76 



PISCES 



divided distally, and the caudal obliquely truncated. Teeth small. Scales 



rugose, denticulated on the hinder 

 border ; two or more rows of 

 scales on the flank remarkably 

 deepened. Coal Measures ; Ohio, 

 and rarely England. 



Nemat opt y dims, BhadinicJi thji , 

 Traquair ; Cijdoptychms, Young. 

 Carboniferous. 



Pygopterus, Ag. Kupfer- 

 schiefer. 



Palaeoniscus, Blv. emend. Tra- 

 quair (Fig. 136). Slender fishes, 

 small or of moderate size. Teeth 

 sharply pointed, of different sizes. 

 Fins small, the rays articulated 

 and divided distally. Dorsal in 

 Scales rhombic, marked with irregular oblique furrows. 



A B 



rjiJe'pis tuhcrculntus, Newb. Coal Measures 

 Linton. Ohio. 



front of the anal fin. 



Fig. 136. 



Palaeoniscus iiiacropomus, Ag. Restora- 

 tion of head {A), pectoral arch (B), and 

 caudal fin (C). Natural size. Knpfer- 

 schiefer ; Thuringia. af, Anterior frontal ; 

 ag, Angular ; br, Branchiostegal ray.s ; cl, 

 clavicle ; d, Dentary ; e, Ethmoid ; /, 

 Frontal ; id, Infraelavicle ; iofi, Suboper- 

 culuni ; mx. Maxilla ; n, Narial opening ; 

 op. Operculum ; p, Parietal ; pel. Post- 

 clavicle ; po}), Preoperculum ; pi. Post- 

 temporal ; pnix, Preniaxilla ; q, Squa- 

 mosal ; scl, Supraclavicle ; so, Circuni- 

 orbital ring and suborV)ital« ; st, Supra- 

 lemporal. Dotted lines indicate course of 

 sensory canals (after Traquair). 



P. freieslebeni, Blv. (Fig. 136), and other species very common. in the Kupfer- 



