RELATIONSHIP OF AMMOCGTES TO OSTRACODERMS 335 
~Na.cart. 
ce 
no 
Fig. 134,—Sxeteton or Hrap-Recion or Ammoce rss. A, Lateran View; B, 
VENTRAL VIEW; C, DorsaL VIEW. 
Muco-cartilage, red ; soft cartilage, blue; hard cartilage, purple. sk,, skp, sks, 
skeletal bars; c.e., position of pineal eye; na. cart., nasal cartilage ; ped., pedicle ; 
cr., cranium; nc., notochord, 
