Catai.oguiv RrcEntIvY Described Moelusca 97 



Peaxorhis campaxulatus mixor Dunker. 



Planorbis caiupanulatiis minor Dunker, Con. Cab., 1850, Limnseiden, p. 52, 



pi 9, fig. 10. 

 Type locality not given. 



Plaxorbis campaxulatus rudentis Dall. 



Planorbis canipaniilatiis rudentis Dall, Rep. Harriman Exp., 1905, XIII, 



p. 90. 

 Type locality : Knee Lake, Keewatin, Canada. 



The citations of P. nudtivohns from NeAvfoiindland by Farrar (37, 

 ]). 36), and from Michigan by Walker, prior to 1907, refer to this form 

 and not to Case's species. 



Plaxorbis campaxulatus smithh Baker. 



Planorbis fainpainilafus sniifhji Baker. Naitt., XXV, 1912, p. 118. 

 Type locality : Douglas Lake, Cheboygan Co., Mich. 



Plaxorbis carib_^;us d'Orbigny. 



This name has priority for the species commonly known as tuniidus Pfr. 



Plaxorbis caries Pilsbry and Ferriss. 



Planorbis cams Pilsbry and Ferriss, Pr. A. N. S. P., 1906, p. 164, pi. IX, 



figs. 4-5. 

 Type locality : Canyon of the Pecos River, above High Bridge, Val Verde 

 Co., Texas. 



Plaxorbis cextervili.Exsis Tryon. 



Planorbis ccntcrvillcnsis Tryon, Mon., 1870. p. 210. pi. 7, fig. 7-9. 

 Type locality : Centerville, Cal. 



Is a form of opcrcularis according to Dall (32, p. 92). 



Plaxorius circumstriatus Tryon. 



Planorbis circjinistriafiis Tryon, Am. J. of Con., II, 1866, p. 113. pi. 10, 



figs. 6-8. 

 Type locality : Weatogue, Conn. 



As identified by Sterki, this species is certainly distinct from P. parvus 

 Say. It ranges from Connecticut to Colorado. 



Planorbis rf)ARCTATus Sowerby. 



Planorbis coarctatns Sowerby. Con. Icon., Planorbis, 1876, Sp. 21, pi. 3, 



fig. 21 a-b. 

 Type locality : ? 



This is apparently an immature campannlatus. 



