GASTEROPODA. 191 



*Planorbis (Gyraulus) deflectus Say. 



Planorbis deflectus Say, Narrative Long's Exped., 1824, vol. 2, 

 p. 261, pi. 15, fig. 8. " North-west Territory." Gould, Inv. 

 Mass., 1870, p. 494, fig. 745. 



Planorbis virens Adams, Amer. Journ. Sci., 1840, ser. 1, vol. 39, 

 p. 374. 



Me. — Portage Lake. 



Vt. 



Mass. — Winchester; Lynnfield; New Bedford; Cambridge. 



R. L— Valley Falls Pond. 



Conn. — Bantam Lake, Litclifield ; near New Haven. 



*Planorbis (Gyraulus) dilatatus Gould. 



Planorbis dilatatus Gould, Inv. Mass., 1841, p. 210, fig. 140. 

 " Nantucket * * * Hingham, [Mass.]." Gould, Inv. Mass., 1870, 

 p. 498, fig. 748. 



Me. — Harrison. 



Mass. — Magnolia; Duxbury; Plymouth. 



R. I.— Smithfield. 



Conn. — Yantie River, Norwich: Stratford and near New Haven. 



*Planorbis (Gyraulus) parvus Say. 



Planorbis parvus Say, Nich. Encycl., 1817, vol. 2, pi. 1, fig. 5. 

 "Delaware River." Gould, Inv. Mass., 1870, p. 497, fig. 747. 



Planorbis elevatxis C. B. Adams, Boston Journ. Nat. Hist., 1840, 

 vol. 3, p. 327, pi. 3, fig. 16. 



Me. — Barren Brook, Caribou; Portland; Rockland. 



N. H. — Keene. 



Vt. — Burlington. 



Mass. — Revere; Norfolk and Plymouth Counties; Pittsfield. 



R. I.— Cunliff's Pond, Elmville. 



*Planorbis (Armiger) crista (Linne). 



Dall, Harriman Alaska Exped., 1905, vol. 13, p. 96. 



