716 



Memoirs of tlie Indian Museum. 



[Vol. V, 



The commencement of the first dorsal fin is almost equidistant from the posterior 

 limit of the orbit and the anterior origin of the second dorsal. The length of the base of 

 the second dorsal is almost equal to the length of the head and it commences immediately 

 behind the membranous base of the first dorsal. The last divided ray is the longest and is 

 as high as the greatest depth of the body. The anal fin originates slightly behind the anterior 

 commencement of the second dorsal and its base is shorter than the length of the head. The 

 last ray of the anal is the longest and is slightly greater than the greatest height of the body. 

 The pectoral fin is short and rounded and is considerably shorter than the length of the head. 

 The pelvic fins are as long as the pectoral and are separated from the anal by a short distance. 

 The caudal fin is contained 2-4 times in the total length without the caudal ; it is bluntly 

 pointed behind. 



The mouth is small, with a somewhat oblique opening ; the 

 maxilla just reaches to below the anterior margin of the orbit. 

 There are several rows of minute teeth in both jaws ; those of the 

 outer row in the upper jaw and two teeth, one on each side, of the 

 lower jaw are enlarged. The latter have the appearance of canines. 

 The tongue is pointed in the middle. 



The scales are comparatively large and firmly set on the body. 

 There are about 25 between the angle of the operculum and the 

 base of the caudal fin. Between the anterior origin of the second 

 dorsal and the anal there are five rows of longitudinal scales. 

 Text-fig. 27.— Tooth-bands The scales are feebly pectinated. The cheeks and the opercula are 



and tongue of Ctenogobius 

 cylindriceps, sp. nov. : x20. naked. 



The colouration is very characteristic. In alcohol the sides are dusky with 7 to 11 



vertical, narrow, yellowish bands. The upper surface of the head 

 is also dusky, but its lower surface and the under surface of the 

 body are yellowish. The anterior dorsal is covered with minute 

 black spots and there is also a deep black marking on the mem- 

 brane between the 4th and the 5th spine. The second dorsal is 

 variegated with black and white and the anal is dusky. The 

 pectoral is almost colourless and the pelvic is dark. The upper rim 

 of the caudal is variegated with black and white, while the remain- 

 ing portion is light grey. There are usually a number of black 

 spots along the lateral line and the last component of the series 

 near the base of the caudal fin is somewhat deeper in colour. 

 There are several rounded black spots on the top and sides of the 

 head. The colour fades in some specimens and the fish assumes 

 a uniform yellow tinge. 



The new species can be readily distinguished by its character- 

 istic colouration, especiallv deep black pelvic fins and by its small 



Test-fig. 28. — Under sur- 

 face of head and body of size. The dentition and the tongue are quite different from those 



Ctenogobius cylindriceps, , , . 



sp. nov. : x5|. °f the preceding species. 



