﻿Gastromyzon horneensis Fowler, Proc. Acad. Nat. Sc. Phil. (2) LVII. 1905, p. 477' 

 Gasti-oinyzon bormensis Popta, Notes Leyden Mus. XXVII. 1906, jd. 187. 



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D. 3.8; A. 1.6; P. 26— 28; V. 20— 21; L.l. circa 65; L. tr. j^. 



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Height 5. 5 or more, about 7 in length with caudal. Breadth 

 of body 3. 2 in length, 4 in length with caudal. Head 3 '/a; 

 dj'\^ to more than 5 in length with caudal. Eye 5. 5 — 8, 2. 5 — 4 

 in interorbital space, according to size; situated in the third fourth 

 of the length of the head. Mouthopening very slightly curved, 

 -/3 of the greatest breadth of the head. Upper lip concealed 

 by rounded frontborder of head, consisting anteriorly of three 

 oval portions, a larger median and two lateral ones; at the 

 outer corner of lastnamed a small barbel, an equally small 

 barbel on each side between the median and lateral one; they 

 are shorter than the eye. A smaller one on a fold at the corner 

 of the mouth, which is continued in the fringed lower lip. 

 Origin of dorsal nearer to root of caudal than to snout. The 

 anal reaches, when depressed, on caudal. Innermost rays of 

 ventrals reaching anal. Caudal about equal to head, obliquely 

 truncated. More or less dark brown, lower surface whitish. Head 

 and back may be uniform or have small brown spots, which 

 may form an irregular network. There may be narrow, yellowish 

 white, more or less regular, transverse lines on the hinderpart 

 of the body. Upper surface of pectorals and ventrals as also 

 the other fins with more or less distinct brown spots or bands. 

 Length over 100 mm. 



N o m e n i n d i g. : Dekot ok (Bongan), Tapat (Howong), Leket 

 or Ketipit (Kajan), Dehat (Mahakam). 



Habitat: Borneo (Upper Kapuas, Bongan, Upper Mahakam 

 with its affluents Bo, Bluu, Howong!, Kajan, source of the 

 Mingalong, Kadamaian river on Kina Balu, Mount Dulit). 



Living in mountain torrents. According to Giinther, they 

 dart rapidly across the swiftest currents from one .stone to 

 another, and stick like limpets to the stones, along which 

 they crawl slowly like a molluscous animal. 



2. Gastromyzon nieuwenhuisi (Popta). 



Neogastromyzon Nietiwoiliiiisii Popta, Notes Leyden Mus. XXV. 1905, p. 181. 

 — ibid. XXVII. 1906, p. 192. 



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D. 2.7; A. 2.5; P. 1.24; V. 18; L. 1. 90; L. tr. T. 



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