48 gangetic fishes. Order IV. 



protuberance, with nine rays in the first dorsal fin, fourteen in 

 the second, and fifteen in that behind the vent. 



This little fish, like the last, has no tubercles on its scales 

 and scarcely any traces of the black coloured belts by which the 

 G. plinianus is distinguished ; but it has some white spots on 

 its lower parts. The first back fin is black edged with white, 

 with red membranes between the first three rays, and with 

 some intermixture of white behind. The second fin is white, 

 with two longitudinal black belts. On the centre of each pec- 

 toral fin there is a large rusty spot. 



The upper lip is double, the outer having on each side a 

 sharp projection, and the inner consisting of four lobes. There 

 are many parallel close set teeth in the upper jaw, six large 

 teeth in the middle of the under one, and many small ones in 

 its sides. 1 can observe no rays in the membranes of the gill- 

 covers. 



The lateral line may be traced running straight in the middle 

 of the side. 



The first dorsal fin slopes gradually down from before, and 

 its first ray is double the length of the membrane, while the 

 others scarcely exceed it. The last ray of the second dorsal fin 

 is divided to the root. Each pectoral fin contains thirteen rays. 

 The ventral fin is in no way concave below ; but consists of two 

 blunt lobes, the innermost ray of each being divided to the root 

 into four. The last ray of the anal fin is divided to the root 

 into two. The tail fin contains thirteen rays, some of which on 

 each side are short. 



7th Species. — Gobius tredecemradiatus. 

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

 berance ; with thirteen rays in the first, and fourteen in the 

 second back fin ; and with twelve in that behind the vent. 



