Coe and Kunkel— California Limbless Lizard. 353 
of inactive pup of insects demonstrates the ability of the lizard to 
recognize its food without relying upon the movements of its prey. 
The lizards seem to require a considerable amount of water, and 
were often seen with their snouts thrust into the dish of water in 
the cage in which they were kept. In drinking, the neck is arched 
very much as in the process of capturing an insect. 
Visceral Anatomy. 
The structure and disposition of most of the organ systems of the 
body cavity agree closely with the descriptions published many years 
ago for Anguis. The urogenital organs, however, are so peculiarly 
modified that they form the subject of the second paper of this 
series. The peculiarities of the aborted left lung, the shape and 
position of the liver, the situation of the gall bladder, and the gen- 
eral form of the different portions of the alimentary canal are men- 
tioned by Cope (: 00, p. 670). 
Alimentary canal.—The head of this lizard is very small as com- 
pared with the other regions of the body, and the mouth is in con- 
sequence much less extensive than in most other lizards. In an 
individual 20° in length, the mouth opening extends only about 6™™ 
behind the tip of the snout, and the greatest width across the pos- 
terior ends of the mouth opening is but 5 or 6™™. The nature of 
the food and the method of its capture are described on the preced- 
ing page. 
The teeth are small, conical, slightly recurved, and rather acutely 
pointed. They are disposed in a single row on each jaw as described 
below, and figured on pl. xut, figs. 5-8. The number on the 
upper jaw is usually about 16 or 18 and on the lower jaw about 
14. The secondary buds at the bases of the developing teeth in 
the embryo indicate that, as in most other reptiles, new teeth 
develop to replace such as are accidentally lost. Small and incom- 
pletely developed teeth are often interspersed with the larger ones. 
Each tooth exhibits a very shallow oval groove along the basal half 
of its median face. : 
The tongue, as in Anguds, is much shorter than in most other 
lizards, although it is highly muscular and rather distensible in life. 
In individuals kept in captivity it does not appear to be extruded 
from the mouth either when the animal is capturing its prey or at 
other times. The organ is nearly twice as long as broad and is 
bilobed both in front and behind. In a large individual the length 
of the body of the tongue, not considering the anterior lobes, is 8™™, 
