286 



OSTEOLEPIDOT1 



Scotland. Sauripterus, Hall 



Fl - 25C - 



Rhizodopsis sauroides, Will. 



Eight-side view of 

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



Cricodus, Ag. ; Upper Devonian, 

 Europe and North America. 

 Eusthenopteron, Whiteaves (Fig. 

 258) ; Upper Devonian, Canada. 

 Rhizodus, Owen ; titrepsodus, 

 Young ; Rhizodopsis y Young (Fig. 

 256) ; Carboniferous, Europe and 

 North America. 



Family ONYCHODONTIDAE. In- 

 completely known Osteolepidoti 

 with tuberculated cycloid scales, 

 and 



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



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



lateral gulars ; m.j, median inferior gular ; m'x, large ones are Situated at the 



maxilla ; op, ppercular ; or, orbit ; pf, post-frontal ; a vmt)h vsis 



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



s.o, suborbitals ; s.op, subopercular ; st, supra- Onychodus, Newb. ; Devonian, 



temporals ; sq, pterotic (squamosal) ; ,, *', cheek- England and North America. 



. if. 



Fio. 257. 



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

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

 dible ; sop, subopercular. 



PIG. 258. 



Eusthenopteron Foordi, Whiteaves ; restored. (After Whiteaves, from A. 8. Woodward.) 

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

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



