350 
REPORT OF COMMISSIONER OF FISH AND PISHERIES. [8] 
sharply but finely serrate ; gill-rakers 
very small, thickish; pores and slits 
on snout obsolete. (Fluviatile spe- 
CIES Saeco ee eee PACHYURUS, 15. 
cc. Lower jaw with one or more barbels, either at the symphysis or on the rami; 
snout with slits and pores as in Sci- 
wna; lower jaw included; preorbital 
broad ; lower teeth in villiform bands ; 
gill-rakers more or less short. 
p. Pseudobranchie well developed; pectoral fin not 
elongate. 
q. Lower jaw with slender barbels, usually several 
in number. 
7. Barbels mostly in a tuft at the symphysis of 
lower jaw; mouth very small, infe- 
rior; gill-rakers minute, thickish; 
dorsal spines 10 or 11. 
8. Preopercle sharply but finely serrate ; preor- 
bital turgid and cavernous, more or 
less translucent; caudal fin rhom- 
bie. (Fluviatile species.) 
PACHYPOPS, 16. 
ss. Preopercle without bony serre; preorbital 
very broad, but less distinctly cavern- 
ONSwee ita. Sei ae POLYCIRRHUS, 17. 
‘rr. Barbels chiefly lateral, along the rami of the 
lower jaw, usually none at the 
symphysis; lower pharyngeals 3 nar- 
row with sharp teeth. 
t. Preopercle without bony serre; dorsal 
spines 14; gill-rakers short, but 
rather slender .. ... GENYONEMUS, 18. 
ti. Preopercle with its bony margin armed 
with strong teeth ; dorsal spines 10 
or 11; gill-rakers short, thickish. 
' Micropogon, 19. 
qq. Lower jaw witha single thickish barbel at its tip. 
u. Air-bladder large; analspinestwo; back 
more or less elevated ; preopercle with 
its bony margin crenate or serrate ; 
pectorals short, shorter than ventrals. 
(Free-swimming species. ) 
UMBRINA, 20. 
uu. Air-bladder none; anal spine single, 
weak; back not elevated ; preopercle _ 
with its membranaceous edge crenu- 
late; pectoral fins long, longer than 
ventrals. (Bottom fishes. ) 
MENTICIRRHUS, 21. 
pp. Pseudobranchiw obsolete; body long and low; 
caudal pointed ; pectoral fin elongate ; 
preopercle without bony serratures. 
v. Chin without barbels; a row of slender 
barbels along inner edge of mandible; 
soft dorsal with about 30 rays. 
PARALONCHURUS, 22, 
