REPORT ON FISHES. PART I : COBITIDAE 313 



posterior jaw is left bare. The posterior jaw is sharp and shovcl-lil^e and the anterior 

 jaw lies as a Imod in front of it. The harlx-ls are thin and long; tlie inner rostrais are as 

 long as the diameter of tlie eye while the other two pairs are mnch longer. 



Some of the specimens are heavily parasitised l)y worms, so that the depth of the body 

 is liable to considerable variation. The depth of the body is contained from 8.5-9.9 times 

 in the total length and from 7-7.6 times in the length without the caudal. Behind the gill- 

 opening and above the base of the pectoral fin, the lateral line is represented by a thin-walled, 

 broad tube beyond which it is faintly marked, thriugh it is continued to the base of the 

 caudal fm. The caudal peduncle is long and narrow; its least height is contained from 

 4.8-6.4 times in its length. In the male specimens the least height is either erjual to or 

 greater than the diameter of the eye while in the females it is considerably less. 



The dorsal fin is inserted slightly in advance of the ventrals and its commencement 

 is considerably nearer to the tip of the snout than to the base of the caudal; it is longer than 

 the head ; its posterior edge is truncate or slightly crenulate. The paired fins are horizontally 

 placed ; the pectoral fin is broad but pointed in the middle ; it is somewhat shorter than the 

 head and separated from the ventral by a distance equal to half of its length. The ventrals 

 e.xtend beyond the anal opening and in some cases even beyond the commencement of the 

 anal fin which e.xtends about half the way to the base of the caudal. The caudal fin is 

 longer than the head; its posterior border is concave with the upper rays considerably longer 

 than the lower. 



Nemachilus deTerrai exhibits sexual dimorphism. The secondary sexual characters 

 of the male are similar to those described above for N. stoliczkac. The difference in the height 

 of caudal peduncle is also well marked in the two sexes. 



Air-bladder: The air-bladder is divided into two parts, (i) the anterior part consisting 

 of two round, lateral chambers enclosed in b(jny capsules and connected by a short, trans- 

 verse tube, and (ii) a large posterior part lying free in the abdonn'nal cavity and connected 

 with the trans\erse tube bv a short tul)e. By another short, liut broader, tube it is connected 

 with the oesophagus. The posterior part is slightly constricted in the middle so that it con- 

 sists of two chambers. In a specimen about 110 mm. in total length, the measurements of 

 the bladder are as follows : 



Total length of bladder 25.00 mm. 



Length of posterior part 20.00 mm. 



Width of anterior part 7.50 mm. 



Width of ])osterior part 7.50 mm. 



Transverse diameter of each anterior chamber .... 3.25 mm. 



Length of tube between two anterior chamljcrs .... 1.00 mm 



Length of tul)e between anterior and posterior ])arts 1.70 mm. 

 The ai)()ve measurements are of the bladder after its removal from the bony capsules. 



The bony cajisules of tlu' air-liladder lie just I)eneath the skin and are distinctly visible 

 from the external surface. 



In spirit specimens the general colour of the body is pale-olivaceous. There is usually 

 a lilack, fairly broad streak along the lateral line which is composed of a series of 

 darker blotches. In some the dorsal surface is gray so that there is a lighter stripe 

 between the dorsal band and the lateral line. The dorsal and the caudal lins are provided 



