Page. 



s connecticut geol. and nat. hist. survey. 



Figures in Text. 



1. Cephalaspis murchisoni Egerton. Lower Old Red Sand- 



stone ; Herefordshire. ( After A. S. Woodward) . 14 



2. Outlines of Acanthodian Fishes. A, Climatius scutiger 



Egerton. B, Mesacanthus mitchelli (Egerton). C, 

 Acanthodes sulcatus Agassiz. D, Acanthodes gracilis 

 Roemer . . . . . . .15 



3. Cladoselache fyleri Newberry. Cleveland shales (Upper 



Devonian ); near Cleveland, Ohio. (After Bashford 

 Dean) ....... 16 



4. Dipterus vahnciennesi Sedgwick and Murchison. Lower 



Old Red Sandstone ; Scotland. (After R. H. Traquair) 17 



5. Catoptenis redfieldi Egerton. Trias ; Durham, Connecticut. 



Reproduction of Newberry's original drawing of dorso- 

 lateral aspect of the head ..... 54 



6. Catopterus redjieldi^gerton. Trias; Durham, Connecticut. 



Reproduction of Newberry's original drawing show- 

 ing under side of the head • • . . 54 



7. Comparative diagrams showing types of cranial structure. 



I, Rhabdolepis. 2, Nematoptychius. 3, Rhadinichthys. 

 4, Palceoniscus. 5, Semionotus .... 



8. Semionotus agassizii (W. C. Redfield). Trias ; Sunderland, 



Massachusetts. X^ . . . . .62 



59 



