FAMILY SPH^RIIDiB I4I 



* Sphaerium primeanum Clessin. 



Sphcerium primeanum Clessin, Malak. Blatt., 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. rhomboideum Say. 



Genus Comeocyclas Ferussac. 

 (+ Pisidium C. Pfeiffer.) 



Comeocyclas (Phymesoda) virginica Gmelin. 



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



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

 Cyclas dubia Say , Nicholson's Elncycl., ist Am. ed., pi. i, fig. 10, 1817. 

 Phymesoda dubia (Say) 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 Xanana River mouth ! also at 



^ ■ * Nulato ! and the Mission ! Lake Superior, near St. 



Lorneocyclas '^ ' 



virginica. Ignace Id., in 8 to 13 fathoms (S. I. 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 scutellatum 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 (^Jide Sterki), collected by Daw- 

 son in 1887. 



Comeocyclas aequilateralis Prime. 



Pisidium aquilaterale Prime, Boston Joum. Nat. Hist., vi, p. 

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

 figs. 65-66, 1865. Fig. 113. 



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

 to Alaska. rale Prime. 



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