46 INTRODUCTION 



Nuchal flate. — The unpaired marginal plate of turtles on 

 the median line at the front of the carapace. 



Occifitals. — Plates behind the parietals. Sometimes applied 

 to the parietals. 



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

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

 parietal and behind the frontoparietals. 



Pectoral flates. — The third pair of plastral plates. 



Plastral. — Pertaining to the plastron. 



Plastron. — The lower portion of the shell of turtles. 



Postabdom'mal. — 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. 



Postgemals. — The posterior pair of genials. 



Postfnentals. — Plates behind the mental. See sublabial and 

 genial. 



Postocular. — Bounding the orbit behind. 



Preanal. — In front of the anus. 



Preanal fores. — Glands opening in front of the anus. 



Prefrontal. — Scales between intemasals and frontal. Some- 

 times applied to the internasals. 



Pregenials. — The anterior pair of genials. 



Prenasal. — Anterior nasal. 



Preocular. — Bordering the orbit in front. 



Pseudo-preocular. — 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. 



