7b 



TRANSACTIONS OF THE 



CLASS REPTILIA. 

 ORDER CHELONIA. 



Fossil bones and breast-plates of turtles are not im- 

 frequently discovered in the Jersey " marl-pits," but 

 are too imperfect to admit of any satisfactory arrange- 

 ment into genera or species ; they occur principally in 

 the Atlantic secondary. Specimens preserved in the 

 Cab. of A. N. S. and Lyc. Nat. Hist. N. York. 



ORDER SAURIA. 

 Genus Crocodilus. Cuv., 

 C. macrorhyncus. Harlan, 



Journ. of the Acad, of Nat. Sciences, Philada. Vol. iv. p. 15, pi. i. 



Several fine specimens of the jaw, teeth, vertebras 

 &c. of an extinct fossil species of crocodile from the 

 New Jersey marl-pits,* are contained in the Cab. of Ac. 

 Nat. Sciences ; the most perfect of these is described 

 and figured as above referred to. It consists of the 

 dental bone of the right side, in a good state of preser- 

 vation, perfectly fossilized, or impregnated with iron, 

 so abundant in the marl-pits of New Jersey ; it contains 

 the sockets of eleven teeth in a space of twelve inches. 



The most striking peculiarity of this remnant is its 

 great thickness in proportion to its length, compared 

 with the same part in recent crocodiles, with which cir- 

 cumstance the structure and appearance of the teeth 



* Marl-pits occur both in the secondary and tertiary of the Atlantic coast. 



