PELECYPODA. 51 



*Pisidiuin abditum Haldeman. 



Haldeman, Proc. Acad. Nat. Sci. Phila., 1841, vol. 1, p. 53. 

 " Lancaster Co. Pennsylvania." Gould, Inv. Mass., 1870, 

 p. 113, figs. 425, 426. 



Cyclas minor C. B. Adams, Proc. Boston Soc. Nat. Hist., 1844, 

 vol. 1, p. 48. 



Me. — Woodland; Bethel; Dennysville; Saco; Old Orchard; 

 Ft. Fairfield. 



N. H. — Keene. 



Vt. — Weybridge. 



Mass. — Cambridge; Stow; Revere; Danvers; Dalton; Dux- 

 bmy. 



R. I. 



Conn. 



Pisidium inornatum Sterki. 



Sterki, Nautilus, 1911, vol. 25, p. 3. " swampy land, Roanoke, 

 Randolph Co., Ala." 



Mass. — Duxbury. 



*Pisidium aequilaterale (Prime). 



Prime, Boston Journ. Nat. Hist., 1852, vol. 6, p. 366, pi. 12, 

 figs. 23-25. "Augusta, Me." Prime, Smithson. Misc. Coll., 

 1865, vol. 7, art. 5, p. 63, figs. 65, 66. 



Me. — Portage Lake; Little Madawaska River; Sebec Lake; 

 Orono ; Saco. 

 N. H. — Keene. 



Mass. — Winchester; Waltham; Newton Upper Falls; Danvers. 

 Conn. 



*Pisidiuin ferrugineum Prime. 



Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, p. 162. "Sa- 

 lem * * * Cambridge, [Massachusetts]." Prime, Smithson. Misc. 

 Coll., 1865, vol. 7, art. 5, p. 71, figs. 77, 78. 



