210 



Records of the Indian Museum. 



[Vol.. XIX, 



difference, undoubtedly show a progressive degeneration as regards 

 this organ. 



A scale from the base of the dorsal fin is cycloid in outline 

 with an irregular flat base and an arched apex. The nucleus is 

 situated close to the base, about 9 radii going out from it to the 

 apex. The immber of circular striae is indefinite ; there may be as 

 many as tvventy. Near the base they come ver}' close to one 

 another and are difficult to count. 



Since the above description was written^ I have found four 

 well-preserved specimens (collected by Dr. Annandale, F ~^) 

 in the unnamed collection of the Indian Museum. i\ll of these 

 are young, the longest being 25 mm. in total length. 



The chest and the belly are flat, naked and highly muscular. 

 The upper lip is thick and muscular but not fringed, the lower lip 



Kt. 4. — Scale from base of dorsal 

 fin of Psilorhyncluis 

 balitora. 



Fifi. 5. — Scale from base of 

 dorsal fin of Psilorhyn- 

 cluis tditacitlntus. 



and the area just behind it are tuberculated. At the angles of 

 the mouth there are fleshy appendages. 



The air-bladder is not covered by a tliick fibrous coat and is 

 quite normal except that the posterior chamber is much reduced 

 and the anterior one slightly expanded. 



Localities : — Both the old specimens are from the Khasi Hills, 

 Assam. Those collected by Dr. Annandale are from the Maha- 

 nanda River at vSiliguri (alt. 200 ft.), just below the Darjiling 

 Himala3^as. 



PsiIorhynchus(? tentaculatus, Annandale.' 



1919. Psilorliyiiclnis tentacTilatiis, Annandale, Rec. IiuL Mits. X\'I, 

 p. 128. 



The air-bladder in this species is quite of the normal Cyprinid 

 type, the posterior chamber being larger than the anterior one. 



1 In a paper to be published shortly I give reasons for placing this species 

 in a separate genus. 



