46 gangetic fishes Order IV. 



over the head are many little tubercles, which, on the lower 

 parts, are white or bluish. The dorsal fins are beautiful : the 

 first is yellow, with bluish spots, and the second is dusky, with 

 incomplete belts of white and blue, edged with black. The 

 pectoral and tail fins are edged with black. 



The head is wider than the body. The under jaw, which 

 wants a lip, has, in its middle, a protuberance containing two 

 erect teeth. On each side of this protuberance are many teeth, 

 parallel and near to each other, and projecting forward. In the 

 upper jaw are about six sharp teeth, remote from each other. 

 The upper lip is pendulous, and on each side has a sharp pro- 

 jection. The tongue and palate are blackish. The gill membrane 

 on each side contains three rays. 



The scales on the head and back are remote from each other, 

 and circular ; on the sides and belly they approach near, and 

 are quadrangular ; on the tail they are imbricated. There is 

 no lateral line. 



The first dorsal fin is rounded, the two outer rays being the 

 shortest, and the one in the middle the longest. It is more 

 than twice the length of the rays of the second fin ; and all 

 exceed the membrane by about a third of their length. The 

 first five rays in the second back fin are undivided, the next 

 seventeen are divided into two, and the last four are more 

 subdivided. The pectoral fins are indented on the edge, each 

 containing seventeen bifid rays. The ventral fin forms a kind 

 of oblique hood, nearly circular : one ray on each side is 

 simple, the others are compound. The fin of the tail has 

 seventeen rays, of which some of the lower are very short. 



5th Species. — Gobius septemradiatus. 

 A gobius with the pectoral fins inserted on a muscular pro- 

 tuberance, and with seven short rays in the first dorsal fin, 



