﻿ACTTNOPTERYGII. 



whioh is here regarded as a highly specialized ally of the family 

 destitute of squamation on the flanks. 



Synopsis of Genera. 



Trunk deeply fusiform ; paired fins large ; scales 



much imbricated; teeth rounded, tritoral. . Eurynotus (p. 528). 



Trunk very deeply fusiform; paired fins well 

 developed ; scales slightly imbricated ; teeth 

 styliform, but tumid Mesolepis (p. 531). 



.is Mesolepis, but teeth rounded, tritoral, in part 



pedunculated Globulodus (p. 534). 



Trunk very deeply fusiform; scales much im- 

 bricated ; dorsal and anal fins relatively 

 short and small Wardichthys (p. 535). 



Trunk rhombic ; pectoral fins insignificant, pelvic 

 fins absent ; scales very deep and slightly 

 imbricated; margin of mouth toothless, 

 pterygoid and splenial with two denticu- 

 lated longitudinal ridges Cheirodus (p. 535) . 



As Cheirodus, but trunk very deeply fusiform 



and rounded, and pelvic fins present Cheirodopsis (p. 540). 



Trunk rhombic or very deep and rounded ; paired 

 fins small ; scales very deep, slightly imbri- 

 cated ; marginal teeth feeble, styliform, 

 those within tubercular Platysomus (p. 541). 



f « : l (TK. &<z^ '■ Genus EURYNOTUS, Agassiz. 

 [Poiss. Eoss. vol. ii. pt. i, 1835, p. 153.] 



Syn. Plectrolepis, L. Agassiz, ibid. 1844, p. 306 (name only). 



Trunk deeply fusiform, the dorsal contour more or less angulated 

 at the origin of the dorsal fin. Frontal profile of head sharply 

 angulated immediately in advance of the orbit ; head and opercular 

 bones externally striated ; teeth rounded and obtuse, closely 

 arranged in irregular series on the splenial, dentary, maxilla, and 

 bones of the roof of the mouth. Fin-rays closely articulated and 

 distally bifurcating ; fulcra present on all the fins. Pectoral fins 

 relatively large and acutely pointed; pelvic fins well developed. 

 Dorsal fin very long, extending from a point in advance of the 

 middle of the trunk to the base of the caudal pedicle, high and 

 acuminate in front, low and fringe-like behind : anal fin acuminate, 

 with short base-line, opposite the hinder part of the dorsal ; caudal 

 fin deeply cleft, inequilobate. Scales smooth or feebly ornamented, 

 usually with serrated hinder border, and having a broad overlapped 



