PLATE 5 



EXPLANATION OF FIGURES 



(Cryptobranchus allegheniensis) 



Bicliroiuate-acetic-fonnaliii fixalion. X 4. 



228 Stage 13.5. Posterior view showing the form of the late blastopore, and 

 the ])08terior j^art of the neural pLate. 



229 Stage 14.1. Dorsal view showing neural folds and the early segmentation 

 of tlie neural plate. Figure IGO is drawn from the same embryo. 



230 Stage 14.1. Postero-dorsal view of the same embryo as in the preceding 

 figure, showing the late blastopore and the segmentation of the neural plate. 



231 Stage 14.9. Posterior view, showing the late blastopore. Figure 176 

 is drawn from the same egg. 



232. Stage 14.9. Dorsal view of the same embryo as in the preceding figure, 

 showing the segmentation of the neural plate. 



233 Stage 15.4. Dorsal view. Figure 184 is drawn from the same egg. 



234 Stage 15.8. Dorsal view. Figure 182 is drawn from the same egg. 



235 Stage 16.0. Dorsal view showing closing neural folds. 



236 Stage 16.8. Dorsal view. 



237 Stage 16.8. Antero-dorso-lateral view of the same embiyo as in the pre- 

 ceding figure. 



238 Stage 17. Antei-o-dorsal view (inverted with respect to the natural i)osi- 



tion). 



239 Stage 17. Lateral view. 



.5()8 



