50 LAND AND FRESH WATER MOLLUSKS 



in Nova Scotia, not Labrador. I have no authentic record of this 

 species north of Lake of the Woods. 



Subgenus Gonyodiscus Fitzinger. 

 Pyramidula striatella Anthony. 



Helix s trill te lla A.tiinoti\, Boston Journ. Nat. Hist., iii, p. 278, pi. ill, fig. 



2, 1840. — Gould, Inv. Mass., p. 178, fig. 112, 1841. 

 Patula striatella Binney, Man. Am. Land Shells, p. 69, figs. 28, 29, 1885. 

 Pynarnidula (^Gonyodiscus) striatella Pilsbry, Class. Cat. Am. Landsh., p. 32, 



1898. 



Range. — Kansas northward to Great Slave Lake and from New 

 England to the Sierra Nevada, and south to Arizona. 



Woods of the Winnipeg basin, Turtle Mt., Lake of the Woods! 

 English River ! Manitoba ; Moose Factory ! James Bay ; Great Slave 

 Lake at Fort Resolution ! in Alberta at Laggan, Red Deer, Olds, 

 and McLeod, west to the Selkirk Range. 



It is difficult to distinguish immature specimens of this species from 

 P. cronkhitei Newc.,but when full grown perfect specimens are com- 

 pared it is seen that striatella is a smaller shell with a proportionately 

 larger umbilicus, it is of a richer brown color, more regularly and 

 elegantly ribbed and more polished or glistening on the surface. The 

 animal of striatella shows no red maculations through the translucent 

 shell when living, such as are seen in P. ruderata. 



Pyramidula cronkhitei Newcomb. 



Helix cronkhitei Vi'e.\iZOU^, Proc. Gal. Acad. Sci., iii, p. 180, 1865. 



Patula cronkhitei Tryon, Am. Journ. Gonch., 11, p. 263, 1866. — Binney, 



Man. Am. Landsh., p. 70, fig. 30, 1885. 

 Pyratnidula striatella cronkhitei \'\-LS-RV.\,C\3.ss. Cat. Am. Landsh., p. 32, 1898. 

 Patula pauper HititiKX (ex parte), Man. Am. Landsh., p. 187, 1885. 



Range. — Nevada and California in the wooded mountain region to 

 6,000 feet ; Klamath Lake and valley, Oregon, and northward. 



British Columbia at Nanaimo ; Lake Lindeman, Yukon Territory ; 

 in Alaska at Sitka ! Chilkat Inlet ! and valley ; Chilkoot Inlet ! and 

 valley ! shores of Yakutat Bay ! English Bay (Merriam) ! and St. 

 Paul, Kadiak Island ! Popof and Unga Islands ! Shumagins ; Chika 

 Rocks! and Akutan Island! Akutan Pass; L^nalaska (Dall, Elliott, 

 Kincaid, Turner) ! 



Mr. Binney observes that this species is larger, of a lighter color, is 

 more coarsely (and I may add more irregularly) striated than P. 

 striatella. It also has when full grown a larger shell and relatively 

 smaller and deeper umbilicus. I am obliged to confess that I am not 

 able to distinguish shells long dead from those of P. ruderata^ which 



