FAMILY SPH^RIID^ I4I 



* Sphaerium primeanum Clcssin. 



Spharium primeanum Clessin, Malak. Bliilt., xxv, p. 122, pi. v, figs. I, a-b, 

 1878. 



Range. — Portland, Oregon ; Seattle, Wash. 



This species, which has a remarkable resemblance to a Bornia, 

 judging by the figure, is not otherwise known to me, but, if the local- 

 ities given are correct, may also extend to British Columbia. Accord- 

 ing to Roper it closely resembles S. rhomboideurn Say. 



Genus Comeocyclas Ferussac. 

 (+ risidium C. Pfeiffer.) 

 Comeocyclas (Phymesoda) virginica Gmelin. 



Tellina virginica Gmehn. Syst. Nat., vi, p. 3236, 1792 ; based on Lister, 



Conch., pi. CLix, fig. 15, from Virginia. 

 Cyclas diibia Say, Nicholson's Encycl., ist Am. ed., pi. i, fig. 10, 1817. 

 Phymesoda dubia (S.w) Rafinesque, Ann. Gen. Sci. Phys., v, p. 319. 1820. 

 Pisidium virginicum Bourguignat, Amen. Mai., I, p. 53, 1853. — Prime, 



Mon. Am. Corbie, p. 61, figs. 61, 62, 1865. 



Range. — United States, east of the Rocky Moun- 

 tains, northward to British America and Alaska. 



Lake of the Woods ; Manitoba ; Yukon River, Alaska, 



thirty miles below the Tanana River mouth ! also at 



iG. II . ]vJjj]:j(q I and the Mission! Lake Superior, near St. 

 Comeocyclas _, ^ 



viririiiica Ignace Id., in S to 13 fathoms (S. L Smith). 



Comeocyclas (Phymesoda?) idahoensis Roper. 



Pisidium idahoense Roper, Nautilus, iv, p. 85, Dec, 1896. 



Range. — Old Mission, northern Idaho (Hemphill) ; Seattle, Wash. 

 Stewart River, Yukon District, Dawson {Jide Sterki). 



Comeocyclas (Phymesoda) scutellata Sterki. 

 Pisidium scutfUalum Sterki, Nautilus, x, p. 66, Oct., 1890. 



Range. — Lake Michigan to Montana; Lake Patten, Wash., Pine 

 Lake, Mich. ; Orchard Lake, Minn. ; Sheldon, Montana ; Frances 

 Lake, Liard River, Yukon District (^fide Sterki), collected Ijy Daw- 

 son in 1887. 



Comeocyclas aequilateralis Prime. 



P'sidium a:quilaterale Prime, Boston Joum. Nat. Hist., vi, p 

 366, pi. xii, figs. 23-25, 1852; Mon. Am. Corbie, p. 63, 

 figs. 65-66, 1865. '■"";• "3- 



Pisidium 



Range. — Maine to Michigan, northward and westward (gnuHate- 

 to Alaska. raU- Prime. 



