CONTRIBUTIONS TO CONCHOLOGY.-Vol. 2. 



MONOGRAPH 



ORDER PHOLADACEA. 



AND OTHER PAPERS. 



BY GEORGE W TRYON, JR., 



MEMUER OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELFUIA, 



CORRESPONDING MEMBER OF THE CALIFORNIA ACADEMY OF 



NATURAL SCIENCES, SAN FRANCISCO, CALIFORNIA. 



SMtTHSOty^ 



MAR 7 1988 



PHILADELPHIA: 



MERRIHEW & THOMPSON, PRINTERS, 



Lodge St., corner of Kenton Place. 



December 31st, 1862. 



