COCCOSTEOMORPHI 



265 



FIG. 234. 



Outer view of rightjaws of Dinichthys intermedius, Newb. ; Upper Devonian, Ohio, v, anterior 

 upper piercing plate ; md, lower piercing and cutting plate-; p, posterior cutting plate ; >o, sub- 

 orbital, showing lateral-line groove. (From lirit. Mus. Guide.) 



Fia. 235. 



Homostcus millcri, Traq. Cranial and dorsal shields, etc., restored. (After Traquair, from 

 A. S. Woodward.) A, B, C, undetermined bones ; a.dl, anterior dorso-lateral ; ar, ethmoid ; 

 c, central; e.o, external occipital; m, marginal; m.d, median dorsal; m.o, median occipital; 

 o, orbit ; p.dl, posterior dorso-lateral ; po, preorbitol ; ptt, pineal ; pto, postorbital. Double 

 dotted lines indicate the course of lateral-line canals. 



