REPTILES. 161 



Upper labials. The series of scales along the margin of the upper 

 jaw in snakes. (See Fig. 21.) 



A>ntral plates. The large scales on the ventral surface of the 

 body in snakes. (See Fig. 23.) 



Vertebral plates. The median dorsal series of scutes on the cara- 

 pace in turtles. (See Fig. 24.) 



21 



