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I. Paracrossochilus vittatus (Blgr.). 



Crossochilus vittatus Boulenger, Ann. Mag. Nat. Hist. (6) XIII. 1894, p. 247. 

 Paracrossochilus bicortvis Popta, Notes Leyden Mus. XXIV. 1902 — 04, p. 201. — 

 Ibid. XXVII, 1906, p. 122. 



3^ 

 D. 2.8; A. 2.5; P. 1. 14 -15; V. 1.7—8; L. 1. 28—29; L.tr. i . 



Height about 5 to 5.2, about 6 to 6.5 in length with caudal. 

 Head 4.5 to about 5, 5.6 to 6 in length with caudal. Eye 4 — 472> 

 1.7 to almost 2 in interorbital space and twice in snout. In 

 some specimens (males ?) on each side of the snout, near its 

 extremity, a conical pointed horny tubercle. Rostral barbels 

 somewhat smaller than eye, maxillary barbels still shorter. 

 Origin of dorsal opposite to loth scale of lateral line, separated 

 by 10 scales from occiput. Dorsal slightly emarginate, its height 

 equal to length of head. Origin of anal opposite to 2ist scale 

 of lateral line. Ventrals and pectorals subequal. Ventrals not 

 reaching anal, their origin separated by 2 series of scales from 

 the II th scale of lateral line. Pectorals nearly equal to head. 

 Caudal bifurcate, its lobes slightly pointed, equal to or slightly 

 longer than head. Least height of caudal peduncle about twice 

 in head and more than i'/2 times in its own length, surrounded 

 by 8 — 9 scales. Brown above, yellowish below. A broad lateral 

 longitudinal brown band. Fins hyaline, with a dark hue. Each 

 lobe of caudal with an intramarginal dark band. Length 74 mm. 

 [Type of Cr. vittatus Blgr. and P. bicornis Popta in the British 

 and Leiden Museuniseen by usj. 



Norn indig. : Seluwang howong, Tulum (Howong). 



Habitat: Borneo (river Howong, one of the tributaries of 

 river Mahakam !, Upper Kapuas, Sarawak in rivers Senah, 

 Poeh and Tagora). 



26. Discognathus Heckel. 



(Heckei., Russeggei's Reise I. 2. Theil, 1843, p. 1027). 



Oblong, dorsal surface slightly convex. Ventral surface of 

 head and body flattened. Snout prominent, obtusely rounded, 

 more or less depressed, with horny tubercles and a superficial 

 or deep horizontal furrow. Upper lip broad, covered by soft 

 round papillae, its free border crenulated, carrying a barbel, 

 where it passes over in the lower lip; it overhangs a vestibulum 

 of the mouth. Lower lip modified into a suctorial disk, with 

 a narrow anterior and a broad rounded posterior margin, both 



