296 



THE ORIGIN OF VERTEBRATES 



ski 



Fig. 118.— Skeleton of Head-Region of Ammococtes. A, Lateral View; B, 



Ventral View ; C, Dorsal View. 



Muco-cartilagc, red ; soft cartilage, blue ; hard cartilage, pttrjilc. sk u sk„, sk 3 , 

 skeletal bars ; ex., position of pineal eye ; na. cart., nasal cartilage ; peel., pedicle ; 

 o\, cranium ; nc., notochord. 



