225 



it is connected, an involuted prolongation, situated in the lateral 

 part of the postlabial groove; this groove is divided in a 

 median and two lateral parts by two fleshy prolongations, 

 broadly originating from the isthmus and tapering towards the 

 lower lip. No barbels. Eye with a free orbital margin. Simple 

 rays of dorsal totally or partly ossified, with 9 branched rays 

 and originating far in advance of the ventrals. Anal short, 

 with 5 branched rays. Caudal emarginate. Ventrals and pec- 

 torals horizontal. Scales rather small. Lateral line straight, 

 running in the middle of the tail. Branchial openings rather 

 narrow, their superior part not covered by the opercular flap, 

 but forming a vertical oval opening, closed at the inside by a 

 moveable velum. Gillmembranes broadly united with the isthmus. 

 No pharyngeal teeth. 



Distribution: One species from Borneo and one from 

 Siam, in mountain streams. 







i. Gyrinocheilus pustulosus Vaillant. 



Gyrinocheilus pustulosus Vaillant, Notes Leyden Mus. XXIV. 1902, p. in. 

 Gyrinocheilus pustulosus Popta, Notes Leyden Mus. XXVII. 1906, p. 180. 



_8 



0.3.9; A -3-5; P. 1-14; V. 1.8; L. 1.40 41; L. tr. T. 



about 12 



Height 4 5.2, 5 6.4 in length with caudal. Head 3.6 3.8, 

 4.6 4.7 in length with caudal. Eye 6.7 10, 3.7 6 in snout, 

 2.5 3.8 in interorbital space. Origin of dorsal opposite to iith 

 scale of lateral line. Dorsal nearly truncate, shorter than head. 

 Origin of anal opposite to 3i st scale of lateral line. Height of 

 anal equal to that of dorsal. Origin of ventrals separated by 

 4 scales from i8* n scale of lateral line, opposite to 5th branched 

 ray of dorsal. Ventrals shorter than pectorals, which are some- 

 what shorter than head. Caudal emarginate, the lobes rounded, 

 about equal to length of head. Least height of caudal peduncle 

 6 2 / 3 in length of head, about equal to length of caudal peduncle, 

 surrounded by 16 scales. In immature specimens irregular 

 series of black blotches on the back and on the flanks, in 

 adult specimens a broad darkish longitudinal band along the 

 sides. Length 355 mm. 



Norn, in dig.: Telure (Bo). 



Habitat: Borneo (river Kapuas: mouth of river Raun and 

 Upper Sibau, river Bo! affluent of river Mahakam). 



INDO-AUSTRALIAN FISHES III. 15 



