AMPHIBIA AND REPTILIA OF COLORADO 1 25 



Jnterorbitals. Same as interoculars. 



Keeled. With a distinct elevated ridge. 



Labials. Scales margining the jaws. Superior labials, Fig. 35, No. 5; inferior 



labials, Fig. 35, No. 3. 

 Loreal plate. Small plate between the preoculars and the nasals. 

 Marginal plates. The outside row of plates of the carapace of a turtle. See 



Fig. 37, No. 3. 

 Mental plates. Plates in the chin region. 

 Mesial. Pertaining to the middle. 

 Muzzle. The elevated portion of the snout. 

 Neurals. The plates along the middle of the carapace of a turtle. See Fig. 37, 



No. I. 

 Nape. The back of the neck. 

 Nasal plates. The plate or plates carrying the nasal opening. See Fig. 35, Nos. 



9 and 10. 

 Nuchal plate. A small median marginal plate of the carapace of turtles, just back 



of the head. See Fig. 37, No. 4. 

 Jccipital. Pertaining to the top of the back of the head. 

 Occipital condyle. A process on the occipital bone forming the major articulation 



of the skull with the backbone. 

 Occipital plate. A plate in the occipital region. 

 Oviparous. Egg-laying. 



Ovoviviparous. Retaining the egg until hatched, or until the time of hatching. 

 Parotoid glands. Large glands on the sides of the head of many amphibians, in 



the region of the ear. 

 Parietals. Plates on the top of the head. See Fig. 36, No. 13. 

 Plastron. The ventral bony or cartilaginous shield of turtles. 

 Poikilothermous. Having a body temperature approximately the same as that of 



the surrounding medium. Popularly called "Cold-Blooded." 

 Postgenials. The second pair of four large plates lying near the middle of the 



mental region. 

 Postorbitals. Scales just back of the eye. See Fig. 35, No. 4. 

 Prefrontals. A pair of plates just in front of the frontal. See Fig. 36, No. 14. 

 Preoculars. Scales just in front of the eye. See Fig. 35, No. 2. 

 Rostral. A plate forming the anterior end of the head. See Figs. 35 and 36, 



No. I. 

 Subcaudals. The large plates on the ventral surface of the tail of a snake. 

 Superciliary. Plates just above the eye on the margin of the head. 

 Supraocular. Plates just above the eye, forming the roof of the orbit. See 



Fig. 35, No. 6, and Fig. 36, No. 12. 

 Temporal. The posterior portion of the side of the head. 

 Tessellated. With a spotted or checkerboard pattern. 

 Tympanic membrane. That covering the ear opening. 

 Vent. The posterior opening of the alimentary canal. 

 Venirals. Large plates on the ventral surface of snakes. 

 Viviparous. Bearing living young. 



