PELECYPODA. 59 



Me. — Little Mud Lake, Aroostook Co.; Westmanland (Ny- 

 ]ander). 



Mass. — Cambridge; Wobum; Duxbury; Wareham; Westfield. 



*Pisidiuin tenuissimum Sterki. 



Sterki, Nautilus, 1901, vol. 14, p. 99. " Michigan." 

 Me. — Little Mud Lake, Aroostook Co. (subfossU). 



Pisidium noveboracense Prime. 



Prime, Ann. Lye. Nat. Hist. N. Y., 1853, vol. 6, p. 66, pi. 1, fig. 3. 

 " Washington * * * and Herkimer Counties, N. Y." Prime, 

 Smithson. Misc. Coll., 1865, vol. 7, art. 5, p. 67, fig. 71. 



Me. — Buckfield (J. A. Allen); Fogelin's Lake, Aroostook Co. 

 (Nylander). 



*Pisidium streatori Sterki. 



Sterki, Nautilus, 1901, vol. 14, p. 100. " Canaseraga river, 

 N. Y.; Garrettsville, Ohio." 



Me.— Hebron (J. A. Allen). 



Pisidium imbecille Sterki. 



Sterki, Nautilus, 1900, vol. 14, p. 5. " Byer's Trout Pond, and 

 Button Lake, Kent Co., Mich." 



Me. — Aroostook Co. (Nylander). 



Pisidium vesiculare Sterki. 



Sterki, Nautilus, 1896, vol. 10, p. 21. " Grand Rapids, Michi- 

 gan." 



Me. — Aroostook Co. (Nylander). 



