EGGS, HATCHING, AND CARE OF YOUNG 141 



that they breathe easily -when near the surface with- 

 out thrusting the head far up. In one of the croco- 



FlG. 63. — Gavial {Gavialis gangetica). 



dilians — the Gavial (Fig. 63) — the male has a great 

 warty bunch on the snout through which the nostrils 

 open. 



Eggs, Hatching, and Cajbe of Young 



We have spoken of the eggs of reptiles as being 

 large and free from each othei* — like those of birds. 

 Those of the crocodilians and allf tortoise-forms, ex- 

 cept the paddle-feet kinds, have limy hard shells, but 

 in all others a tough membrane only covers them. 

 They consist of a yolk and " white " as in hen eggs, 

 and in np case are they fertilized (or made so they 

 will hatch) after they have been laid, as is the case 



