loo Bryant Wai^ker 



Planorbis graciIvKntus Gould. 



Tryon (132, p. 192) and Fischer and Crosse (38, p. 72) consider this 

 distinct from liehmanni, to which it is referred by Binney. 



Pi^ANORBis havane;nsis Pfeiffer. 



Listed from New Orleans, La., as a Segmentina by Pilsbry (85, p. 20) 

 and Hinkley(58, p. 36). 



PLANOKBIS HIRSUTUS Goiild. 



Is considered distinct from albus Miill. by Vanatta (136, p. 55). Dall 

 (32, p. 94) refers it to the so-called albus Miill., but in view of the uncer- 

 tainty as to the proper name to be used for that species, retains Gould's 

 name. Kennard (64, p. 49) considers the American and European species 

 as distinct. 



Planorbis HIRSUTUS bor£;alis Westerlund. 



Plannrhis borcaUs Westerlund, Mai. Bl, XXII, 1875, p. yy. 

 Type locality: Port Clarence, Alaska; Northern Sweden. 



Stated by Dall (32, p. 94) to be "'merely a somewhat delicately sculp- 

 tured mutation." 



Ptanorbis horni Tryon. 



Planorhis horni Tryon, Am. J. of Con., I, 1865, p. 231, pi. 22, fig. 16. 

 Type locality : Fort Simpson, British America. 



Listed as a var. of trivolvis by Pilsbry (95, p. 65). Dall (32, p. 89) 

 states that there is a doubt as to whether the types came from Foij^t Simp- 

 son on the Mackenzie River, or Fort Simpson, British Columbia, but that 

 the figure looks more like the Pacific variety (subcrenatus), which he re- 

 fers to trivolvis. 



Ptanorbis intertextus Sowerby. 



Planorhis inter text us SoAverby, Con. Icon., Planorbis, 1876, Sp. 123, pi. 



14, fig. i23a-b. 

 Type locality : Florida. 



Through the courtesy of Mr. E. A. Smith of the British Museum I 

 have been able to examine one of the cotypes of this species. Both the 

 description and the figure given by Sowerby are quite erroneous and very 

 misleading. It has no resemblance whatever to antrosns, but is undoubt- 

 edly a young shell of one of the many southern mutations of trivolvis. 



Planorbis jenksii Carpenter. 



Planorbis jenksii Ca.rpenter, Central Falls (R. I.) Visitor, Mar. 2, 1871; 



Con. Ex., II, 1887, p. 2. 

 Type locality : Pawtucket, R. I. 



