1240 Catalogue of Malayan Fishes. [Nov. 



of the ventrals. The extent of the adipose dorsal is \ of the anal, its 

 height £ of the longest rays of the latter. The caudal is deeply cleft, 

 the lobes equal, and their length, normally, like the dorsal spine. The 

 lateral line follows the outline of the back at the upper third of the 

 body ; arrived at the base of the caudal it continues a short distance 

 obliquely downwards over the three upper rays of the lower lobe. The 

 line consists of little separated tubes, each with a minute downwards 

 pointed process at the posterior part. The two superior branchioste- 

 gous rays on each side are very broad and exposed, so as to appear like 

 a subopercle. The stomach is capacious, thin, containing remains of 

 Crustacea and mud. The intestinal canal slightly exceeds double the 

 total length. The air-vessel is small but very thick transversely divided 

 in two compartments. The fish is held in esteem by the natives, but 

 at Pinang it is of so rare occurrence that the air-vessel contributes but 

 little to the general stock of Isinglass obtained from other species. 



Arius arius, (Buchanan Hamilton.) 



Pimelodus arius, Buchan. Ham. 170, 376. 



Arius arius, Cuv. and Val. XV. 102. 



Ikan Saludu or Surdudu. 



Adult. Head above and back intense steel-blue ; cheeks, opercles 

 and sides greenish golden or bronze ; throat and abdomen white slightly 

 dotted with black ; dorsal greyish white minutely dotted with black ; 

 filament of the spine and the upper margin black; caudal yellowish white 

 minutely dotted with brown ; anal and pectorals white, external half 

 so closely dotted with black as to assume that colour ; ventrals hyaline, 

 closely dotted with brown ; adipose pale greyish olive with a large 

 black spot, posterior margin white ; maxillary cirri blackish ; mandi- 

 bular pairs white. Iris greenish golden, orbital margin blackish. 



Young. Dorsal, posterior half of caudal, middle of anal and base of 

 adipose pale lake. 



D 1/7—1 (adipose), C 15|, A 18 to 21, V 6, P 1/10, Br. V. 



Cirri — 



4 



Habit. — Sea and estuaries of Pinang , Malayan Peninsula, Singa- 

 pore. 



Pondicherry, Gangetic estuaries, 

 Total length: 1 foot 10 inch. 





