162 EUROPEAN SPECIES OP VERTIGO. 



With teeth somewhat as in V. antivertigo, this species differs 

 by the more oblong shape and sinistral coil. Westerlund 

 gives the length as 1% to 2y 2 mm. ; those I have measured are 

 mainly between 1.9 and 2.1 mm. long; the shortest adult 

 1.6 x 1 mm. 



It is locally distributed in England and Ireland but not 

 in Scotland, according to Jeffreys. 



42a. Vertigo pusilla tumida Westerlund. Shell ventri- 

 cose-ovate, obtuse, the base swollen on the right; brown, stri- 

 atulate ; whorls 4% to 5, convex, the last pale anteriorly, with 

 a very thin callous, the base a little compressed. Aperture 

 broadly, unequally cordate, 4 to 6 toothed: parietal 2 or 1, 

 columellar 2 or 1, palatal 3. Length 1%, diam. 1% mm. 

 Sweden, at Pehrsborg near Ronneby among rotten, damp 

 leaves in a beech wood (type loc.) and Borgholm; Norway, 

 Malmoen ; Denmark, Linaa Vesterskov. ( Westerlund) . 



Vertigo tumida WESTERL., Malak. Blatter xiv, 1867, p. 203.. 

 Pupa tumida WESTERL., Fauna iii, 1887, p. 141 ; Acta Soc.. 

 fauna et flora Fennica xiii, no. 7, p. 71. 



Said to differ from V. pusilla by the smaller, blunt and ven- 

 tricose shell, with different shaped aperture, darker color and 

 smaller umbilical crevice. 



"I am not sure that it is more than a dwarf variety or 

 form of V. pusilla. The two specimens sent by Dr. Wester- 

 lund differ from each other in the number of teeth, one speci- 

 men having 5 and the other 7 teeth. He describes tumida 

 as 6- dentate, and V. pusilla as 6-8 dentate." (Jeffreys, Ann. 

 Mag. N. H. 5th ser., ii, 1878, p. 381). Mr. J. W. Taylor 

 states that Westerlund sent him a specimen labelled Vertigo 

 pusilla Mull. var. tumida West. (Journ. of Conch, v, 357). 



43. VERTIGO COLLINA Westerlund. 



Shell [sinistral] rimate, ovate, striatulate, corneous. Spire 

 subconic, short, rather obtuse. Whorls 5%, somewhat flat, 

 united by a lightly impressed suture, not descending at the 

 aperture, the last whorl a little impressed in the middle in 

 front, strongly sloping below, as viewed from the side. Aper- 

 ture oblique, subcordate, with 2 lamelliform, parallel palatal 



