REPTILES. 159 



GLOSSARY. 



Abdominal plates. The anlepoimltiniato pair of large scales on 

 tlie plastron in turtles. (See Fij>'. 25.) 



Alveolar surface. The niasticatory surface of the jaws in turtles. 



Anal plate. The large scale just in front of the anus in snakes. 

 (See Fig. 23.) The posterior plates on the plastron of a turtle. 

 (Fig. 2.5.) 



Azygous scale. Occurring singly, i. e., unpaired. Applied to the 

 small plate on the median line of the snout in Heterocfon platjj- 

 rhiiius. 



Bridge. The part of the shell which joins the carapace and 

 plastron in turtles. 



Canthus rostralis. The ridge from the eye to the tip of the snout 

 that separates the top of the muzzle from the side. 



Carapace. The upper shell in turtles. (See Fig. 24.) 



Cephalic plates. The large scales on the top of the head in snakes. 

 (See Fig. 22.) 



Costal plates. The row of large scales between the marginal and 

 vertebral series on the carapace in turtles. (See Fig. 24.) 



Dorsal scales. The scales on the upper surface of the body in 

 snakes. (See Fig. 23.) 



Emarginate. Obtusely notched. 



Femoral plates. The penultimate pair of scales on the plastron 

 in turtles. (See Fig. 25.) 



Frontal. The single large scale on the top of the head, and be- 

 tween the supraoculars, in snakes. (See Fig. 22.) 



Gular plate. In turtles, the first plate or pair of plates on the 

 plastron. (See Fig. 25.) 



Hinge. A transverse joint in the plastron in some turtles. 



Humeral plates. The second pair of scales on the plastron in 

 turtles. (See Fig. 25.) 



Internasal plates. The two large scales on top of the head, 

 and between the nasals, in snakes. (See Fig. 22.) 



Keel. A ridge. 



Labial plates. See upper labials and lower labials. 



Loreal jdate. The scale on the side of the head, between the 

 nasals and i>reocular, in snakes. (See Fig. 21.) 



Lower labial plates. The row of scales along the margin of the 

 lower jaw in snakes. (See Fig. 21.) 



