THE TEETH OF EEPTILES 



111 



The Chelonia comprise the turtles, land and 

 water tortoises, etc. In these curious reptiles the 



PiG. 37. — Roentgenogram of skull of Turtle (Chelonia mydes). (By 

 Dr. E. H. Skinner.) 



endo- and exo-skeletons are combined to form the 

 very singular box-like structure, the carapace, 

 which incloses and protects the animal's organs. 



