Var. pallida. — Shell lighter in colour and thinner. Inhabits 

 marshy places. Wool, Dorsetshire (Daniel), North Devon and 

 Connemara (J. G. J.), B.C. 



4. V. ALPES'TRis,* Alder. Pl. IX. 



" Body light straw-colour ; tentacles and foot longer than in 

 V.pygmcea.^' — B.C.^ v. i. p. 259. 

 Shell shaped like that of V. pygmcea, but somewhat more 



Inhabiting Alpine districts. 



M 



