426 
ACTINOPTEKTGII. 
Synopsis of Extinct Genera and Genera represented by 
Extinct Species, 
I. Trunk deepened, and extended dorsal fin con¬ 
tinuous. 
Paired fins small; dorsal fin deep in front; 
anal fin about half as much extended as 
dorsal; caudal fin forked; thickened 
yentral ridge-scales. 
Pelvic fins very large ; dorsal fin excessively 
deepened in front; anal fin much ex¬ 
tended, low and fringe-like ; caudal fin 
slightly forked; no enlarged scales .... 
Paired fins moderate ; dorsal and anal fins 
much deepened in front; caudal fin 
rounded or truncate ; no enlarged 
scales. 
Paired fins small j dorsal and anal fins not 
much elevated, about equally extended ; 
caudal fin rounded; no enlarged scales.. 
Pelvic fins with 2 or 3 much-elongated rays ; 
few anterior dorsal fin-rays much elon¬ 
gated ; anal fin low and fringe-like; 
caudal fin rounded or truncated; no 
enlarged scales . 
One pelvic fin-ray excessively elongated ; 
dorsal and anal fins low and about equally 
extended ; caudal fin truncated or slightly 
forked; no scales . 
II. Trunk elongate-fusiform, and spinous portion 
of dorsal fin separate. 
Teeth minute; preoperculum not serrated ; 
posterior dorsal and anal fins of equal 
extent, latter with 2 free spines ; caudal 
fin forked ; scales enlarged along lateral 
line . 
Apparently as Caranx, but no scales . 
As Caranx, but anal fin shorter than pos¬ 
terior dorsal, and no enlarged scales.... 
Teeth larger; anal fin less extended than 
posterior dorsal and its anterior spines 
not free j no enlarged scales. 
Preoperculum serrated j anal fin less extended 
than posterior dorsal; no enlarged 
scales ... 
Aipichthys (p. 427). 
Semiophorus (p. 430). 
Platax (p. 432). 
Amphistium (p. 434). 
Vomeropsis (p. 435). 
Mene (p. 437). 
Caranx (p. 441). 
Archmus (p. 442). 
Seriola (p. 444). 
Carangopsis (p. 446). 
Ductor (p. 448). 
