HELIX.— Plate XLIX. 



MCLLEH, Verm. ten. et fluv. Hist. vol. ii. p. 94. 



HelLr impretna, Dc Blainville. 

 Hab. Island of Hayti. 



Remarkably distinguished by a deeply impressed furrow 

 behind the lip in the last whorl. 



Species 234. (Mus. Cuming.) 



Helix Pallasiana. Uel. testa unMlicatd, compresao- 

 or/iicutari, diacoidea, nuptnie ot)lif/ui arcitatim riigosu- 

 ilriald, infra rolundald, albidd, ad peripheriamj'uscu- 

 zonatd; gpird obtund; attfraclHus yuiugue ad sex, 

 convexiusculU, ultimo carinalu, rarind versus aper- 

 turani obsokta ; aperturd luiiari-rotuiidald, labro re- 



Jiexo, marginibus approrimalif ; umbilico amplo, pro- 

 funda, pernio. 



Pallas's Helix. Shell umbilicated, compressly orbi- 

 cular, discoid, obliquely arcuatcly rugosely striated at 

 the upper part, rounded beneath, whitish, encircled 

 with a brown zone at the periphery ; spire obtuse ; 

 whorls live to six, rather convex, the last keeled, 

 keel obsolete towanls the aperture ; ap<Tturc lunar- 

 rounded ; lip reflected, margins approximated ; um- 

 bilicus large, deep, open. 



Pfeiffeb, Zeitschrift fiir Malac. 1850, p. 67. 



n.ab. Bermuda. 



The whorls of this species ore characterized by a more 

 than usually discoid tubular form of convolution, around 

 a deep perspective umbilicus. 



