351 
series larger. Brownish, with a diffuse irregular cephalic, dorso- 
anal and caudal cross band. Fins brownish. Length 240 mm. 
[After Bleeker, not seen by us]. 
Habitat: Sumatra (river Enim, river Si Russu, Djapura); 
? Borneo (Mahakam river: Lezocass¢s macropterus Vaillant). 
In rivers. 
4. Leiocassis Bleeker. 
BLEEKER, Ichth. Arch. Ind. Prodr. I Siluri, 1858, p. 139). 
? ’ ’ 
More or less elongate and robust. Head more or less flattened 
above, covered by skin or headshields naked. Occipital process 
touching the basal bone of dorsal spine, or free from it, or 
both united by a separate shield. Snout more or less promi- 
nent, above the slightly curved mouth. Eye covered by skin. 
8 barbels. Dorsal short, its pungent spine with the hindborder 
smooth or weakly or strongly serrated, the teeth directed down- 
ward. Adipose fin as long as or longer than dorsal, opposite 
to anal, which has less than 20 rays. Pectorals with a strong 
spine, conspicuously denticulated behind. Caudal deeply bifur- 
cate. Anal with less than 20 rays. Villiform teeth in curved 
bands in the jaws and on the palate. Gillmembranes nearly 
totally separated, free from isthmus. Branchiostegals 9—1I1. 
Symopsisvof ithe species 4), 
I. Head covered with smooth skin. 
A. Dorsal spine less than '!/3 length of head; maxil- 
lary barbel reaching pectoral. 
i Depth of bodys) iny the lenethh., <<). =, L. fuscus p. 353. 
2 Wepthvor body 6 in the length... 4.5 «< L. mahakamensis p. 354. 
#. Dorsal spine at least 2/; length of head. 
1. Maxillary barbel reaching pectoral; head nearly 
SNES ng he) nia es is ee « L. stenomus p. 355. 
2. Maxillary barbel not extending beyond head, 
which is longer than broad, 
a. Occipital process reaching basal shield of 
ROS Cn Say Se a ee L. poecilopterus p. 356. 
6, Occipital process not reaching basal shield 
of dorsal spine. 
1) After Tate Regan, Ann. Mag. Nat. Hist. (8) XI. 1913, p. 548. 
