Jg^sr 



ii^ 



[Uighbunj. 



ri jtui I J I) :i/ L II 1 



CROCODILE, WELL ILLUSTKATING THE CHARACTER OF THE DENTITION. 



The lower tuak-Iike teeth fit into notches in the upper jaw, and are visible when the mouth is closed. In the alligator these teeth fit into pits in 



the upper jaw, and are hidden from view under the lilie conditions. 



549 



