EMBRYOLOGY OF CRYPTOBRAXCHUS 



517 



Fig. 186 Antero-dorsal view of a living embryo of Cryptobranchus allegehe- 

 niensis in Stage 15, viewed mainly by transmitted light. From a freehand sketch. 

 X 10. 



188 



189 



Fig. 187 Lateral view of an embryo of Cryptobranchus allegheniensis in Stage 

 15, showing the position of the embryonic body. The egg is shown in its natural 

 position with respect to the vertical axis which passes in the plane of the paper 

 parallel to its lateral margins. Camera drawing from preserved material. X 5. 



Figs. 188 and 189 Posterior views of embryos of Cryptobranchus alleghenien- 

 sis in Stage 10, showing the form of the late blastopore. Camera drawings from 

 preserved material. X 5. 



Figs. 183, 187 and 188 All drawn from the same embryo. 



Figs. 185 and 189 Drawn from the same embryo. 



