it 
LEA, ISAAC, LL.D.—(Continued.) 
Remarks on a Letter from Dr. Showalter, concerning Physa. 
(May 8th.) 
New Series, p. 147. May, 1860. 
Description of fourteen new species of Schizostome, Anculo- 
se, and Lithasie. (Read May 22d.) 
New Series, p. 186. May, 1860. 
Descriptions of two new species of Uniones from Georgia. 
(Read July 8d.) 
New Series, p. 305. July, 1860. 
Descriptions of three new Uniones from Mexico. (Read July 
od.) 
New Series, p. 305. July, 1860. 
Descriptions of seven new species of Unionidz from the United 
States. (Read July 3d.) 
New Series, p. 306. July, 1860. 
Descriptions of six new species of Unionide from Alabama, 
_ (Read July 3d.) 
New Series, p. 307. July, 1860. 
Descriptions of three new species of Exotic Unionide. (Read 
July 8d.) 
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. 
Notg.—Mr. Lea’s written articles published in the Proceedings, are all elaborated in the Journal of 
the Academy. 
IN JOURNAL OF THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 
SECOND SERIES. 
These Papers are issued separately in Pamphlet form, and are also contained in the 
“* Observations on the Genus Unio.” 
On the Genus Acostiea of D’oRBIGNY, a Freshwater Lamelli- 
branchia. 
Vol. ii, Part 2, p. 125. January, 1852, 
Descriptions of Exotic Genera and species of the Family Union- 
idee. 
Vol. iii, Part 4, p. 289. February, 1858. 
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