76 POLYGYRA. 



did not include either of the forms Tryon uses the name for ! Aplo- 

 don, Raf., has also been used in this connection ; it is positively uni- 

 dentifiable. 



Species. 



P. tridentata Say, iii, 143. v. obsoleta Pils. 



lunula Raf. P. hopetonensis Shutt. iii, 144. 



v. juxtidens Pils. ephabus Say, ms. 



v. edentilabris Pils. P. vannostrandi Bid., iii, 145. 



P. fraudulenta Pils. P. vultuosa Gld., iii, 144. 



fallax auct., not Say, iii, 143. v. henriettte Maz., iii, 144. 



P. fallax Say. copei Weth., iii, 144. 



iittroferens Bid. iii, 145. v. cragiui Call, iii, 144. 



'T* ^ * 



P. rugeli Shuttlw., iii, 147. P. edentata Samp., viii, 154. 



P. inflecta Say, iii, 146. edentula W. G. B. 



* * * 



P. mullani Bid., iii, 145. P. Columbian a Lea, iii, 154. 

 v. hemphilli W. G. B., iii, 146. v. labiosa Gld. 



binominata Tryou, iii, 146. v. armigera Anc., viii, 155. 



olneyce Pils. P. roperi Pils., viii, 154. 



v. blandi Hem ph. P. loricata Gld., iii, 145. 



v. harfordiana W. G. B., iii, lecontii Lea. 



commutanda Anc. [146. P. levettei Bid., iii, 143. 



salmonensis Tryon, iii, 146. thomsoniana Anc. 



v. oregouensisHemph. orobcena Anc. 

 P. devia Gld., iii, 154. 

 baskervillei Pfr. 



* * * 



P. prof un da Say, iii, 155. P. kiowaensis Simp., viii, 155. 



riahardi Fer. v. arkansaensis Pils., viii, 156. 



/ bulbina Dh. P. townsendiana Lea, iv, 72. 



P. sayii Binn., iii, 155. pedestris and ruida, Gld. 



diodonta Say, not Miihlf. v. ptychophora A. D. Br., iii, 



v. chilhoweensis Lewis, iii, [154. 



[155. f. castanea Hemph. 



* * * 



P. albolabris Say, iii, 150. v. traversensis Leach. 



riifa DeK. v. major Binn., iii, 150. 

 v. maritima Pils. 



