NORTH AMERICAN BATRACHIA AND REPTILIA. 63 



Postorbital plates — Those behind the eye. 

 Preanal pores — The pores in front of the anus. 

 Prefrontal plate — In front of postfrontal. 



Premaxillary hones — Tliose which form anterior border of upper 

 jaw, meeting in median line. 



Procoelian — Vertebrae concave in front only. 



Proximal — Nearest. 



Pubis — The anterior segment of the lower portion of the pelvic 



bones. 

 Quadrate hone — The proximal bone in the series forming the 



lower jaw; the one by which the rest are joined to the 



cranium. 

 Reniforin — Kidney-shaped. 



Rostral plate — The one that forms the tip of the snout. 

 Rugosities — Koughnesses or wrinkles. 

 Semipahnate — Toes half webbed. 

 Serrated — With saw-tooth projections. 

 Sessile — Attached without any stalk or foot. 

 Squamosal — Like a scale. 

 Sternal plates — Those on the abdomen. 

 Sternal ribs — The ribs which are attached to the sternum. 

 Subapical — Near the apex. 

 Subeaudal — Beneath the tail. 

 Subcircular — Nearly round. 

 Subcylindrical — Almost cylindrical. 

 Subgular — On the throat or under surface of the neck. 

 Suborbital plates — Those between eye and labials. 

 Superciliary — Over the eye. 

 Superciliary plate — On top of head, over eye. 

 Supranasal plate — One above the nasal. 



Symphyses — Junctures of bones, especially along median line. 

 Tarsal bones — Those in the ankle between the long bones of 



foot and leg. 

 Temporal plates — Between occipitals and labials. 

 Tymp>anum — The drum-head of the ear. 

 Xfltimate — Last or farthest. 

 Yertebra — One of the bones of the back. 



