95 
Length over 360 mm. [Specimen of Bleeker’s collection in the 
Leyden Museum examined]. 
Habitat: Java (Krawang!); Borneo (Sambas, Pamangkat 
Sarawak). 
In rivers and brackish water. 
5. Ophisthopterus Gill. 
(GiLL. Proc. Acad. Nat. Sc. Philadelphia 1861, p. 31). 
(Pristigasiey Gthr: p. p-*): 
Oblong, strongly compressed, ventral profile strongly serrated, 
especially convex between chin and pectorals. Lower jaw pro- 
jecting, maxillary vertical, rounded behind, reaching farther 
than its supplemental bone but not produced. Small teeth on 
jaws, palatines, pterygoids and tongue, none on vomer. Dorsal 
fin short, inserted far behind origin of anal. Anal long with 
more than 50 rays. Ventrals wanting. Caudal deeply forked. 
Scales moderate, thin, deciduous. Gillrakers 28—30, stout, 
much longer than branchial filaments. 
Synopsis of the species. 
A, Maxillary twice in head, supplementary bone rea- 
ching as far as maxillary (see fig. 31). Pectorals 
Gontee waein Ingle So oe 4 ODD Onn Ooo o oso O. tartoor p. 95. 
B. Maxillary 11/,—14/,; in head, excluding the supple- 
mentary bone totally from the caudal border of 
the upper jaw (see fig. 32). Pectorals longer than 
[Gah aa’ SR ic GB ve Seton CMD EOMOMOn oot” Ciesiaope: amr O. macrognathus p. 96. 
I. Opisthopterus tartoor (C. V.) 
Fi oe saci oy oe ab Sties sh hoo Ke eal See tents - 
RN DON NY NARNIA 
er mn YORE 
Fig. 31. Opisthopterus tartoor (C. V.) 
i Intermaxillary, #2 maxillary, / ligament between them, ss’ supplemental bones. 
1) See Max Weber & L. F. de Beaufort, Verhand. Akademie Amsterdam 
BEV LLS ING 3, fOT2) pe 9. 
