2^6 Records of the Indian Museum, [Vol. VIII, 



the head is contained three times in the distance between the 

 end of the snout and the apex of the heart. The gill openings form 

 two oblique slits on the ventral side as far behind the cleft of 

 the mouth as the end of the snout is in front of it. The teeth are 

 uniserial, directed backwards and pointed. The dorsal and caudal 

 fins are slightly developed, confined to the posterior one-third of 

 the tail and continuous with each other. There are no pectorals. 



Colour. — Muddy grey, the ventral side being slightly lighter. 



Upper Rotung, alt. 2000 ft. Five adult specimens from the 

 streams reserved for drinking purposes, found buried in the mud, 

 total lengths from 220 mm. to 182 mm. One young specimen, 

 found in a small branch of a shallow stream in Upper Rotung, 

 under a stone, is only 62 mm. in total length. The occurrence 

 of such a young specimen in a shallow hill stream is extremely 

 interesting. 



Sub-order PERCESOCES. 



Fam. OPHIOCEPHALIDAE. 



Ophiocephalus gachua, Ham. Buch. 



Yembung, iioo ft. ; Balek and Dibrugarh. 



Fam. SCOMBRESOCIDAE. 



Bclonc cancila (H.B.). 



Dibrugarh. 



Black patches are wanting. The longitudinal band does not 

 extend quite up to the e^^e. 



Sub-order ACANTHOPTERYGII. 



Division — Perciformes. 

 Fam. SERRANIDAE. 

 Ambassis ranga (H. B,). 

 Dibrugarh. 



Fam. NANDIDAE. 

 Badis badis (H. B.). 



Kobo, 400 ft.; also from a stream below Balek. 



The Balek specimen has two distinct round black blotches 

 on the dorsal fin — one at the commencement and the other at 

 the end, but the specimens from Kobo have only one black blotch 

 near the posterior base of the dorsal fin. 



Nandus nandus (H. B.) 



Dibrugarh. 



