302 LEA 
Lea (Isaac). [On the great size and weight to which some of the Naiades 
attain in the waters of the Valley of the Ohio.| (Tract.) 
8vo. Philadelphia ?, 1854. 
——. [On the soft parts of the American Fresh-water Molluscs. | 
(‘Tract.) 8vo. Philadelphia?, 1854. 
——. Description of a new Mollusk from the Red Sandstone near 
Pottsville, Pa. (Tract.) 8vo. Philadelphia, 1855. . 
Fossil Footmarks in the Red Sandstone of Pottsville, Pennsyl- 
vania. Fol. Philadelphia, 1855. 
Extracts of papers from the Proceedings of the Academy of 
Natural Sciences of Philadelphia. (Tracts.)} 
8vo. Philadelphia, 1856. 
——. Description of four new Freshwater Mollusks from the Isthmus 
of Darien and Honduras. (Tract.) 8vo. Philadelphia, 1858. 
—. Descriptions of a new Helix and two new Planorbes. (Tract.) 
8vo. Philadelphia, 1858. 
——. Descriptions of eight new species of Unio from Tennessee, Ala- 


bama, and North Carolina. (Tract.) 8vo. Philadelphia, 1858. 
——. Descriptions of seven new species of Margaritane, and four new 
species of Anodontew. (Tract.) 8vo. Philadelphia, 1858. 
——. Descriptions of twelve new species of Uniones and other Fresh- 
water Shells of the United States. (Tract.) 8vo. Philadelphia, 1858. 
-——. Descriptions of twenty-seven new species of Uniones from Georgia. 
(Tract.) 8vo. Philadelphia, 1858. 
——. Margaritana complanata and Unio multiplicatus. (Tract.) 
8vo. Philadelphia, 1858, 
——. On the Age of the Red Sandstone of Pennsylvania. (Tract.) 
8vo. Philadelphia, 1858. 
——. On the Cretaceous Formation of the United States. (Tract.) 
8vo. Philadelphia, 1858. 
——. On Unio rubiginosus. (Tract.) 8vo. Philadelphia, 1858. 
——. Remarks on the Unionide of Nebraska Territory and Red River 
of the North. (Tract.) 8vo. Philadelphia, 1858. 

(Check-list of the Shells of North America.) Unionide. (Tract.) 
8vo. Washington, 1860. 
——. Descriptions of eight new species of Unionide from Georgia, 
Mississippi, and Texas; of twenty-one new species of Exotic Unio- 
nide ; and of two new species of Uniones from Georgia ; Remarks 
on the death of Alexander von Humboldt; Descriptions of twelve 
new species of Uniones from Georgia, and other papers on Unionidae, 
ete. (Tract.) | 8vo. Philadelphia, 1860. 
Publications on recent Conchology, extracted from a list of 
American Writers on recent Conchology, by George W. Tryon, Jun. 
(Tract.) 8vo. Philadelphia, 1861. | 
—., Check-list of the Shells of North America. Unionide. | (Tract.) 
8vo. Washington, 1862. 
—. Conchological Papers :—Remarks on the number of Unionide ; 
Descriptions of fifteen new species of Uruguayan Unionide ; De- 
scriptions of four new species of Unionidex from Brazil and Buenos 
Ayres; Remarks on the color of the Unionide ; Descriptions of 
four new species of Melanie of the United States ; Descriptions of 



