PA LA EONISCOIDEI 





Iraq. ; Khadinichthys, Traq. ; Holurus, Traq. ; Phanerosteon, Traq. ; Car- 

 boniferous, Europe. Eurylepis, Newb. ; Carboniferous, N. America. 

 Pygopterus, Ag. ; Palaeoniscus, Bl. (Fig. 286) ; Permian, Europe. 



IV. 



c 



FIG. 288. 



Cheirohpis, sp., L. Devonian. A, transverse section of scalp. B, outer view of scales 

 enlarged. C, much enlarged view of a piece of a scale cut transversely. D, a fragment of the 

 inner bony layer, magnified, dt, canaliculi of cosmine layer ; /, vertical blind canals (pulp- 

 cavities) ; g, ganoine layer ; h, system of horizontal vascular canals ; i, inner bony layer, 

 isopedine ; s, shiny outer surface ; c.c, vertical canal. 



Fio. .'80. 



Restoration of Trissolepis KmmoviensU, Fr. (After Fritsch.) a.f, anal fin ; x, scale-covered 

 tail ; c./, hypochordal fin ; d.f, dorsal, p.f, pelvic, and pt.f, pectoral fin ; /, fulcral scale. 



Amblyptenu, Ag. ; Europe. Acrolepis, Ag. ; Europe and N. America ; 

 Permian and Carboniferous. Elonichthys, Geibel ; Carboniferous in 

 Europe and N. America ; Permian in Europe. Gyrolepis, Ag. ; Trias, 

 Europe. Apateolepis, A. S. W. ; Atherstonia, A. S. W. ; Myriolepis, Eg. ; 



