REPTILIA. 



21 I 



semble, so far as is known, the Lacertilia. The amnion arises 

 early, and soon forms a great cephalic hood. Before develop- 

 ment has proceeded very far the embryo turns over on to its 

 left side. The tail in many species attains a very considerable 



Ir.l 1>r.2 



U 



f.t 



FIG. 131. CHELONE MIDAS, FIRST STAGE. 



Au. auditory capsule; Ir. i and 2, branchial arches; C. carapace; E. eye; f.b. 

 fore-brain; /./. fore-limb; //. heart; h.b. hind-brain; //./. hind-limb; hy. hyoid ; 

 m.b. mid-brain; mn. mandible; mx.p. maxillo-palatine; N. nostril; //. umbilicus. 



FIG. 132. CHELONE MIDAS, SECOND STAGE. 

 Letters as in fig. 131. 



142 



