FAMILY ACHATINID^S 33 



Vertigo (Vertilla) milium Pilsbry, Proc. Acad. Nat. Sci. Phila., for 1900, p. 597. 



Range. — New England to Texas and Florida, 

 west to Minnesota. Ontario, Canada. 



This minute species doubtless exists on the northern 

 side of the boundary, though not yet reported 

 there. Fig. 24. Verti- 



go milium (mag- 



* Vertigo (Isthmia) pygmaea Draparnaud. nified). 



Pupa pygmcea Draparnaud, Tableau, p. 57, 1801 ; Hist. Moll. Terr., p. 60, 



pi. in, figs. 20-21, 1805. 

 Vertigo pygmcea Pilsbry, Proc. Acad. Nat. Sci. Phila., for 1900, p. 608. 

 Vertigo callosa Sterki, not Reuss, and/ 5 , superioris Pilsbry, fide Pilsbry, 1. c. 



Range. — Europe, Asia Minor, the Caucasus; America, in the 

 northeastern States and the Lake Superior region. 



Family ACHATINIDjE. 



Genus Cochlicopa (Ferussac) Risso. 



Cochlicopa lubrica Muller. 



Helix lubrica Muller, Verm. Hist., 1, p. 104, 1774. 



Zua lubrica Leach, Syn. Moll. Gt. Brit., p. 114, 1852; Gray's Turton's 



Man., p. 188, pi. vi, fig. 65, 1840. 

 Cionella lubrica Jeffreys, Trans. Linn. Soc, xvi, p. 347, 1830. — Binney, 



Land and Fw. Sh. N. Am., 1, p. 224, figs. 381-385. 

 Bulimus lubricoides Stimpson, Shells of New England, p. 54, 185 1. 

 Zua lubricoidea Morse, Jour. Portland Soc. Nat. Hist., 1, p. 30, figs. 79, 81, 



84; pi. x, fig. 82, 1864; Am. Nat., i, r p. 607, fig. 49, 1868. 

 Ferussacia subcylindrica auct. non L. 



Range. — Europe, North Africa and Asia Minor: Siberia; Kam- 

 chatka ; most of North America. 



Lake Superior region ; Red River of the North, Lake of the Woods 

 and Turtle Mountain, Manitoba ; Moose Factory ! English River, 

 Keewatin ; Laggan and Red Deer in Alberta ; Nanaimo and Victoria, 

 British Columbia ; Point Barrow ! and Yukon valley, Alaska ; Avacha 

 Bay ! Kamchatka. 



This well known shell is one of the most emphatically circumpolar 

 species in existence, and considering its immense geographical and 

 climatic range its resistance to the factors which make for variation is 

 very remarkable. 



Family CIRCINARIIDiE. 

 Genus Circinaria Beck. 



This is Macrocyclis or Selenites of recent literature, not of Beck 

 or Hope. 



