CONTRIBUTIONS 
TO 
THE NATURAL HISTORY 
UNITED STATES OF AMERICA. 
BY 
EO Uri Ss AGACS S LZ: KO 
FIRST MONOGRAPH. 
IN THREE PARTS.—I. ESSAY ON CLASSIFICATION.—II. NORTH AMERICAN TESTUDINATA. — 
Ill. EMBRYOLOGY OF THE TURTLE; WITH THIRTY-FOUR PLATES. 
V OL) GI: 
B, OuSgE 0) No: 
LITTLE, BROWN AND COMPANY. 
LONDON: TRUBNER & CO. 
1857. 
