FAMILY SPH^ERIID^E I4I 



* Sphaerium primeanum Clessin. 



Sphcerium pri?neanum 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 Borm'a, 

 -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 Ferussac. 



(+ 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. 

 Cydas dubia Say, Nicholson's Encycl., 1st Am. ed., pi. 1, fig. 10, 1817. 

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

 Pisidium virginicum Bourguignat, Amen. Mai., 1, p. 53, 1853. — Prime, 

 Mon. Am. Corbie, p. 61, figs. 6i, 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 

 Fig. 112. Nulato j am j ^ Mission! Lake Superior, near St. 

 omeocyc as j id., in 8 to 12. fathoms (S. I. Smith). 



virginica. & 1 ^ \ 



Corneocyclas (Phymesoda?) idahoensis Roper. 



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



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

 Stewart River, Yukon District, Dawson (jide 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 {Jide Sterki), collected by Daw- 

 son in 1S87. 

 Corneocyclas aequilateralis Prime. 



Pisidium cequilaterale Prime, Boston Journ. Nat. Hist., VI, p. 



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



figs. 65-66, 1865. " 5 ' 



b •> ' J Pisidium 



Range. — Maine to Michigan, northward and westward ^quHate- 

 to Alaska. rale Prime. 



