EUGXATHIILE. 
285 
Family EUGNATHIDiE. 
V 
Trunk fusiform or elongate, not much laterally compressed. 
Cranial and facial bones moderately robust, externally enamelled, 
and opercular apparatus complete; mandibular suspensorium nearly 
vertical or inclined backwards, and gape of mouth wide : snout not 
produced; premaxillae in contact mesially and usually seoarate ; 
marginal teeth conical, and larger than the inner teeth. Xotochord 
usually persistent, the vertebrae very rarely more than incomplete 
rings. Fin-rays robust, articulated and divided distally ; fulcra 
conspicuous. Dorsal fin short and acuminate. Scales rhombic, 
sometimes with rounded postero-inferior angle. 
Synopsis of Genera. 
I. Vertebral ossifications wanting or in form 
of separate pleurocentra and hypocentra, 
sometimes fused into rings. 
(«) Scales thick. 
Trunk more or less elongated ; marginal 
teeth large, inner teeth minute and 
clustered; dorsal fin in advance of 
anal: caudal fin forked ; scales pec¬ 
tinated, not deepened on flank, 
narrow ventrally . 
Ditto, but trunk deeper, vertebral ele¬ 
ments usually more robust, and teeth 
smaller . 
Trunk robust; dorsal fin in advance of 
anal : caudal fin forked : flank-scales 
not much deepened, ventral scales 
nearly or quite as deep as broad .... 
Trunk elegantly fusiform ; external bones 
highly ornamented with ridges; mar¬ 
ginal teeth very small and regular; 
dorsal fin in advance of anal; caudal 
fin forked ; scales all narrow and 
elongated, marked with longitudinal 
furrows . 
( b ) Scales thin. 
Caudal pleurocentra and hypocentra 
never annular ; marginal teeth large, 
splenial teeth smaller, but long, 
slender and clustered; dorsal fin in 
advance of anal; caudal fin forked ; 
scales tuberculated and most with 
peg-and-socket articulation . 
Eugnathus (p. 286). 
Heterolepidotus (p. 804). 
Allolepidotus (p. 315). 
Ptycholepis (p. 316). 
Osteorachis (p. 324). 
