VERTIGO. 265 



proposed the institution of another genus {Alcea) for the 

 reception of those species which have a dextrorsal spire ; 

 but I now consider this generic addition to be quite 

 useless and untenable. 



7. V. angus'tior*, Jeffreys. 



V. angusfior, Jeffr. in Linn. Trans, xvi. p. 361. Pupa Venetzii, F. & H. iv. 

 p.ll2, pi. cxxx. f.9. 



Body short and stumpy, blackish in front and greyish on 

 the sides and underneath ; tubercles indistinct : mantle yellow- 

 ish-grey: tentacles thick, somewhat cylindrical, dusky-grey, 

 considerably diverging from each other ; bulbs scarcely distinct: 

 foot thick and narrow, pale-grey. 



Shell subfusiform or barrel- shaped, narrower in proportion 

 than V.^usilla, rather sohd, but semitransparent, glossy, hght 

 horncolour, strongly, obhquely and rather closely striate in 

 the Hne of growth : periphery compressed and somewhat an- 

 gular: epidermis thin: whorls 4|, rather convex, but com- 

 pressed, gradually increasing in size, the penultimate one a 

 trifle broader than the last, which occupies about two-fifths 

 of the shell, the first or upper whorl smooth and shining: 

 spire rather short, abrupt and blimt at the point : suture rather 

 deep : mouth sub triangular, and very narrow in consequence of 

 the great contraction or sinuosity of the outer edge in the 

 middle as weU as towards the base ; teeth four or five, viz. 

 two on the pillar (the outer one of which is a little in advance 

 of the other), one on the pillar hp, which is sunk deep within 

 the mouth and resembles a strong curved plate more than a 

 tooth, and one thick and prominent tooth inside the outer lip, 

 with rarely a small tubercle by the side of it : outer lip ex- 

 ceedingly thick and scarcely inflected, strengthened outside 

 and inside by a strong rib, which is situate near the rim and is 

 yellowish- white; the inside rib remarkably thick and increasing 

 the contraction of the mouth : inner lip consisting of a shght 

 deposit on the columella : umbilicus very small, narrow and 

 indistinct, being much contracted by a sharp and gibbous keel 

 or crest at the base of the shell. L. 0-06. B. 0-035. 



Habitat : At the roots of grass in marshy ground, 



* Narrowei*. 



