122 BRITISH MOLLUSKS. 



Hab. Central Europe. West of England and Ireland. Eare. (At the 

 roots of grass in wet places.) 



It will be seen by our figure of this very rare species, that the 

 shell of V. vertigo is distinguished from that of V. pusilla, by a 

 more ovate form peculiarly constricted at the sutures, arising from a 

 characteristic attenuate contraction of the last whorl on reaching 

 maturity. Another peculiarity of the species consists in the un- 

 usual arrangement of the teeth, there being two on the body 

 whorl to only one on the opposite margin. The animal as described 

 by Mr. Jeffreys, who has observed it both in the west of England 

 and in the south of France, is short and rather slow in its move- 

 ments, black in front, and grey at the sides and underneath, with 

 the tentacles thick and considerably diverging from each other. 



The species was well observed by Montagu. It is unfortunate 

 that he gave it a name which had been used by Muller to designate 

 the genus ; but Vertigo vertigo is no more objectionable than Ver- 

 tigo antivertigo, and as conchologists are pretty well agreed on re- 

 taining the latter name in the nomenclature, we may as well do our 

 eminent countryman the justice to retain also the former. 



8. Vertigo edentula. Toothless Vertigo. 



Shell ; small, rather narrowly straightly cylindrical, minu tely um- 

 bilicated, thin, yellowish horny, bright, glossy, 

 whorls six to six and a half, rather flatly con- 

 vex, smooth or faintly arcuately striated ; aper- 

 ture small, pyriformly rounded, toothless, lip 

 thinly reflected. 



Helix exigua, Studer (1789), Faun. Helv. in Code's Trav. 

 Switz. vol. iii. p. 430 (without characters). 



Pupa edentula, Draparnaud (1801), Hist. Moll. p. 52. 

 pi. iii. f. 28, 29. 



Vertigo edentula, Studer (1820), Kurz. Vers. p. 89. 



Vertigo nitida, Ferussac (1822), Tabl. Sgst. p. 68. 



Helix Offtonensis, Sheppard (1823), Trans. Linn. Soc. vol. xiv. p. 155. 



Jaminia edentula, Eisso (1826), Hist. Nat. Hwrop. Merid. vol. iv. p. 89. 



Turbo edentulus, Wood (1828), Ind. Test. Suppl. pi. vi. f. 14. 



AIcbu nitida and revoluta, Jeffreys (1830), Trans. Linn. Soc. vol. svi. p. 358. 



Alcea edentula, Beck (1837), Ind. Moll. p. 85. 



Vertigo lepidula, Held (1837), Isis, p. 307. 



