426 
actinoptekygii. 
Synopsis of Extinct Genera and Genera represented by 
Extinct Species. 
I. Irunk deepened, and extended dorsal fin con- 
tinuous. 
1 aired fins small ; dorsal fin deep in front ; 
anal fin about half as much extended as 
dorsal ; caudal fin forked ; thickened 
ventral ridge-scales Aipichthys (p. 427). 
1 elvic 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 .... Semiophorus (p. 43 )• 
Paired fins moderate ; dorsal and anal tins 
much deepened in 'front ; caudal fin 
rounded or truncate ; no enlarged 
scales Platax (p- 432). 
Paired fins small ; dorsal and anal fins not 
much elevatod, about equally extended ; 
caudal fin rounded ; no enlarged scales. . Amphistium (p- 43 )• 
Pelvic fins with 2 or :i 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 Vomeropsis (p- 43f>h 
One pelvic fin-ray excessively elongated ; 
dorsal and anal fins low and about equally 
extended ; caudal fin truncated or slightly 
forked ; no scales Mene (p. 437). 
II. Trunk elongate-fusiform, and spinous portion 
of dorsal fin separate. 
Teeth minute ; preoperbulum not serrated ; 
posterior dorsal and anal fins of equal 
extent, latter with 2 free spines ; caudal 
fin forked ; scales enlarged along lateral 
line Caranx (p. 441). 
Apparently as Caranx, but no scales Arduous (p. 442). 
As Caranx, but anal fin shorter than pos- 
terior dorsal, and no enlarged scales. . . . Seriola (p. 444). 
Teeth larger ; anal fin less extended than 
posterior dorsal and its anterior spines . 
not free ; no enlarged scales Caranyopsis (p- 4 4 )• 
Preoperculum serrated ; anal tin less extended 
than posterior dorsal ; no enlarged 
scales Ductor (p. 448). 
