260 Trans. Acad. Sci. of St. Louis. 



Snout. — The portion of the head in front of the eyes. 



Squamosal. — A bone usually overlying the inner ear; in snakes attached 

 to the hinder portion of the skull and supporting the quadrate. 



Subcaudals. — The large scales on the under side of the tail of a snake. 



Subcircular. — Nearly round. 



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



Suborbitals. — The plates between the eye and the labials. 



Superciliary. — The plates over the eye of a snake. 



Symphysis. — Junctures of bones, especiallj- along the median line. 



Tarsal bones. — Bones in the ankle between the long bones of the foot 

 and leg. 



Temporal arch. — A bony bar from the upper jaw to the quadrate, over- 

 lying the temporal muscle, found in some tortoises. 



Temporal plates. — Between the occipitals and labials. 



Tympanum. — The drum-head of the ear. 



Urostyle. — The rod-like posterior termination of the spinal column of 

 frogs. 



Vent. — The opening outwardly of the cloaca. 



Ventrals. — The epidermal plates on the belly of snakes. Gastrosteges. 



"Vertebra. — One of the bones of the back. 



Vertical plate. — In the center of the top of the head between the eyes. 

 Frontal plate. 



Vitta. — A stripe. 



Vomer. — A bone lying in the roof of the mouth just behind the pre- 

 maxillary, one on each side, in amphibia and reptilia. 



Vomero-palatine. — The united vomer and palatine. 



Xiphisternum. — The posterior segment of the sternum. 



Zygomatic arch. — Temporal arch of bones in turtles. 



