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 macropom us, Ag. ; restored. (After Traqnair, uom 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 



\pcl 



Head of Palaeoniscits macropomus, Ag. ; restored. (After Traquair, from A. S. Woodward.) 

 a/, prefrontal ; ag, angular ; br, branchiostegals (lateral gulars) ; d, cleithrum ; <l, dentary ; , 

 ethmoid ; /, frontal ; i.'cl, clavicle ; Lop, subopercular ; mx, maxilla ; n, narial opening ; o)>, 

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

 raaxilla ; q t pterotic (squamosal) ; scl, supraclavicle ; so, circuraorbital ring and postorbitals ; 

 st, supratemporal. Dotted lines indicate tlie 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 PALAEONISCIDINAE. 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. ; Nematoptychius, 



