105 



in the same position, in V. pygmcea ; and two in 

 V. sexdentata. 



Found in marshy situations in the neighbourhood of 

 Scarborough : whence we have received specimens 

 from our valuable correspondent Mr. Bean. 



86. VERTIGO heterostropha. Aperture reversed, 7- 

 toothed, with a rib behind the outer lip. 



Vertigo heterostropha. Leach, Mollusc, p. 130. 

 Pupa Vertigo. Drap. p. 61. t. 3.f. 34, 35. 

 Turbo Vertigo. Mont. p. 363. t. 12. f. 6. 



Shell half a line long, pale chestnut-brown, semi- 

 transparent, striolate : spire composed of five much 

 rounded volutions: aperture reversed, somewhat 

 triangular, obliquely truncate, with the per itr erne 

 thin, white and slightly reflected, forming an um- 

 bilicus behind the pillar : behind the outer lip is a 

 longitudinal rib, and two or three transverse pale 

 lines, being the reflection of the internal teeth : 

 teeth two above, and five round the mouth, with 

 sometimes an eighth tooth on the pillar-lip. 



In the woods about Scarborough, not uncommon : 

 whence we have received it from Mr. Bean. 



