VERTIGO. 219 



Vertigo westerlundi n. n. 



Vertigo inermis (Westerlund), Vol. XXV, p. 187, originally 

 described as Pupa inermis, is preoccupied by Pupa inermis 

 Deshayes, 1863, and may be renamed Vertigo westerlundi. 



Vertigo alpestris acheila Serv. PI. 29, fig. 6. 



Vol. XXV, p. 202. Haas (Butllet Inst. Catalana Hist. Nat. 

 (2), iv, 1924, p. 13, pi. 2, f. 8) ranks this as a subspecies of 

 V. alpestris. While some specimens are without a cervical 

 callus (crest), others have the typical development of alpes- 

 tris, together with all transitions. The example figured has 

 the callosity very weakly indicated. At Flix in the Ebre 

 river drift. 



Page 212. 8th line : for V. angustula read V. angustior. 



Vertigo pup^eformis Poll. Vol. XXV, p. 379. First line : 

 in place of "PI. 5, fig. 10" substitute PI. 11, fig. 13. 



Vertigo zschokkei Biitikofer. PL 29, fig. 4. 



Shell very small, ovate, ventricose, distinctly but very finely 

 striate, glossy purplish-brown. Whorls 4 1 / 4-5, strongly con- 

 vex, rapidly and evenly increasing, parted by a deep suture ; 

 the last whorl rounded, occupying fully two-fifths the total 

 length. Aperture depressed, semicircular, little excised by 

 the penult whorl. Outer margin is quite straight, inserting 

 in an obtuse arc. Margins approaching, joined by a weakly 

 developed whitish callus. Deep within the parietal wall is a 

 tooth, wanting in the younger examples. Peristome sharp, 

 not thickened, not expanded, only on the columellar margin 

 slightly reflected. Umbilical crevice rather large. Length 2.5, 

 diam. 1.4 mm. Variation in size rather considerable (Biiti- 

 kofer) . 



Switzerland: a high mountain form of the Engadin. On 

 Giufplan, 2100 meters; spring near Punt Perif ; Champ, long, 

 1950 meters; Lii. On the under side of pieces of rotten wood 

 sunk deep in the moss, half in the water. 



Vertigo zschokkei Buetikofer, Denkschr. Schweizerischen 

 Naturforsch. Ges., Iv, 1920, p. 82, pi. 2. 



