172 HELICIDJ2. 



under stones; Suffolk, north of England, Preston, 

 Newcastle. 



Animal blackish grey. 



Shell somewhat smaller than V. pygm&a, 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 surface be- 

 tween the two lips on the upper part of the aperture, 

 the right tooth much the larger. The tip is mostly 

 shining ; mouth slightly margined externally ; peri- 

 stome 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. 6-dentatus to this 

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



79. 6. VERTIGO antivertigo. Marsh Whorl Shell. 

 Shell oval, ventricose, shining, brown ; whorls 

 five ; aperture orbicular lunate ; margins ex- 

 ternally sinuated, with eight unequal teeth, 

 three of which are superior and between the 

 lips of the peristome. (t. 7. f. 85.) 



Pupa antivertigo. Drop. Tabl Moll. 57. ; Hist. p. 60. t. 3. 

 f. 32, 33. ; Forbes and Hartley, B. M. iv. 109. t. 130. f. 7. 

 Vertigo palustris. Turton, Man. 104.; Leach, Moll. Syn. 

 93. t. 8. f. 10. Alaea palustris. Jeffreys, Linn. Trans, xvi. 

 360. Vertigo Montagua. Leach, MSS. Helix septem- 

 dentata. Ferus. Prod. 64. ; Eossm. Icon. x. f. 647. Pupa 

 vertigo, var. a and y. Hartm. N. Alp. \. 219. Pupa octo- 

 dentata. Hartm. N. Alp. i. 219. Vertigo sexdentata. C. 

 Pfeiff. D. Moll. i. 71. t. 3. f. 43, 44. Vertigo antivertigo. 

 Michaud, M. F. 72. Alaea antivertigo. Beck, Ind. 85. 

 Stoinodonta antivertigo. Mermett, Moll. Pyr. 54. 



