168 SILURIDJS. 



tJie base of the occipital process ; occipital process triangular, with 

 the lateral margins straight, longer than 

 broad, and with a slight keel along the middle. ^ — ^ 

 Each half of the intermaxillary band of teeth 

 is twice as broad as long ; no teeth on the 

 vomer ; the palatine teeth are granular, 

 placed far backwards, in two convex, oblong- 

 ovate patches convergent behind. The max- 

 illary barbels extend to the end of the head. 

 Dorsal fin much higher than the body ; its 

 spine is strong and long, five-sixths of the length of the head, finely 

 serrated along both edges. Adipose fin very short, but rather high, 

 deep black in its upper half. Caudal deeply forked. The pectoral 

 spine is nearly as long as the head, and extends beyond the vertical 

 from f he last ray of the dorsal fin. 



Siam. 

 a. Seven and a half inches long. Purchased of Mr. Jamrach. 



54. Arius gagora. 



Pimelodus gagora, Ham. Bueh. pp. 167, 376. pi. 10. fig. 54. 

 Arius gagora, Cum. fy Vol. xv. p. 99 ; Bleek. Verh. Bat. Gen. xxv. 

 Bengal, p. 119. 



D. 1/7. A. 18-19. P. -^ Vert. 16/19. 



The length of the head is two-ninths of the total length (with the 

 caudal) ; it is broader than high, its greatest width being three- 

 quarters of its length. The occipital process is granular, longitudi- 

 nally keeled, as broad as long. The maxillary barbels extend some- 

 what beyond the head. The teeth on the palate are granulai, and 

 form two separate oblong- triangular patches. Dorsal fin higher 

 than the body ; its spine is strong, serrated along both edges, and 

 three-quarters or two-thirds of the length of the head ; pectorals 

 rather shorter than the head, their spine being somewhat longer than 

 that of the dorsal fin. Adipose fin with a large blackish spot. 



Ganges. 



55. Arius falcarius. 



? Tachisurus chinensis, Lacep. v. p. 151. pi. 5. fig. 2. 



? Pimelodus tachisurus, Cut: 8f Vol. xv. p. 163. 



Arius falcarius, Richards. Voy. Sulph. Fish. p. 134. pi. 62. figs. 7-9. 



Bagrus crinalis, Richards. Ichth. Chin. p. 282. 



Pimelodus mong, Richard*. Ichth. Chin. p. 286. 



Arius schlegelii, Bleek. Nederl. Tydschr. Dierk. 1863, p. 146. 



D. 1/7. A. 18-19. P. .1/11. Vert. 18/27. 

 The height of the body is one-fifth or a little more than one-fifth 

 of the total length (without caudal), the length of the head one-fourth 

 or two-sevenths. Head rather broader than high. The snout is 

 much longer than the eye, the diameter of which is one-fifth or one- 

 seventh of the length of the head, and one-third or one-fourth of the 

 width of the interorbital space. The teeth on the palate are granular, 



