46 INTRODUCTION 



Nuchal ^plate. The unpaired marginal plate of turtles on 

 the median line at the front of the carapace. 



Occipital*. Plates behind the parietals. Sometimes applied 

 to the parietals. 



Parietals. In most snakes, the largest and last plates on 

 top of the head 5 in lizards, plates at the side of the inter- 

 parietal and behind the frontoparietals. 



Pectoral plates. The third pair of plastral plates. 



Plastral. Pertaining to the plastron. 



Plastron. The lower portion of the shell of turtles. 



Postabdominal. Anal plate. 



Postanal. Behind the anus, especially a pair of large plates 

 in the males of some lizards. 



Posterior. Toward the tail. 



Postfrontals. See prefrontals. 



Postgenials. The posterior pair of genials. 



Postmentals. Plates behind the mental. See sublabial and 

 genial. 



Postocular. Bounding the orbit behind. 



Preanal. In front of the anus. 



Preanal 'pores. Glands opening in front of the anus. 



Pre frontal. Scales between internasals and frontal. Some- 

 times applied to the internasals. 



Pregenials. The anterior pair of genials. 



Prenasal. Anterior nasal. 



Preocular. Bordering the orbit in front. 



Pseudo$reocular. Small plate or plates below the pre- 

 ocular. 



Reticulate. Marked with lines like the meshes of a net. 



Rostral. Plate on the tip of the snout. 



Scute. A scale, especially a large flat one. 



Subcaudals. Urosteges. 



Sublabials. Plates below the infralabials. 



Subocular. Scales between the eye and supralabials. 



