PLATE II. 



Fig. 7. Section through the first caudal vertebra of same specimen. 



Fig. 8. Sagittal section through the axial region of a young Amia, 15 mm. long. 

 Taken just behind the head. Shows the bases of the upper arches placed between 

 the intercalated cartilages, which themselves rest on the elastica externa. 



Fig' 9. Transverse section through 8th dorsal vertebra of Amia 27 mm. long. 



