286 



OSTEOLEPIDOT1 



Scotland. Sauriptenis, Hall 



FIG. 25t>. 



Rhizodopsis sauroldef, Will. Right-side view of 

 head, restored. (After Traquair, from A. 8. 

 Woodward.) ag, angular ; d, dentary ; /, frontal ; 

 i.d, infradentary ; j, jwiired inferior gular ; l.j, 

 lateral gulars ; m.j, median inferior gular ; ma 1 , 

 maxilla ; op, opercular ; or, orbit ; />/, post-frontal ; 

 pmx, premaxilla ; pop, preopercular ; pa, parietal ; 

 x.o, suborbitals ; s.oj>, subopercular ; st, supra- 

 temporals ; s, pterotic (squamosal) ; *, *>, cheek- England and North America. 



Cricodus, Ag. ; Upper Devonian, 

 Europe and North America. 

 Eusthenopteron, Whiteaves (Fig. 

 258) ; Upper Devonian, Canada. 

 Rhizodus, Owen ; Strepsodus, 

 Young ; Rhizodopsis, Young (Fig. 

 256); Carboniferous, Europe and 

 North America. 



Family ONYCHODOXTIDAE. In- 

 completely known Osteolepidoti 

 with tuberculated cycloid scales, 

 and mandibular teeth with 

 folded base, of which some very 

 large ones are situated at the 

 symphysis. 



Onychodus, Newb. ; Devonian, 



FIG. 257. 



lihizodopsis saui-oides, Will. A, dorsal view of skull, restored. (After Traquair, from 

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

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

 A. 8. Woodward.) j, paired inferior gular ; l.j, lateral gulars ; m.j, median gular ; ran, man- 

 dible ; sop, subopercular. 



FIG. 258. 



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

 el, cleithrum (clavicle) ; /r, frontal ; i.d, clavicle ; run, mandible ; mx, maxilla ; op, opercular ; 

 pa, parietal ; sd, supraclavicle ; sop, subopercular ; st, supratemporal ; sbo, suborbital ; x, 

 cheek-plate. 



