loo Bryant Walker 



Planokbis gracilentus Gould. 



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

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



Planorbis havanEnsis Pfeiffer. 



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

 and Hinkley (58, p. 36). 



Planordis iriRSUTus Gould. 



Is considered distinct from alhus VixxW. by Vanatta (136, p., 55). Dall 

 (32, p. 94) refers it to the so-called alhus 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. 



Peanorbis iiirsutus boreaeis Westerlund. 



Planorbis hnrealis Westerlund, Mai. Bl., XXTI, 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." 



Peanorbis horni Tryon. 



Planorl>is horni Tryon, /\m. J. of Con., 1, 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 Fort Simp- 

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

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

 fers to trivolvis. 



Peanorbis intertextus Sowerby. 



Planorbis intertextus Sowerby, 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 antrosus, but is undoubt- 

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



Peanorbis jenksii Carpenter. 



Planorbis jenksii Carpenter, Central Falls (R. I.) \"isitor, Mar. 2, 1871 ; 



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

 Type locality : Pawtucket, R. I. 



