FAMILY SPH^ERIID^E 



135 



Creek and Fort Pelly, Manitoba ; Lower Saskatchewan River at 

 Grand Rapids ! 



FIG. 97. Sp&terium simile Say. 



This species is the Cyclas saratogea of Lamarck and has numerous 

 other synonyms. It is the largest species of the group in North 

 America, but, judging by the records, rather irregularly distributed. 

 The Lamarckian locality is Lake George ; Say's specimens are from 

 the vicinity of Philadelphia. 



Sphaerium striatinum Lamarck. 



Cyclas striatina LAMARCK, Anim. s. Vert., v, p. 560, 1818. 

 Sphcerium striatinum PRIME, Mon. Am. Corbie, p. 37, fig. 29, 1865. 



Range. North America generally, east of the Sierra Nevada 

 Mountains, from Alabama to the Upper Mackenzie. 



Hell Gate River (Columbia drainage) , Montana ; 

 Humboldt River, Nevada (Hepburn) ; in Manitoba 

 at Lake Winnipeg ; Great Playgreen Lake ; York 

 Factory, Keewatin ; Pasqua Lake, Assiniboia ! 

 Saskatchewan River at Grand Rapids ! Mackenzie 

 River at old Fort Simpson ! 



So far as the records indicate, the place of this FlG> 9S ' s * kt *~ 



. num striatinum. 



species is east of the Rockies, but in at least two 

 places it has been transferred to the head-waters of streams flowing 

 westward. In the East it is perhaps the most common of the Sphceria, 

 taking much such a place as S. corneum does in the European fauna. 



* Sphaerium aureum Prime. 



Cyclasaiirea PRIME, Proc. Boston Soc. Nat. Hist., iv, p. 159, 1851. 

 Sphcerium aureum PRIME, Mon. Am. Corbie, p. 35, fig. 26, 1865. 



Range. Lake Superior. 



It is probable that this species crosses the line into 

 Canada, though not yet searched for in that region. 



Sphaerium walked Sterki. 



Sphcerium ivalkeri STERKI, Nautilus, xiv, p. 142, April, 1901. aureum. 



