﻿PALiEONISClDiE. 



429 



anterior pectoral 

 fin-rays articulated in distal 

 third; dorsal and anal fins 

 short-based; scales large, con- 

 centrically striated Cycloptychius (p. 459). 



Trunk fusiform ; anterior pectoral 

 fin-rays articulated distally ; 

 dorsal and anal fins short-based ; 

 scales large, obliquely striated. . Rhadinichthys (p. 461). 



Trunk elongated ; anterior pectoral 

 fin - rays articulated distally ; 

 anal fin much extended ; scales 

 small, smooth or feebly striated. Pygopterus (p. 470). 



Trunk elongated ; dorsal and anal 

 fins short-based ; scales small, 

 smooth or feebly striated .... Trachelacanthus (p. 475). 



[Imperfectly defined.] Fins large 

 and somewhat extended ; scales 

 obliquely striated Urolepis (p. 475). 



Dorsal fin in advance of anal ; den- 

 tition feeble. 



Fins small, fulcra absent ; scales of 



flank rudimentary or absent . . Phanerosteon (p. 476). 



Fins small, fulcra minute ; scales 

 well-developed, with oblique 

 sculpturing Palceoniscns (p. 476). 



Fins small, fulcra absent ; scales very 



thin, with oblique sculpturing . . Apateolepis (p. 486). 



Trunk much elongated ; scales nar- 

 row and very thin Actinophorus (p. 486). 



Dorsal fin in advance of anal; 

 laniary teeth well-developed. 



Fins large, with fulcra ; pectoral fin- 

 rays all articulated ; scales large 

 or of moderate size, slightly 

 overlapping, obliquely sculp- 

 tured JElonichthys (p. 487). 



Fins large, with fulcra ; pectoral fin- 

 rays unarticulated (?) ; dorsal 

 and anal fins short-based ; scales 

 large, thick, deeply overlapping, 

 obliquely sculptured Acrolepis (p. 501). 



Fins large, with fulcra ; pectoral fin- 

 rays unarticulated, except dis- 

 tally ; anal fin much extended ; 

 operculum relatively narrow 

 and deep ; scales large, thick, 

 well overlapping, obliquely 

 sculptured Gyrolepis (p. 510). 



