RELATIONSHIP OF AMMOCCETES TO OSTRACODERMS 335 



TIC 



Fig. 134. — Skeleton op Head-Region of AjimocosTes. A, Lateral View; B, 



Ventral View; C, Dorsal View. 



Muco-cartilage, red ; soft cartilage, blue ; hard cartilage, purple. sk lt sk s , sk 3 , 

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

 cr., cranium; nc., notochord. 



