GASTEROPODA. 191 



*Planorbis (Gyraulus) deflectus Say. 



Planorhis 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. 



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

 p. 374. 



Me. — Portage Lake. 

 Vt. 



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



R. I.— Valley Falls Pond. 



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



*Planorbis (Gyraulus) dilatatus Gould. 



Planorhis 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. — Yantic River, Norwich : Stratford and near New Haven. 



*Planorbis (Gyraulus) parvus Say. 



Planorhis panus Say, Nich. Encycl., 1817, vol. 2, pi. 1, fig. 5. 

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



Planorhis elevatus 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. 



