﻿lower surface of the head forms an enormous suctorial disc. 

 Ventrals with i8 — 21 rays. Dorsal and anal short. Scaly with 



Fig. I Upper, lateral and ventral view of Gastrotnyzon bornccnsis Gthr. X 2. 

 a. lateral extension of the abdominal skin. 



exception of head and lower surface. Branchial openings small, 

 above base of pectorals. 



Distribution: Borneo, in mountain streams. 



Key to the species. 



1. Breadth of body 3.2 in length. Ventrals reaching anal. G. borneensis p. 3. 



2. Breadth of body 5 in length. Ventrals far remote 



from anal G. nieuwenhuisi p. 4. 



I. Gastromyzon borneensis Gthr. [Fig. i]. 



Gastromyzon bornccnsis Giinther, Ann. Mag. Nat. Hist. (4) XIV. 1874, p. 454. 

 Lepidoglanis monticola Vaillant, Compt. rend. Congres intern. Zool, 1889, p. 8l. 

 Gastromyzon monticola Vaillant, Compt. rend, sommaires Soc. Philom. de Paris 



nO. 2, 9 Nov. 1891. — Nouv. Arch. Mus. Hist. Nat. (3) V. 1893, p. 94. 

 Gastromyzon borneensis Steindachner, Abh. Senckenb. Naturf. Ges. XXV. 1901 , p. 455. 



