98 Bryant Walker 



Planorbis commutatus "Dunker" Sowerby. 



Planorbis commutatus Sowerby, Con. Icon., Planorbis, 1876, Sp. 63, pi. 8, 



fig- 63. 

 Type locality : North America. 



Planorbis corpulkntus Say. 



Is a valid species. See Walker 144, p. 133. The citation of this 

 species from Florida or South Carolina by Melvill (74, p. 167) is no doubt 

 erroneous. Sowerby's figures of this species in the Conchologia Iconica are 

 binneyi Try on. 



Planorbis crista L. 



Planorbis natitileus, Walker, Naut., 1897, X, p. 117; Hanham, Naut., 1897, 



X, 130; Taylor, Naut., 1897, X, p. 139. 

 Planorbis costatus DeTarr and Beecher, Leaflet, Albany, 1878; Baker, 



Naut., 1906, XIX, p. 120. 

 Range : Maine, west to Alberta and Illinois. 



Planorbis cultratus Orbigny. 



Planorbis cultratus Orbigny, Hist. Cuba Moll., 1853, (Fr. ed.) I, p. 196, pi. 



14, figs. 5-8; Pilsbry, Naut., 1889, III, p. 63, pi. I, fig. 1-3. 

 Type locality : Cuba ? 



Listed from Miami, Fla., by Rhoads (113, p. 48) and by Pilsbry from 

 Hidalgo, Tex. (88, p. 63) and by Pilsbry and Ferriss from Devil's River. 

 Val Verde Co., Tex. (106, p. 165). 



Planorbis declivis Sowerby. 



Planorbis declivis Sowerby, Con. Icon., Planorbis, 1876, Sp. 28, pi. 4, 



fig. 29. 

 Type locality: ? 



Von Martens (73, p. 397) thinks that this is probably a form of trivol- 

 vis. The name is pre-occupied by Tate (1870), for a species from Nica- 

 ragua. 



Planorbis deflectus Say. 



Planorbis deflexus Sozverbv, Con. Icon., Planorbis, 1876, Sp. 88. pi. XI, fig. 

 88. 

 Dall (32, p. 94) considers this doubtfully distinct from hirsutus and 

 apparently identical with the European form known as draparnaudi or 

 draparnaldi Shepp. 



Planorbis dilatatus Gould. 



Includes buchanensis Lea according to Tryon (132, p. 209) ; virens and 

 elei'atus according to Vanatta (136, p. 55); and lens^ alahamensis and 

 buchanensis according to Dall (32, p. 92). 



