1921.] 



vS. L. HoRA : Fish Iroui tJic F.. Himaljyas. 



7...-> 



:\Ii-. vShaw collected his specimen in the Reang River at an 

 altitude of 2000 ft. in the Darjiling District. 



AborJchthys elongatus, sp. nov. 



This species is represented in Mr. Shaw's collection by three 

 specimens, two of which are young and one adult in a bad state of 

 preservation. It can, however, be readily distinguished from the 

 only other known species of the genus, Aborichthys hempi, Chau- 

 dhuri,' in the points tabulated below : — 



A. eloiigntiis. sp. nov. 



The snout is almost equal to the post- 

 orbital part of the head. 



There are onlv six branched rays in 

 the dorsal fin. 



The dorsal is equidistant from the tip 

 of the snout and the base of the caudal 

 fin in the adi:!t specimen ; in younger 

 specimens it is somewhat nearer to the 

 lip of the snout than to the base of the 

 caudal. 



Besides these points the proportions and the colouration are 

 totally dififerent in the two species. 



.-I. keml>i, C'haudhuri. 



The snout is a little shortei' than 

 the po5t-orbit:il part of the head. 



There are 7 branched rays in the 

 dorsa'. fin. 

 . The dorsal is equidistant bctwern 

 the tubular nostrils and the root of 

 the caudal.' 



[..iterai view of Aboriclitliys elongnltif, sp. nov. Slightly enlarged. 



A. elongatus is greath' elongated and compressed from side 

 to side. Both the dorsal and the ventral proiiles are straight and 

 horizontal behind the pectoral fins and run almost parallel to each 

 other to the base of the caudal fin. The head is rounded and 

 cylindrical ; its length is contained G'l times, the depth of the 

 bodj' 86 times and the length of the caudal fin 65 times in the total 

 length including that of the caudal fin. The eyes are situated on 

 the dorsal side in the middle of the head and are not visible from 

 below ; their diameter is contained 7'6 times in the length of the 

 head and J2 times in that of the snout. The mouth is situated 

 on the under surface a short distance behind the tip of the snout 

 and is bordered with thick lips ; the lower lip is interrupted in 

 the middle. The lips are not fringed. The nostrils are close 

 together and are situated nearer to the eye than to the tip of the 

 snout ; the membranous fold between the two is produced into a 

 barbel-like outgrowth on either side. The dorsal fin commences 



I Chaudhuri, Rec. Ind. Muf. \TII, p. 245, pi. vii, figs. 1, \a, 'b (19131. 



