1920.] S. L. HoRA : Indian H o^nalopteridae . 211 



In all probability, therefore, the species is the most primitive of 

 those I assign to Psilorhynchus. 



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

 general appearance with a slighth' irregular flat base. The 

 nucleus is situated close to the base. There are about 15 radii to 

 the apex and 11 to the base. The number of circular striae varies 

 from 9 — 15 proceeding from the base to the apex. 



Localities : — Poona and Satara districts of the Bombay Presi- 

 dency at altitudes of 2000 — 3000 ft. A specimen from Panchmari 

 in the Mahad Hills in the Central Provinces { F. H. Gravely ) is 

 also present in the collection of the Z.S.I. 



Psilorhynchus sp. (juv.). 



A few 5'oung Psilorhynchus were recently captured by myself 

 in a hill stream at Piphima in the Naga Hills. I have not 

 been able to refer these young individuals to either of the two 

 known species, but I do not think myself justified in drawing up 

 the description of a new species from them on account of their 

 immaturit}'. I am including the following notes in this paper to 

 facilitate reference in future. 



D. 3/6. A. 1/5. P. 6/11. V. 2/6. 



The tisli has a graceful form with the head and body moder- 

 atel}- depressed. The ventral profile is almost horizontal, whiJe 

 the dorsal is slightly arched, being highest near the commence- 

 ment of the dorsal fin. The paired fins are greatl}' expanded and 

 possess a number of unbranched rays which are provided with 

 muscles on their ventral aspect. The dorsal commences slightly 

 in advance of the ventral, and the pectorals when adpressed do 

 not reach the ventrals. The mouth, which is situated on the 

 undersurface slightly behind the anterior end of the snout, is 

 provided with thick, almost continuous lips. The lower lip is 

 rather interesting. It can be divided into four pieces, two promi- 

 nent tubercles in the middle and relativeh' broad flaps adjacent to 

 them, one on each side. The lips, the imdersurface of head and its 

 sides are covered with glandular tubercles. Probably the mouth 

 can be converted into a suctorial disc but the muscular structures 

 connected therewith cannot be made out in my specinu.'ns. 



There are no scales, probably on account of the immaturity 

 of the specimens. 



The air-bladder in this little fish is very interesting. While in 

 all essentials it is like that of normal Cyprinid fishes, it shows 

 certain retrogressive modifications. The posterior chamber is 

 small as compared with the anterior one, which is more flattened 

 laterally than in the normal forms. The bladder lies quite free 

 in the abdominal cavity without an}^ thick fibrous sheath and is 

 not otherwise abnormal. 



The fish is pale olivaceous with a large number of irregular 

 black dots scattered all over the body, the upper surface and 



