76 



PISCES 



CLASS I 



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



rugose, denticulated on the hirider 

 border ; two or more rows of 

 scales on the flank remarkably 

 deepened. Goal Measures ; Ohio, 

 and rarely England. 



Nematoptychius, Ehadinich thys, 

 Traquair ; Cycloptychius, Young. 

 Carboniferous. 



Fygopterus, Ag. Kupfer- 

 schiefer. 



Palaeonisciis, Blv. emend. Tra- 

 quair (Fig. 136). Slender fishes, 

 small or of moderate size. Teeth 

 sharply pointed, of diff'erent sizes. 

 Eins small, the rays articulated 

 and divided distally. Dorsal in 

 front of the anal fin. Scales rhombic, marked with irregulär oblique furrows. 



Fig. 135. 



Eurylepis tuberculatus, Newb. Goal Measures : 

 Linton, Ohio. 



6 Fig.' 136. 

 Palaeonisciis macropomus, Ag. Restora- 

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

 caudal fin (C). Natural size. Kupfer- 

 schiefer ; Thuringia. af, Anterior frontal ; 

 aq, Angular ; hr, Branchiostegal rays ; d, 

 ciavlcle ; d, Dentary ; e, Ethnioid ; /, 

 Frontal ; id, Infraclavicle ; top, Suboper- 

 culum ; mx, Maxilla ; n, Narial opening ; 

 op, Operculum ; p, Parietal ; pd, Post- 

 clavicle ; pop, Preoperculuni ; pt, Post- 

 temporal ; pinx, Premaxilla ; q, Squa- 

 mosal ; sd, Supraclavicle ; so, Circuni- 

 orbital ring and suborbital« ; st, Supra- 

 temporal. Dotted lines indicate course of 

 sensory canals (after Traquair). 



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



