HELIC1DJE. 203 



ing, striated, yellow horn-colour; mouth orbicular 

 lunate, rather sinuated, with two or three plaits 

 on the pillar, and three on the outer lip. 



Turbo sexdentatus. Montagu, T. B. t. 12. f. 

 8. ? ?; Sheppard, Linn. Trans, xiv. ]56. 



Vertigo 4-5-dentata. Studer, Cat. 



similis. Ferussac, Prod. 64, 



Pupa sexdentata. Alder. 



' substriata. Alder, Cat. 



Alaea substriata. Jeffreys, Linn. Trans, xvi. 315. 



Vertigo substriata. Alder, Cat. Supp., and Mag. 

 ZooL fr Bot. ii. 112. 



Vertigo sexdentata. Turton, Man. ed. 1. 1. 7. f. 84. 



pygmsea. Pfeiffer? 



Inhab. marshy places, at the roots of grass, and 

 under stones; Suffolk, north of England, Preston, 

 Newcastle. 



Animal blackish grey. 



Shell somewhat smaller than V. pygmcea, and of a 

 more conical shape, with the volutions (four or five) 

 more rounded and better defined ; and may be 

 readily known by the two distinct teeth on the sur- 

 face between the two lips on the upper part of the 

 aperture, the right tooth much the larger. The tip 

 is mostly shining; mouth slightly margined exter- 

 nally ; peristome thin, reflexed ; perforation small. 



The figure (84.) of the first edition, did not well 

 represent this species, which is the smallest of the 

 tribe ; it has neither the striae nor the more rounded 

 whorls which distinguish it. 



Dr. Turton refers Montagu's T. Q-dentatus to this 

 species, Mr. Jeffreys refers it to V. palustris. 



K6 



