216 



VERTIGO. 



Subfamily Vertiginous. 

 VERTIGO Muller. (Vol. XXV, p. 69.) 

 Vertigo hoppii (Moller). Vol. XXV, p. 135. 



L. Soos and H. Schlesch record this form from five places 

 in Greenland: Kangerdluarsuk (61° 53') ; Nisik, Kavssinguak 

 and Ameralik near Godtkaab; and Mudderbugton on Disko 

 Island (69° 45'). They quote Moller 's description, and con- 

 tinue : ' ' Our single specimen 

 (from Kavssinguak, fig. 13a) 

 agrees with, this description 

 except that it has no palatal 

 fold; its columellar lamella 

 is represented by a very low 

 nodule ; its length 2.48, diam. 

 1.47 mm. Already Morch had 

 noted that it looks most allied 

 to Pupa arctica "Wallenb., and 

 a careful comparison with 

 specimens of this latter has 

 shown the accuracy of Morch 's remark, as is shown by fig. 

 13b, the latter differing only by its having a palatal fold (which 

 may be, however, absent), and stronger developed parietal 

 and columellar lamellae. According to Pilsbry, both of them 

 may prove to be merely local races of V. moclesta" (Ann. Mus. 

 Nationalis Hungarici, xxi, 1924, p. 98, fig. 2). 



Vertigo genesii (Gredler). Vol. XXV, p. 204. 



This species and V. parcedentata have been discussed by 

 D. Geyer in Jahres-Berichte und Mittheilungen des Ober- 

 rheinischen Geologischen Vereines, n. F., ii, 1912, p. 106, pi. 7, 

 f . 32-40. V. genesii is a species of wet places, associated only 

 with other hygrophilous snails. V. parcedentata is held to be 

 distinct, and a snail of dry situations. Both vary in teeth, 

 sometimes having as many as four. 



Vertigo parcedentata (Al. Br.). Vol. XXV, p. 207. Mr. 

 B. B. Woodward has called my attention to the fact that 



Fig. 13a. 

 V. hoppii. 



Fig. 13b. 

 V. arctica. 



