528 
ACTINOPXERYGrII. 
which 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. . 
Trunk very deeply fusiform; paired fins well 
developed; scales slightly imbricated ; teeth 
styliform, but tumid. 
As Mesolepis , but teeth rounded, tritoral, in part 
pedunculated... 
Trunk very deeply fusiform; scales much im¬ 
bricated ; dorsal and anal fins relatively 
short and small. 
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 .*..:. 
As Cheirodus, but trunk very deeply fusiform 
and rounded, and pelvic fins present . 
Trunk rhombic or very deep and rounded ; paired 
fins small; scales very deep, slightly imbri¬ 
cated ; marginal teeth feeble, styliform, 
those within tubercular . 
& 
S 
(J- ii** 
r- 
*rH> 
Eurynotus (p. 528). 
Mesolepis (p. 531). 
Glohulodus (p. 531). 
Wardichthys (p. 535). 
Cheirodus (p. 535). 
Cheirodopsis (p. 540). 
Platysomus (p. 541). 
Genus EURYNOTUS, Agassiz. 
[Poiss. Foss. 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 flus 
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 
