268 
Glyptosternum laak Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 190. — 
o.c. XXVII. 1906, p. 71. 
Glyptosternum tiong Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 191. — 
o.c. XXVII. 1906, p. 75. 
D. I—11. 6; A. 4. 10—11; P. I. 7—9; V. I. 5. 
Height about 4—4'/,, head 37/, to about 4, eye 8'/,—1II, 
situated about in the middle of head, about 3—4 in the 
interorbital space. Nasal barbels short, 2—2'/, times diameter 
of eye and not reaching it. Maxillary barbels extending to or 
reaching a little farther than base of pectorals, mandibulary 
barbels surpassing the gillmembrane, the mental ones a little 
shorter. Occipital process 3 times longer. than broad. Dorsal 
and adipose fin equally long. The interspace between these 
fins is about 1'/,—2 their length and in that interspace may 
be visible, according to the mode of preservation, 5—6 tubero- 
sities, corresponding to the end of the dorsal processes of the 
underlying vertebrae. The height of dorsal is about °/, the 
length of the head, its spine is somewhat shorter, the hind- 
border of which is more or less denticulated. Ventrals shorter 
than pectorals, their origin below or slightly behind end of 
base of dorsal. Pectorals reaching to ventrals or nearly so, 
their spine very large, flat, strongly denticulated behind, some- 
what shorter or about as long as the dorsal. Axillary pore 
present. Caudal deeply forked, about as long as head. Least 
part of caudal peduncle 1'/,—2 times, its length. Colour greyish 
or reddish marbled or clouded with brown or yellow and 
freckled with black. Belly and underside of head and _hind- 
border of fins yellowish. Length 144 mm. [Types of Vaillant 
and Popta seen in Leyden Museum]. 
Nomen indig.: Laak (riv. Howong); Siken (riv. Bo); Tiong 
(riv. Kajan). 
Habitat: Borneo (rivers Howong, Bo, Kajan, Blut, Sebruang, 
Senah, Tagora and Baram). 
In rivers. 
2. Gagata Bleeker. 
(BLEEKER. Ned. Tijdschr. Dierk. I. 1863, p. 90). 
(Callomystax Giinther). 
Compressed. Mouth small, transverse at the lower side of 
the snout. The intermaxillaries and mandibularies being short, 
small. Upper surface of head with sharp longitudinal ridges 
in 
