CLASS IV. ORDER IV. 87 
scales small, deciduous ; air-bladder hard or bo- 
ny. 
AwnaBLeps, head subdepressed ; mouth termi- 
nal; teeth small, on the jaws ; eyes protuberant, 
with double pupils 5 gill-membrane six-rayed. 
Amira, head bony, naked, rough, with visible 
sutures ; teeth both in jaws and palate, close-set, 
sharp, numerous ; cirri or beards two, near the 
nostrils ; gill-membrane twelve-rayed ; body sca- 
SiLurus, head large, depressed ; mouth wide, 
bearded by long tentacula ; body lengthened, na- 
ked ; first ray of the pectoral-fins, or of the first 
dorsal-fin, toothed backwards. 
Priatysracus, habit as Silurus;: mouth be- 
neath, bearded with cirri; body scaleless, depress- 
ed; tail long, compressed. 
Loricania, habit as Silurus ; body mailed. 
SALMo, (salmon, trout,) head smooth, compress- 
ed ; tongue cartilaginous ; teeth both in the jaws 
and on the tongue ; gill-membranc from four to ten- 
rayed ; body compressed, furnished at the hind 
part with an adipose fin. 
AcantTuonotus, body elongated, without dor- 
gal-fin ; spines sevoral on the back and abdomen. 
Fistuvaria, (tobacco-pipe, trumpet-fish, ) snout 
cylindric; mouth terminal; body lengthened : 
zill-membrane seven-rayed. 
Ksox, (sea-pike, gar-fish,) head somewhat flat- 
tened above ; mouth wide; teeth sharp, in the 
jaws, palate and tongue ; body lengthened ; dor- 
sal and anal-fin (in most species) near the tail and 
opposite to each other. 
Poryrrervs, gill-membrane single-rayed ; dor- 
sal-fins numerous. 
