VERTIGO. 103 



[Vertigo pusilla] var. godetiana J. Piaget, Mittheil. Naturf. 

 Ges. Bern, Jahrg. 1913 (1914), p. 156. 



Vertigo lilljeborgi West. (Vol. 25, p. 167; vol. 27, p. 218). 



According to Esmark (Skrifter Norske Videnskaps-Akad. i 

 Oslo, 1925, p. 50), Vertigo pachygaster Jensen (Vol. 25, p. 

 182) is only a light-colored shell of V. lilljchorgi, deviating a 

 little in form. 



Vertigo moulinsiana (Dup.) Vol. 25, p. 178. 



Pupa desmoulinsiana JeflEreys, 1855 (Vol. 25, p. 179, line 

 19) and Vertigo moulinsiana Jeffr., Brit. Conch. 1, 1862, p. 

 255 ; V, pi. 15, f . 6, are referable to Vertigo lilljehorgi accord- 

 ing to Kennard and Woodward, Syn. Brit. Non-Marine Moll., 

 1926, p. 123. 



On p. 179, 23d line, the reference to the synonym. '' Pupa 

 laevigata ", is erroneous. The paragraph should read: 

 Vertigo laevigata Kokeil, von Gallenstein, Karntens Land- 

 und Siisswasser-Conchylien, in Jahrb. naturhist. Landes- 

 museums von Kamten, 1852, p. 80. — Pupa laevigata Kokeil, 

 Pfeiffer, Monographia IV, 1859, p. 681. 



Vertigo arctica Wallenb. Vol. 25, p. 189. 



G. Mermod (Revue Suisse de Zoologie, Vol. 33, July, 1926, 

 p. 568-571) examined the type lot of Vertigo " eumicra 

 Bgt." of Clessin (Vol. 26, p. 233), one of which he figured 

 (t.c. p. 570, fig. 7, shell, p. 571, fig. 8, radula). It is a tooth- 

 less form of V. arctica, in his opinion. 



Vertigo zschokkei Butikofer (Vol. 27, p. 219) was also ex- 

 amined and submitted to other authorities. The large form 

 of V. zschokkei is considered a bidentate form of V. arctica 

 (Mermod, t. c, p. 571-576, figs. 9). His figures are copied in 

 my PI. 18, figs. 11, 12. The smaU form of '' F. zscJwkkei " 

 is said to be identical with V. parcedentata Al. Braun. 



Vertigo substriata Jeffr. Vol. 25, p. 172. 



The occurrence of this species in the Netherlands, and its 

 Btatus as a " glacial relict " as supposed by some authors, is 



