290 
£U Barbej. stem with at least 1 posterior branch, usually with 3, median orig¬ 
inating from between 2 lateral; front fangs fixed on depressible, followed 
by series of depressible teeth and few small fixed teeth. ' 
1 , 
x. TRICHOSTOMIAS. Pectoral rays 6 or 7; ventral 8; 
, front fangs depressible; babbel with 3 branches. 
1 
_ • 
Z* Branches long, slender, divided terminally 
dreohseli* 
2 --— 
Z* Median branch divided terminally; lateral branches 
simple filaments 
furcifer. 
Z* Median branch undivided, with terminal bulb; later¬ 
al branches simple filaments 
tenisoni* 
2 -— 
x# Dlr®'I/iT0CEIRUS. Pectoral rays 2, well developed; 
ventral 7; front fangs fixed either above or below, 
usually in both -laws# 
1 
z# Barbel with 3 branches* 
aa. Lateral branches undivided. 
1 
bb* Bulb small; lateral branches long 
~ 2 
bb* Bulb large, with terminal filaments; lateral branches moderate 
parvibulbu w, 
bb* Bulb large, without filaments 
2 
bigelowi * 
triramis* 
Lateral branches bifid or at least each with well developed secondary 
branch* 
1 
QQ • Stem terminal .to origin of branches translucent, yrith pigmented axis 
dd* Branches moderate paucifilis. 
