291 
2 
dd. Branches long, median more than twice long as main stem of barbel 
•silvescens. 
cc. Stem pigmented throughout. 
col 
ee . Median branch rather large bulb on short stem 
schmidti. 
2 
ee. Median branch slender, well developed macr onema. 
3 
ee. Median branch fine filament 
2 
z. Barbel with 1 branch. 
1 “ 
ff. Branch dividing into 4 bingh ami. 
“2 
ff. Branch ending in bulb bearing 2 long bifid branches 
« 
fissibarbis. 
3 
ff. Branch without bulb, bearing several branches 
dendriticus . 
4 . 
ff. Branch slender, simple, ends in small bulb 
monoclonus . 
3 
x. HEOSTOMIAS. Pectoral single well developed ray and 
sometimes minute second ray; ventral rays 7; front 
fangs depressible; barbel with 3 branches. 
1 
gg. Branches similar, long, slender, 4 or 5 luminous swellings on 
stem beyond branches t. et ranema. 
2 
gg. Median branches rather short, dissimilar in structure to lat¬ 
eral branches; 2 luminous swellings on stem beyond branches. 
1 
hh* Lateral branches rather short, divided nearly to base 
ranral o sus * 
2 . 
hh* Lateral branches long, undivided, oearing few filamentous 
