FAMILY ZONITID^ 37 



Range. — Greenland. 



This species is more like the V. beryllina of Europe than the 

 American species. The latest data given by Posselt 

 indicate that it is not found in Iceland. Binney has 

 given an enlarged illustration of this species (fig. 25) 

 in his Land and Fresh Water Shells of North America, fig. 25. Vit- 

 I, p. 28. rinaangeltcce,\. 



Vitrina limpida Gould. 



Vitrina pellucida De Kay, Zool. N. Y. Moll., p. 25, pi. in, fig. 42, 1843; 



not of Miiller, 1774. 

 Viirina limpida GovLO, in Agassiz, Lake Superior, p. 243, 1850. — Morse, 



Journ. Portland Soc. Nat. His., i, p. 11, pi. v, fig. 17, 1864. — Bixney, 



Land and Fw. Sh. N. Am., i, p. 27, figs. 23, 24, 1869. 

 Vitrina americana Pfeiffer, Proc. Zool. Soc. Lond., for 1852, p. 156; 



Conch. Cab., ed. 11, Vitrina, p. 9, pi. i, figs. 22-25, ^854. 



Range. — Central New York and northw^ard, from 

 Q^ ^T^^ New Brunswick to Alberta and Hudson Bay. 



^ ' Pittsburgh, Pennsylvania. Manitoba at Carberry 



Fig. 26. Vit- and Lake of the Woods ; Red Deer and Laggan in 

 rina limfida ^i^erta ; Moose Factory ! James Bay ; Norway House, 

 Maine), \. • . a 



m damp woods. 



This species has been reported from the Rocky Mountain region by 

 Ingersoll, but I regard his specimens so identified as varieties of V. 

 alaskana. 



Vitrina alaskana Dall, nom. nov. 



Vitrina pfeifferi Newcomb, Proc. Cal. Acad. Sci., 11, p. 92, i86r. — Tryon, 

 Am. Journ. Conch., 11, p. 244, pi. iii, fig. 3, 1866. — Binney, Land and 

 Fw. Sh. N, Am., i, p. 28, fig. 26, 1869. Not V. pfeifferi Deshayes, in 

 Fer., Lima9ons, 1822. 



Range. — New Mexico, Utah, Colorado, central California, all at 

 considerable altitudes, and northward. 



Nanaimo, Vancouver Island, B. C. ; Muir Inlet, Alaska ! St. Paul, 

 Kadiak Island ! Popof and Unga Islands, of the Shumagin group ! 

 Akutan ! Unalga ! Rooluk ! and Unalaska ! of the Aleutian chain ; St. 

 Paul ! and St. George Islands, Bering Sea, Alaska, in tall grass of 

 bluff fifty feet above the sea ! 



This species has been referred to as pellucida ., limpida and exilis^ 

 and when fully grown under favorable conditions the shell may reach 

 10 mm. in major diameter, though most of the specimens as collected 

 are considerably smaller. The shell is translucent, with a marked 

 greenish tinge, and not over three whorls. It is flatter than limpida^ 



