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 cdentula Draparnaud, Hist. Moll., p. 59, pi. lii, figs. 28, 29, 1805. 

 Pupa simplex Govun, Boston Journ. Nat. Hist., Ill, p. 403, pi. ui, fig. 2i, 



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

 Vertigo .?/;«//e'.r 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 ahicola Ingersoll, Bull. U. S. Gaol. 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 coiumella • ' Benson, ' ' var. grcdkri Clessin, from Alaska, is probably 



5. 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 ! Fort 



I -yi- r'y'' ""«'■ "'- Clarence, Alaska! Petropavlovsk I Kam- 

 tulum (masrnined). ' '■ 



chatka (Dall). 



This species has a wide distribution and considerable synonymy. 



Unidentified Species. 



The following HelicidcB are incertce sedis. 



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

 Ill, app., p. 31 S, 1S36. Nude name. 



" Lake Superior, Winnipeg and Saskatchewan River." 



Helix attemiata J. de C. Sowerby, op. cit.., p. 315, 1S36. Nude 

 name. 



" Lake Superior, Winnipeg, and Saskatchewan River." 



Helix belcheri Pfeiffer, P. Z. S. London, for 1S45, p. 12S; 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 voj'age to the Northwest Coast of America, has not been 

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



