Sterki: North American Sph.eriid.^. 437 



24. Sphaerium jalapense Pilsbry. 



Spharium jalapense Pilsbry, I. c, p. 786; PI. LIII, figs, i, la; PI. LII, fig. i. 

 Ilahitat. — Mexico, Texas. 



25. Sphaerium pilsbryanum Sterki. 



Sphariiim pilsbryanum Sterki, Nautilus, XXII, 1909, p. 141. 



Habitat . — Bear Lake, Utah (originals fossil), recent in Utah Lake. 



26. Sphaerium dentatum (Haldeman). 



Cyclas denlata Haldeman, Proc. Acad. Nat. Set. Philada., 1841, p. 100. 

 Sphcetium dentatum Prime, Mon. Corb., 1865, p. 40. 



The species is not sufficiently well known. 

 Habitat. — Oregon, Washington. 



27. Sphaerium tumidum Baird. 



Sphcerium tutnidum Baird, Proc. Zool. Soc. London, 1863, p. 69. 

 Sphcuriujn lumidnm Prime, Mon. Corb., 1865, p. 43. 



Habitat. — British Columbia, Sumass Prairie, Frazer River. 



28. Sphaerium hendersoni Sterki. 



Sphcerium hendersoni Sterki, Nautilus, XX, 1906, p. 69. 

 Habitat. — Colorado. 



29. Sphaerium spokani Baird. 



Spliarium spolzani Baird, Proc. Zool. Soc. London, 1863, p. 69. 

 Spticerium spokani Prime, Mon. Corb., 1865, p. 44. 



Habitat. — British Columbia, Spokane and Kootenai Rivers. 



30. Sphaerium californicum Clessin. 



Sphcerium californicum Clessin, Malacozool. Blatter, XXV, 1878, p. 123, PI. \^, 

 fig. 2; Monograph Cycladeen in Martini-Chemnitz, 1879, p. 270, PL 41, figs. 

 20 and 21. 



Habitat. — California. 



31. Sphaerium nobile (Gould). 



Cyclas nohilis Gould, Boston Proc, V, 1855, p. 229. 

 Sphcerium nobile Prime, Mon. Corb., 1865, p. 41. 



Habitat. — California and Washington. 



32. Sphaerium primeanum Clessin. 



Sphcerium primeanum Clessin, Malacozool. Blatter, XXV, 1878, p. 122, PI. V, 

 figs, a, h; Monograph Cycladeen, I. c, 1879, p. 122, PL 41, figs. 18, 19. 



Habitat. — Oregon, Washington. 



