103 



Discovered by Mr. Bean, in woods near Scarborough, 

 in Yorkshire ; and lately by Mr. Alder, in various 

 localities of the neighbourhood of Newcastle. 



83. VERTIGO pygmcea. Aperture with five teeth ; 

 one of which is superior and central between the 

 lips of the peritreme : the peritreme acute. 



Vertigo vulgaris. Leach, Mollusc, p. 129. 

 Pupa pygmsea. Drap. p. 60. t. 3.f. 30, 31. 



Shell a line long, dark brown semitransparent : spire, 

 composed of five rounded and nearly smooth 

 volutions : aperture somewhat triangular, with 

 usually five teeth, two on each lip, and a central one 

 on the upper part ; peritreme thin, whitish when 

 the shell is perfect, slightly reflected and forming 

 an umbilicus, with a longitudinal external rib on 

 the outer lip. 



On the dry barren hills about Torquay, plentifully, 

 under stones. 



84. VERTIGO sexdentata. Aperture with six teeth, 

 two of which are superior and placed between the 

 lips of the peritreme. 



