287 
pressible teeth and few smaller outer fixed teeth. 
1 
\ 
r 
JL_. sectoral rays 2 or 3; ventral 7j barbel unbranched. 
1 
!• EUSTOMIAS. Second premaxillary fang not longer than first, separ 
aued by rather wide gap; pectoral rays 3; lateral photophores 
partly in pairs, £b souris. 
j_. HOMINOSTOMIAS. Second premaxillary fang generally longer than 
first, separated by relatively narrow interspace; photophores 
evenly spaoed. 
1 
k. Pectoral rays 3. 
1 
1. Barbel with 2 bulbs. 
—mm ► 
1 
,m. BarDel with long tapering terminal appendage, generally un— 
branched except basally.'i • 
1 
n. Teminal appendage without filamentous branches 
bibulbofius.. 
2 --- 
■n. Terminal appendage with 1 to 3 simple filaments near base 
0 
bituberatus. 
3 - 
n. Teminal appendage with 4 to 8 filaments near base, which 
beaded or with terminal swellings 
micraster. 
2 . —- 
m. Barbel with branched terminal appendage. 
1 . . 
o Teminal appendage at least half of head, with 2 to 4 main 
—— 
branches in terminal half bimargaritatus. 
2 ~ 
jo Terminal appendage less than 1/3 of head, richly branched 
3 
m. 
arborifer ♦ 
Barbel with 5 to 8 pigmented filaments at end of terminal 
bulb 
