THE NERVOUS SYSTEM OF AMPHIBIA 



223 



Fig. 54 From the level of the unsegmented mesoderm immediately caudal of 

 the thirty-seventh myotome of Specimen 444. 



Fig. oo From an embryo of the non-motile stage, at the level of the root of 

 the glossopharyngeal nerve. Transverse plane. Fixations in Van Gechuchten's 

 alcohol-chloroform-acetic-acid solution transverse plane; thickness, 10 m- 



