DIMYARIA— CYRENIDAE— SPHAERIUM PARTUMEIUM. 949 



Fam. OERIPHASIIDiE. 



Genus CERIPHASIA, Swains. 

 ? CERIPHASIA LIVESOENS, Menke. 

 A numerous species in the Northwestern States, originally described 

 from Lake Erie, New York, by Menke. 



? CERIPHASIA SUBULARE, Lea. 

 From rivers and creeks of Northwestern States ; Detroit River. 



Class CONCHIFERA. 



Order DIMYARIA. 



SuPERFAMILY CORBICULACEA. 

 Family CYRENIM]. 



Genus SPHAERIUM, Scopoli. 



SPHAERIUM PARTUMEIUM varietas, Say. 



Cyclas partumeia, Say, Jour. Acad. Nat. Sci. Phila., ii, 1S22, 380. 

 Gyclas cornea, var. 2, Lamarck, An. sans Vert., v, 1818, 558. 

 Cyclas orbicularia, Bareatt, Am. Jour., xlviii, 1815, 27(5. 

 Cyclas mirabilis, Prime, Proc. Bost. Soc. Nat. Hist., iv, 1851, 157. 

 Cyclas ccerulca, Prime, loc. sub cit., iv, 1851, 161. 

 Cyclas cburnea, Anthony, loc. sub cit, iv, 1852, 279. 



Sphccrium partumeium, Prime, Mou. Am. Corbiculadae, Smitbson, Miscel. Pub., No. 145, 

 18G5, 45. 



The specimens collected by the expedition were submitted to Mr. Tem- 

 ple Prime, of New York, who has kindly furnished the following notes : — 



" This is a very interesting variety, forming, as it were, the connecting 



link between S. partumeium, of the east, and S. lenticula, Gould, of the 



west coast. It offers many points of resemblance with partumeium var. 



jayanum, from the East; it is, however, more transverse than this variety. 



" Temple Prime. 

 "May, 1875." 



Note. — Since the above was written, the specimens have been re-ex- 

 amined by Dr. Lewis, who states his belief that the species above indicated 

 is S. truncatum Linsby. 



