PA LA EONISCOIDEI 



3ii 



Traq. ; Rhadinichthys, Traq.; Holurus, Traq. ; Phanerosteon, Traq. ; Car- 

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

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



Gheirolepis, sp., L. Devonian. A, transverse section of scale. 15, 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 : y.c, vertical canal. 



Fig. 2S9. 



Restoration of Trissolepis Kovmoviensis, Fr. (After Fritsch.) a./, anal fin ; ax, scale-covered 

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



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

 Permian and Carboniferous. Elontckthys, Geibel ; Carboniferous in 

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

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



