﻿55 



lotong); Java; Borneo ( 

 Sriang, river Kahajan 

 Mahakam : Batu Pangal !, river B6; river Baram). — Siam. 



river Kapuas : Pontianak, Sintang; Danau 

 , river Pengaron, Banjermassin, river 



5. Rasborichthys Bleeker. 



(Bleeker, Ichth. Arch. Ind. Prodr. II. Cypiini, i860, p. 456). 



»Elongate, or oblong and rather elevated, compressed. A 

 median keel between base of ventrals and anus. Head pointed. 

 Mouth anterior, obliquely ascending, narrow, not extending 

 to below eye. Lips thin, no barbels. Praeorbital triangular, its top 

 directed upwards, suborbitals narrow. Eye large, with broad 

 gelatinous eyelids. Dorsal with 7 branched rays, above the space 



Fig. 24. Rasborichthys helfrichi (Blkr.). X %• 



between ventrals and anal. Anal many rayed, much longer than 

 dorsal. Scales moderate or small, thin, more or less deciduous. 

 Lateral line curved, running along the middle of the tail. Pseudo- 

 branchiae present. Gillrakers long, setiform, closely set. Gill- 

 opening ending below praeoperculum. Gillmembranes united 

 to isthmus. Pharyngeal teeth 1.3.5 — 5.3.1. 



Distribution: Sumatra, Borneo and Singapore. 



Key to the species. 



1. L. 1. 36 — 38. Lower jaw included R. altior p. 55. 



2. L. 1. 55 — 60. Lower jaw pominent R. helfrichi p. 56. 



I, Rasborichthys altior Reg. 



Rasborichthys altior Regan, Ann. Mag. Nat. Hist. (8) XI. 1913, p. 394. 



8J- 



D. 2.;; A. 1. 17; p. 1. 13; V. 1.6; L. 1.36— 38; L. tr. ]^. 



7 

 Oblong, rather elevated. Height 2.8 — 3, 3.5 in length with 

 caudal; head 4.5 in length with caudal. Eye 3 — 372? slightly 



