1889.] NATURAL SCIENCES OF PHILADELPHIA. 203 



Subgenus POLYGYKA Say, 1818. 

 i Section Mesodon Rafinesque, ls31.) 



139. Helix jejuna Say. Georgia ; Florida. 



139a. Helix jejuna mobiliana Lea. Southern Alabama. 



140. Helix lawi Lewis. Northwestern Ga., Western N. C. 



East Tenn. 



141. Helix downieaxa Bid. Eastern Tenn. and Kentucky. 



142. Helix mitchelliana Lea. N. C. to Kentucky and Ohio. 



143. Helix clausa Say. Ohio to Dakota, Mississippi and 



Carolina. 



144. Helix multilineata Say. New York to Dakota. 



145. Helix thyroides Say. Eastern U. S. 



145a. Helix thyroides bucculenta Gld. Southern U. S. 



146. Helix andrewsi W. G. Binn. Western N. C. ; North- 



western Ga. 



147. Helix albolabris Say. Eastern U. S. 



147a. Helix albolabris major Binney. S. Carolina to Fla. 



148. Helix exoleta Binn. Western N. Y. to Missouri and 



Ga. 



149. Helix dentifera Binn. Maine to Ohio and Ga. 



150. Helix roemeri Pfr. Central and Northern Texas. 



151. Helix divesta Gould. Mississippi, Ark., Indian Ter. 



152. Helix wetherbyi Bid. Eastern Tenn. and Ky. ; Western 



N.C. 



153. Helix christyi Bid. Western North Carolina. 



154. Helix wheatleyi Bid. Western N. C. and Ga. 



155. Helix pennsylvanica Green. Western Penna. to Ya. 



and 111. 



156. Helix eleyata Say. N. Y. to Wis., south to Missouri 



and Ga. 



157. Helix clarki Lea. Eastern Tenn. ; Western N. C. 



158. Helix Columbiana Lea. Sitka to Santa Cruz, Cal. 



159. Helix armigera Ancey. California. 



160. Helix ptychophora A. D. Brown. Idaho. 



161. Helix deyius Gould. Oregon. 



162. Helix profunda Say. Western N. Y. to Minn, and 



Kansas ; South to Virginia. 



163. Helix kiowaensis Simpson. Indian Ter. 



164. Helix sayii Binney. Canada to Mich, and 111.; South to 



Md. and Tenn. 



