774 ALLIS. 
EXPLANATION OF PLATE XxXI. 
Fic. 8. Top view of primordial cranium and first three vertebrae of adult 
Amia. The spinal and occipital dorsal arches have been removed and also the 
intercalar bone on the left side of the skull. X 1%. 
Fic. 9. Side view of same, the spinal and occipital dorsal arches in place. 
xX 1%. 
Fic. 10. Bottom view of same. X 1%. 
Fic. 11. Inside view of primordial cranium, vertically bisected. X 1%. 
