49 



LEA, ISAAC, LL.D.— (Continued.) 



Remarks on a Letter from Dr. Showalter, concerning Physa. 

 (May 8th.) 



New Series, p. 147. Miiy, ISOO. 



Description of fourteen new Species of Schij^ostomoo, Anculo- 

 sge, and Litliasia^. (Read May 22d.) 



New Series, p. 1S6. May, 1S60. 



Descriptions of two new Species of Uniones from Georgia. 

 (Read July 3d.) 



New Series, p. 305. July, 1S60. 



Descriptions of three new Uniones from Mexico. (Read July 

 3d.) 



New Series, p. 305. July, 1S60. 



Descriptions of seven new Species of l^nionidne from the United 

 States. (Read July 3d.) 



New Series, p. 306. July, 1860. 



Descriptions of six new Species of Unionid?e from Alabama. 

 (Read July 3d.) 



New Series, p. 307. July, 1860. 



Descriptions of three new Species of Exotic Unionidte, (Read 

 July 3d.) 



New Series, p. 307. July, 1860. 



Extract of Letter from Bishop Elliot on Helix Cumberlandiana, 

 and Remarks thereon. (September 18th.) 



New Series, p. 363. September, 1860. 



Note. — Mr. Lea's written articles published in the Proceedings, are all elaborated in the .Tournal of 

 the Academy. 



IN JOURNAL OF THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA, 



Second Series. 



These Papers are issued separately in Pamphlet form, and arc also contained i?i the 



" Observations on the Genus U7iio." 



On the Genus Acostoea of d'oebigny, a Freshwater Lamelli- 

 branchia. 



Vol. ii, Part 2, p. 125. January, 1852, 



Descriptions of Exotic Genera and Species of the Family Union- 

 idoc. 



Vol. iii. Part 4, p. 280. February, 1858. 



