104 VERTIGO. 



discussed by Dr. A. L. J. Sunier in Zoologische Mededeelingen, 

 Rijks Museum van Nat. Hist., Leiden, IX, 113-178. 



Vertigo genesh Gredler. PI. 18, figs. 13-16. 



The characters and distribution have been discussed by A. 

 W. Stelfox and R. A. Phillips in Journ. of Conch., Vol. 17, 

 July, 1925, p. 236-240, with figures of a topotype from Salten 

 (reproduced in my PI. 18, fig. 14), and of Irish specimens 

 (reproduced in PI. 18, fig. 13, Fancraft marl bed; fig. 15, 

 marl at Golden Grove; fig. 16, marshy pasture near Mount- 

 mellick. Queen's Co., Ireland). 



V. parcedentata Al. Braun, received from Geyer, is said by 

 Stelfox to be " more cylindric and alpestris-shaited " than 

 the Irish shells. 



See also this Manual, Vol. 27, p. 216, and Geyer, Arcliiv fiir 

 Molluskenkunde, Vol. 57, 1925, p. 99-102, where Sandberger's 

 figures of parcedentata are discussed, and a grouping of 

 European dextral Vertigo species is proposed. 



Vertigo genesii geyeri Lindholm. PL 18, fig. 17. 



Shell dextral, minute, rimate, ovate, obtuse, deep brown or 

 chestnut, lightly striatulate, glossy. Whorls 4I/2, convex, the 

 first three slowly, last two rapidly increasing and somewhat 

 swollen, separated by a deep suture which ascends slightly in 

 front. Aperture semioval with the margins nearly straight, 

 the right regularly arcuate or slightly subconstricted, the 

 columellar vertical, dilated and reflected above ; four-toothed, 

 one remote, subcompressed strong parietal, one conic, strong, 

 lamella in the middle of the columella, two unconnected 

 palatals, the larger nodiform or pliciform below the middle of 

 the margin, a very minute denticle above the middle ; palatal 

 and cervical calluses wanting. Alt. 2 mm., diam. 1 mm. 

 {Lindholm). 



WUrttembergischen Allgau; Tirol; Poland and European 

 Russia. Tirol: Salten (D. Geyer). U.S.S.R. : Wlachernskaja, 

 Gouv. Moskau; Ishora R. debris, Gouv. St. Petersburg (Lind- 

 holm) ; shore meadow of Tseheremenstzkoje Lake, Gouv. St. 

 Petersburg (I. K. Wislouch). Fossil in peat-bog of Pfohren 

 near Donaueschingen (D. Geyer). 



