158 NEW YORK ZOOLOGICAL SOCIETY. 



PHOTOGRAPH. 



ELWCN It. SANBORN. 



GLASS SNAKE. 

 Typical representative of the family Anguidae. 



type of strictly oviparous lizard. The eggs are very large in pro- 

 portion to the reptile's size. A specimen in the Reptile House 

 measuring nineteen and one-half inches deposited four eggs, 

 each of which measured two and three-quarter inches in length 

 and one and one-half inches in diameter. These eggs were fertile, 

 but in such a primary state of development that they contained 

 nothing but a germinating spot to represent the future embryo. 

 Incubation in warm sand produced further development, but at 

 the end of two weeks the leathery integument covering the eggs 

 began to shrivel, and despite the moistening of the sand and va- 

 rious precautions taken to complete the growth of the embryo, 

 their contents solidified. From our notes concerning this species 

 it would seem that the number of eggs deposited is always small, 

 varying from three to five, a condition noted of many of the 

 North American lizards. The largest number of eggs deposited 

 by any North American lizard in our Reptile House was twelve, 

 from a Swift (Sceloporus undulatus). 



