668 Records of the Indian Museum. [\'ol. XXII, 



much nearer the end of the snout than the base of the caudal fin ; 

 it is not so high as the depth of the body below it. The ventrals 

 commence below the middle of the dorsal fin and their origin is 

 equidistant from the base of the caudal fin and the tip of the 

 snout. The pectorals are as long as the head and are sharp in the 

 middle ; they are separated from the ventrals by a distance which 

 is more than half of their own length The third ray of the 

 ventral fin is the longest ; the fin extends beyond the anal opening, 

 which is situated nearer to the origin of the anal than to that of 

 the ventral. The anal fin is short and does not reach the base 

 of the caudal fin. The caudal fin is evenly lobed and deeply 

 emarginate. The lateral line is straight and runs almost in the 

 middle of the body ; there are 39 scales along its length and 8 

 series of longitudinal scales between the bases of the dorsal and 

 anal fins. The scales are absent near the bases of the pectoral 

 fins and are greatly reduced on the chest and in the middle of 

 the abdomen ; large scales are present in the post-pelvic region. 



The air-bladder is greatly reduced and the posterior chamber 

 is narrow and long. In a specimen 98 inm in length, the following 

 are the measurements of the bladder: — 



.-> ,■> 



Length ot anterior clianiber 



,, posterior ., ... ... io"5 



(-■realest diameter of anterior chamber ., ... ,v!S 



,, posterior ,, .. ... 1'3 ., 



The colour on the upper surface and the sides is black, on the 

 under surface whitish. The dorsal and the caudal fins are dusky 

 as is also the dorsal surface of the paired fins. The anal and 

 the under surface of the paired fins are whitish. There is a 

 minute black spot behind the angle of the operculum. 



Type-specimen. — F 9970/1, Zoological Survey oj India (Ind. 

 Mus ). 



Locality. — A single specimen was obtained by mj'self in 

 the Senapati Stream near Kairong, among the Naga Hills, Assam, 

 in February, 1920. 



Measurements in millimetres. 



Total lenylh withimt the caudal 



Length of head 



Depth of body near origin of dorsal . . 



Width of head ' ... 



Diameter of e^'o 



L-englh of snout 



Interorbital width 



Length of caudal peduncle 



Height of caudal peduncle 



Distance of vent from anterior end of snout 



Length of callous portion of disc 



Width , „ 



Longest ray of dorsal fin ... ... ib"" 



, anal ., ... .. ■ I7'" 



Length of pectoral Hti .. ... ... . 2<'0 



,, ,, ventral .. ... ... ... ■■■ i'*'" 



(>S 

 20 

 20 



i6-5 

 ,S*" 

 I 05 



IO"(l 

 2O-0 

 12-5 



62-5 

 i'o 

 7 '5 



