48 FAUNA OF NEW ENGLAND. 



Cydas oralis Prime, Proc. Boston Soc. Nat. Hist., 1853, vol. 4, 

 p. 276 (won. Ferussac, 1807). "Oswego and Greenwich, N. Y. 



* * * Columbus, 0." 



N. H. — Keene. 

 Vt. — Hartland. 



*Musculium partumeium (Say). 



Cydas partumeia Say, Journ. Acad. Nat. Sci. Phila., 1822, ser. 1, 

 vol. 2, p. 380. " NEAR Germantown, [Pa.]." 



Cydas orbicularia Linsley, Amer. Journ. Sci., 1845, ser. 1, vol. 48, 

 p. 276. 



Cydas coerulea Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, 

 p. 161. 



Sphaerium partumeium Gould, Inv. Mass., 1870, p. 103, fig. 408. 



Me. — Great Pond, Cape Elizabeth; South Newcastle; North 

 Haven. 



N. H. — Keene. 



Mass.— Cambridge; Readville; Revere. 



R. I. — Bailey's Pond, Newport; Nyatt. 



Conn.— Old Mill Hill Brook, Stratford; East Haddam. 



* Musculium securis (Prime). 



Cydas securis Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, 

 p. 160. " Massachusetts." 



Sphaerium securis Gould, Inv. Mass., 1870, p. 107, fig. 413. 



Me. — Aroostook River, Caribou; Scarboro; Saco; Old Orchard. 

 Vt. — Larrabee's Point. 



Mass. — Cambridge; Neponset River, Green Lodge; Concord; 

 East Wareham. 



R. I. — Pawtucket River, below Pontiac; Bailey's Pond, Newport. 



*Musculium securis cardissum (Prime). 



Cydas cardissa Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, 



