Pimelodus. gangetic fishes. . 169 



terminating in a substance like whalebone, and indented on 

 both edges, and the others are branched. The second fin is 

 almost as long as that of the vent, and rises gradually to the 

 end, where it is rounded above, but sharp below. The pectoral 

 fins are shorter than the head, and low : each contains twelve 

 rays, of which the first is a prickle like that of the back ; the 

 others are branched. The ventral fins are shorter than the pec- 

 torals, and near each other : each contains six rays, of which 

 the first is undivided. The fin behind the vent is nearly triangu- 

 lar, sloping much, both before and behind, from the sixth ray, 

 which is the longest ; the first five are undivided. The fin of the 

 tail is divided into two lobes, of which the upper is rather the 

 longest and sharpest : it contains eighteen distinct rays, besides 

 some short ones on each side. 



6th Species. — Pimelodus sagor. 

 A Pimelodus with six tendrils, rather shorter than half the fish, 

 with the fin of the tail divided into two lobes, with nine rays 

 in the back fin, which has no elongation beyond its membrane, 

 but its prickle indented on both edges ; with eighteen rays in 

 the fin behind the vent ; and with opaque sides transversely 

 barred above the lateral line, which is single. 



The Diddi Jellah of Dr Russell {Indian Fishes, Vol. II. No. 

 169) is very like the Sagor, but has two lateral lines on each 

 side. The Silurus Herzbergii of Bloch (Ichth. Tome XL p. 24, 

 PI. CCCLXVII.) has also a considerable affinity to the Sagor, 

 but differs in colours, being brown above and silver below, and 

 also in having only thirteen rays in the fin behind the vent. 



The Sagor is found along with the Gagora, is nearly of the 

 same size, and the two differ more in appearance than in struc- 

 ture. So like in this respect are they, that here 1 shall only men.- 



Y 



