PELECYPODA. 53. 



Pisidium monas Sterki. 



Sterki, Nautilus, 1901, vol. 14, p. 100. "Mountain Lake, 

 Marquette County, Michigan." 



Me. — Georges River, North Warren. 



Pisidium alleni Sterki. 



Sterki, Nautilus, 1912, vol. 26, p. 9. " New England, New 

 York." 



Me. — Hebron and Buckfield; Franklin Co. 

 N. H. 



Pisidium sphaericum Sterki. 



Sterki, Nautilus, 1912, vol. 26, p. 8. [Westbrook, Me., Saco, 

 Me., and Lynnfield, Mass.] 



Me. — Westbrook; Georges River, North Warren; Saco. 

 Mass. — Dan vers; Lynnfield; Cambridge; Woburn. 



*Pisidium variabile Prime. 



Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, p. 163. " Mas- 

 sachusetts." Prime, Smithson. Misc. Coll., 1865, vol. 7, art. 5, 

 p. 66, figs. 69, 70. Gould, Inv. Mass., 1870, p. 115, figs. 427, 428. 



Me. — Caribou; Mud Lake, Westmanland, Aroostook Co.; 

 Saco; Dover; Ft. Fairfield. 



N. H. 



Mass. — Cambridge; Concord; Rowley; Waltham; Dan vers; 

 Duxbury; Wareham. 



Pisidium variabile cicer Prime. 



Pisidium cicer Prime, Ann. Lye. Nat. Hist. N. Y., 1854, \ol. 

 6, p. 64, pi. 1, fig. 1. " Washington County, N. Y." 



Me. — Georges River, North Warren. 



