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 II. 6; A. 4. 10 II; P. I. 79; V. I. 5. 



Height about 4 472, head 3 2 / 3 to about 4, eye 8'/ 2 n, 

 situated about in the middle of head, about 3 4 in the 

 interorbital space. Nasal barbels short, 2 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 i ! / 2 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 / 7 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 i ! / 3 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, Bluu, 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 



