54 LAND AND FRESH WATER MOLLUSKS 



The most common of the minute species in Alaska ; often found in 

 numbers under bits of cast-off leather and chips near the tops of 

 beaches. The Kamchatkan specimens are beyond suspicion. 



Genus Sphyradium Charpentier. 



Sphyradium edentulum Draparnaud. 



Pupa edentula DRAPARNAUD, Hist. Moll., p. 59, pi. in, figs. 28, 29, 1805. 

 Pupa simplex GOULD, Boston Journ. Nat. Hist., in, p. 403, pi. in, fig. 21, 



1840; Inv. Mass., p. 190, fig. 121, 1841. 

 Vertigo simplex STIMPSON, Shells of N. Engl., p. 53, 1854. MORSE, Am. 



Nat., i, p. 670, figs. 67, 68, 1868. BINNEY, Man. Am. Landsh., p. 191, 



fig. 195, 1885. 

 Pupa alticola INGERSOLL, Bull. U. S. Geol. Geogr. Survey of the Terr., No. 



2, p. 128, 1875 ; ed. II, p. 391, fig., 1876. BINNEY, Man. Am. Landsh., 



p. 174, fig. 166, 1885. 

 Pupa columella "BENSON," var. gredleri CLESSIN, from Alaska, is probably 



S. edentulum. 



Range. Northern Europe, Asia and America. 



Canada ; heights of 8,000 to 9,000 feet 

 in the Rocky Mountains, Colorado ! Un- 

 gava Bay, Labrador ! Laggan, Alberta ; 

 Vancouver Island at Comox, Nanaimo and 

 Victoria ; Kukak Bay, Peninsula of Alaska ! 

 Popof Island ! Shumagin Islands ; Rooluk 

 Island near Unalga Pass, Aleutians ! Port 



FIG 37. Sphyradium eden- Qar Alagka , p e t r opavlovsk ! Kam- 



titlum (magnified). 



chatka (Dall). 



This species has a wide distribution and considerable synonymy. 



UNIDENTIFIED SPECIES. 



The following Helicidce are incertce sedis. 



Helix rudis J. de C. Sowerby in Richardson, Fauna Bor. Am., 

 in, app., p. 315, 1836. Nude name. 



" Lake Superior, Winnipeg and Saskatchewan River." 



Helix attenuata J. de C. Sowerby, op. cit., p. 315, 1836. Nude 

 name. 



" Lake Superior, Winnipeg, and Saskatchewan River." 



Helix belcheri Pfeiffer, P. Z. S. London, for 1845, p. 128; Mon. 

 Helic. Viv., i, p. 104; Reeve, Conch. Icon., Mon. Helix, pi. 190, 

 fig. 1328. 



This species, supposed to have been collected by Capt. Belcher, 

 during his voyage to the Northwest Coast of America, has not been 

 recognized from that quarter since ; and probably, like many other 



