;86 



OSTEOLEPIDOTl 



Scotland. Sauripterus, Hall 



Gricodus, Ag. ; Upper Devonian, 

 Europe and North America. 

 Eusthenopteron, Whiteaves (Fig. 

 258); Upper Devonian, Canada. 

 Ehizodus, Owen ; Strepsodus, 

 5Toung ; Rhizodopsis, Young (Fig. 

 256) ; Carboniferous, Europe and 

 North America. 



Family Oxychodontidae. In- 

 completely known Osteolepidoti 

 Fic - 256 - with tuberculated cycloid scales, 



miizod<n>sUsaurouUs,wm. Right-side view of , mandibular 'teeth with 

 head, restored. (Alter Traquair, from A. b. 



Woodward.) ag, angular ; d, dentary; /, frontal ; folded base, of which some very 

 i.d, infradentary ; ;, paired inferior gular ; l.j, . •, , i , + i 



lateral gulars ; m.j, median inferior gular; mx, large ones are situated ai me 

 maxilla ; op, opercular; or, orbit : pf, post-frontal : symphysis 

 ptnx, premaxilla ; pop, preopercular ; pa, parietal ; * £ " , ' , vr i -i » 

 s.o, .suborbitals; s.op, subopercular ; st, supra- Onyclwdus, ^ewb, ; Devonian, 



temporals ; sq, pterotic (squamosal) ; x, *, cheek- En laml an( J North America. 



Fig. 257. 



Rhizodopsis sauroides, Will. A, dorsal view of skull, restored. (After Traquair, from 

 A. S. Woodward.) /, frontal; or, orbit; pa, parietal; pf, post-frontal; pmx, premaxilla; 

 sq, pterotic; st, supratemporals. B, ventral view of head, restored. (After Traquair, from 



A. S. Woodward.) j, paired inferior gular; l.j, lateral gulars; m.j, median gular; mn, man- 

 dible ; sop, subopercular. 



Fic 258. 



Eusthenopteron Foordi, Whiteaves ; restored. (After Whiteaves, from A. s. Woodward.) 

 d, cleithrum (clavicle) ; fr, frontal ; i.cl, clavicle ; win., mandible ; mx, maxilla; op, opercular ; 



pa, parietal ; *cl, supraclavicle ; sop, subopercular ; st, supratemporal ; sho, suborbital : .<, 

 cheek-plate. 



