NORTH AMERICAN CONCHOLOGY. 453 



Tkans. * Ob*. 

 Vol. x, 1S53. 



l'a. PI. Fig. V. Pa. Name. Locality. 



303 v 59 Lea.. — Description of a new species of Helix from 



California, and a new characteristic form of cer- 

 tain American Colimacea. 



303 xxx 13 v 59 Helix Lecontii Lea. San Francisco. 



304 Accessory column in 



304 v 60 Carocolla spinosa Lea. 



304 v 60 Edgariana Lea. 



304 v 60 Helix hirsuta Say. 



304 v 60 mono don Rack. 



304 v 60 Leai Ward. 



304 v 60 leporina Gould. 



304 v 60 Lecontii Lea. 



304 v 60 Polygyra Troostiana Lea. 



304 v 60 Dorfeuilliana Lea. 



Jour. Acad. N. Sc. 

 Vol. iii, Jan. ISoS. 



289 vi 9 Lea. — Descriptions of Exotic Genera and species 



of the family Unionidse. (From Journal Acad. 

 Nat. Sc. Philadelphia, (n. s.), vol. iii, pt. 4. 

 Jan. 185S.) New Fresh Water and Land Shells. 

 Observations on the genus Unio, vol. vi, pt. 1, 

 1857. 



Medellin riv., Mex. 

 Rio Colorado, Texas. 

 R. de las Balsas, 

 Coyucau, Mexico. 



43 vi43 L.C». — Descriptions of the Embryonic forms of 



thirty-eight species of Unionidse, vol. iv, pt. 1. 

 Dec. 1858. (Obs. vol. vi, pt. 2.) 



