47 



Family IV. CHELONID^E. 



Shell covered with epidermal shields. Caudal vertebrae pro- 

 coelous. Neck incompletely retractile ; cervical vertebrae short. 



Fig. 15. Skull of Chelone imlricata. 



Temple completely roofed over ; parietal bone in contact with the 

 squamosal. Limbs paddle-shaped ; phalanges without condyles : 

 claws one or two. 



The Marine Turtles belong to three species, falling into two 



