PALAEONISCOIDEI 



The hyomandibular is elongated backwards and connected with a 

 broad pterygoid plate. A symplectic has not been found. The lower 

 jaw has dentary, angular, splenial, and articular bones. 



Numerous radials occur in the pelvic fin of Coccolepis (A. S. Woodward 

 [501]), the only genus in which the endoskeleton of the fins is known. 



FIG. 286. 

 Palaeoniscus macropomus, Ag. ; restored. (After Traquair, from A. S. Woodward.) 



Sub -Family CHEIROLEPIDINAE. The Devonian Cheirolepis in the 

 minute size of its scales fitting close together, but scarcely overlapping, 

 approximates to the Acanthodii (Fig. 288) ; but otherwise it is a genuine 

 Palaeoniscid. The proximal lengthened segment of the lepidotrichia passes 

 inwards below the body-scales, overlapping the endoskeletal radials. The 



FIG. 287. 



Head of Palaeoniscus macropomiia, Ag. ; restored. (After Traquair, from A. S. Woodward.) 

 /, prefrontel ; ag, angular ; br, branchiostegals (lateral gulars) ; d, cleithrum ; rf, dentary ; e, 

 ethmoid ; /, frontal ; i.d, clavicle ; i.op, subopercular ; mx, maxilla ; n, narial opening ; op, 

 opercular ; p, parietal ; p.d, post-clavicle ; p. op, preopercular ; pt, post-temporal ; pmx, pre- 

 maxilla ; q, pterotic (squamosal) ; sd, supraclavicle ; so, circumorbital ring and postorbitals ; 

 st, supratemporal. Dotted lines indicate the course of lateral-line canals. 



anterior paired gulars are large, and there are large laniary teeth on the 

 jaws (Traquair [444]). 



Cheirolepis, Ag. ; Devonian of Europe and Canada. 



Sub-Family PALAEOXISCIDINAE. The paired gular plates are not 

 much enlarged, the scales are of normal size, the lepidotrichia scarcely 

 extend inwards, and the teeth are usually. quite small [446]. 



Canobius, Traq. ; Cryphiolepis^Traq.; Gonatodus, Traq. ; Nematopiychius, 



