54 FAUNA OF NEW ENGLAND. 



*Pisidiuni ventricosum Prime. 



Prime, Proc. Boston Soc. Nat. Hist., 1851, vol. 4, p. 68. " Mas- 

 sachusetts * * * Fresh Pond, Cambridge." Prime, Smithson. 

 Misc. Coll., 1865, vol. 7, art. 5, p. 72, figs. 79, 80. 



Me. — Barren Brook, Caribou; Ft. Fairfield; Westmanland. 

 Mass. — Fresh Pond, Cambridge; Waltham; Dan vers. 



*Pisidiuin rotundatum Prime. 



Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, p. 164. " Lake 

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

 p. 72, figs. 81, 82. 



Me. — Barren Brook, Woodland, Aroostook Co. ; Rockland. 

 Vt. — Chimney Point, Lake Champlain. 



*Pisidiuin compressum Prime. 



Prime, Proc. Boston Soc. Nat. Hist., 1852, vol. 4, p. 164. " Mas- 

 sachusetts, * * Cambridge." Prime, Smithson. Misc. Coll., 1865, 

 vol. 7, art. 5, p. 64, figs. 67, 68. 



Me. — Barren Brook, Caribou ; Cross Lake, Woodland. 



N. H. — Keene. 



Vt. — Hartland; Chimney Point, Lake Champlain. 



Mass. — Winchester; Woburn; Concord; Dal ton; Dan vers. 



Conn. — Stonington. 



*Pisidiuin contortum Prime, 



Prime, Ann. Lye. Nat. Hist. N. Y., 1854, vol. 6, p. 65, pi. 1, fig. 2. 

 " Pittsfield, Mass.," (Post-Pliocene). 



Me. — Caribou; Mud Lake; Perham and Westmoreland, Aroos- 

 took Co. (Nylander). 



*Pisidiuin mainense Sterki. 



Sterki, Nautilus, 1903, vol. 17, p. 21. 



