776 ALES. 
EXPLANATION OF PLATE XXII. 
Fic. 12. Genealogical tree based on the innervation of the muscles of the eye- 
ball. 
Fic. 13. Side view of basisphenoid of adult Amia. X 1¥. 
Fic. 14. Top view of same. X 1}. 
Fic. 15. Bottom view of same. X 1%. 
Fic. 16. Rear view of primordial cranium, looking slightly from above. Same 
specimen as Figs. 8-11. The intercalar bone removed on left side. X 1%. 
Fic. 17. Top view of parasphenoid of a different and larger specimen. X 1%. 
Fic. 18. Top view of himd end of cranium and first six vertebrae of a third 
specimen. On the right side the occipitale laterale and the dorsal, spinal, and 
occipital arches have been entirely removed. On the left side the ventral half of 
the occipitale laterale and the ventral, cartilaginous ends of the dorsal arches are 
left in place. xX 2. 
