172 HELICID^. 



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 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 stride nor the more rounded 

 whorls which distlng-uish it. 



Dr. Turton refers Montagu's T. Q-dentahis 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 antivertisjo. Drap. Tnhl. Moll. 57. ; Hist. p. 60. t. 3. 

 f. 32, 33. ; Forhes and Hcmleij, B. M. iv. 109. t. 130. f. 7. — 

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

 93. t. 8. t". 10. — Alffia palustris. Jeffreys, Linn. Trans, xvi. 

 360. — Vertigo Moiitagua. Leach, MSS. — Helix septem- 

 dentata. Ferus. Prod. 64. ; Rossm. Icon. x. f. 647. — Pujm 

 vertigo, var. « and y. Hurtm, N. Alp. i. 219. — Pupa octo- 

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

 Pfeiff. D. Moll. i. 71. t. 3. f. 43, 44. — Vertigo anti vertigo. 

 Michaud, M. F. 72. — Ala;a antivertigo. Beck, Ind. 85. 

 — Stomodonta antivertigo. Mermctf, Moll. Pyr. 54. 



