FAMILY SPH^ERIID^E 14! 



* Sphaerium primeanum Clessin. 



Sphcerium primeamim 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 Corneocyclas F^russac. 

 (+ Pisidium C. Pfeiffer.) 



Corneocyclas (Phymesoda) virginica Gmelin. 



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



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



Cyclas dubia SAY, Nicholson's Encycl., 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 Tanana River mouth ! also at 



I T 2 ' Nulato ! and the Mission ! Lake Superior, near St. 

 Corneo cyclas 

 virginica. Ignace Id., in 8 to 13 fathoms (S. I. Smith). 



Corneocyclas (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 {fide Sterki). 



Corneocyclas (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 {fide Sterki), collected by Daw- 

 son in 1887. 



Corneocyclas aequilateralis Prime. 



Pisidium czquilaterale PRIME, Boston Journ. Nat. Hist., vi, p. 

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

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



Pisidium 



Range. Maine to Michigan, northward and westward ceguiiate- 

 to Alaska. rale Prime. 



