13 
LEA, ISAAC, LL.D.—(Continued.) 
REPRINT OF PAPERS READ, AND REMARKS MADE BEFORE THE ACADEMY 
OF NATURAL SCIENCES OF PHILADELPHIA, IN 1856-7. 8vo. PHILA- 
DELPHIA. 1857. 
DESCRIPTION OF A NEW SPECIES OF THE GENUS UNIO. (U. SPINOSUS.) 
4to. PHILADELPHIA. 
IN CHECK LISTS OF THE SHELLS OF NORTH AMERICA. 8vo. SMITH. 
SONIAN INSTITUTION, WASHINGTON, D.C. June, 1860. 
—Check List of the Unionide. 
