FAMILY 



Vertigo bolltsiana var. arthuri VON MARTENS, Sitz-ber. Gs. Naturf. Fr. zu 

 Berlin, 1882, No. 9, p. 140. 



Range. Northern United States east of the Rocky Mountains and 

 northward. 



Ottawa, Ontario ; Manitoba ; Upper Missouri at Fort Berthold ; 

 Helena, Montana. 



The variety arthuri is catalogued from Arctic America by an over- 

 sight, in Binney's Third Supplement, p. 185. It is really from the 

 Little Missouri in Dakota. 



Vertigo ventricosa Morse. 



Isthmia ventricosa MORSE, Ann. N. Y. Lye. N. Hist., vin, p. I, figs. 1-3, 1865. 

 Vertigo ventricosa MORSE, Am. Nat., i, p. 966, 



figs. 61, 62, 1868. 

 Vertigo ventricosa elatior STERKI, Nautilus, xi, 



p. 120, Feb., 1898. 

 Vertigo gouldii lagganensis PiLSBRY, Proc. 



Acad. Nat. Sci. Phila , for 1899, p. 314, 



fig. i. 

 Vertigo approximans STERJCI, fide Pilsbry. 



Range. Quebec and Maine to Illinois 



and Alberta , Manitoba : variety elatior at 



J FIG. 19. Vertigo ventricosa 



Laggan, Alberta. 



(magnified). 



Vertigo binneyana Sterki. 



Vertigo binneyana STERKI, Proc. Acad. Nat. Sci. Phila., for 1890, p. 33 ; 

 Nautilus, in, p. 125, March, 1890. PILSBRY, Proc. Acad. Nat Sci. 

 Phila., for 1899, p. 315, fig. 2 ; Nautilus, iv, p. 39, pi. I, fig. i, Aug., 

 1890. 



Range. Rocky Mountain region from Albuquerque, New Mexico, 

 to Manitoba. 



Seattle, Wash. ; Helena, Montana ; Winnipeg, Manitoba. 



2O 21 22 



FIGS. 20-22. Vertigo ovata, showing variations in teeth (see next page). 



