KEPT I LI A. 



175 



horny plates (tortoise shell), and in the mesoblast below the bony 

 elements of the carapace (figs. 132 and 133). 



Immediately after hatching the yolk-sack becomes withdrawn into 

 the body ; while the external part of the allantois shrivels up. 



Aa 



Fio. 132. Chelone midas, second stage. 

 Letters as in fig. 131. 



All hjf 



Fig. 133. Chelone midas, third stage. 

 Letters as in fig. 131. r. rostrum. 



