280 



much less than that of the soft dorsal and about 4 ! / 2 times 

 in its distance from that fin. Ventrals do not reach anal and 

 are much shorter than pectorals, the length of which is about 

 equal to head without snout, its flattened spine somewhat 

 shorter and stronger than that of the dorsal. 7 8 stout, short 

 gillrakers. Villiform teeth in an arcuate band in the jaws, 

 granular teeth far back on the palate in 2 oval patches, the 

 long axes of which converge hindward. Two small patches 

 in front on the palate, reduced to a few small teeth or even 

 wanting. Brownish above, whitish below. Outer half of fins 

 dusky. Length 460 mm. 



Nomen indig. : Ikan manjong (Malay. Batav.). 



Habitat: Java (Batavia) ; Sumatra (Moara Kompeh, Bagan 

 api api !) ; Borneo (rivers Kapuas and Baram, Balikpapan !, 

 Sandakan). 



In sea, estuaries and rivers. 



4. Arius polystaphylodon Blkr. 



Arius polystaphylodon Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, 



p. 172. 

 Ariodes polystaphylodon Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri 1858, p. 90. 



All. Ichth. II. 1862, p. 41. 



Arius polystaphylodon Giinther, Cat. Brit. Mus. V. 1864, p. 166. 

 Aritis polystaphylodon Max Weber, Siboga-Exp. Fische, 1913, p. 28. 



B. 6; D. I. 7; A. 1517; P. I. 12. 



Elongate, height 5, head about 3 ! / 2 , higher than broad, its 

 width i*/ 2 in its length. Hindpart of head rugous and some- 

 what granulate. Occipital process keeled, strongly elevated 

 transversally, with rough and strong granulations, oblong; its 

 margins irregularly convex in such a way that the hinder 2 /3 

 of the process forms a more or less triangular shield; the 

 truncate hindborder touches the basal bone of the dorsal spine, 

 which bone has winglike lateral extremities. The broad median 

 fontanel begins near the extremity of the snout, bordered in 

 its anterior half by 2 posteriorly divergent narrow bony crests, 

 in its posterior half, which is narrowed to a mere slit, it is 

 bordered by two broad, rounded crests, convergent to the base 

 of the occipital process. Humeral process rather long, triangular, 

 pointed and rugous. Dorsal profile sloping slightly down, with a 

 convexity above the opercles, to the somewhat pointed, slightly 

 prominent snout, the frontborder of which is rounded. Eye6'/ 2 > 



