ICHTHYOLOGY. 15 



midway between the front edge of the eye and the base of the caudal fin ; its upper edge is 

 straight and oblique ; its height rather exceeds that of the body below it, and is one-fourth 

 more than the extent of its base. Pectoral as long as the head excluding the snout, and 

 reaching two-thirds of the distance to the ventral. Ventral commences below the first dorsal 

 ray, is shorter than the pectoral, and reaches two-thirds of the distance to the anal. Anal 

 twice as high as wide at its base. Caudal emarginate, its outer rays being a little produced. 

 Eree portion of the tail at its commencement nearly equals its length in the adult, but is 

 less in the young. Scales absent. Air-vessel in two portions, enclosed in bone. Colours : 

 greyish, having in some specimens numerous fine blackish or dark spots on the body. In 

 some there is a silvery lateral band. 



Hab. Yarkand, Pasrobat, Yangihissar, and Kashghar, all from waters in connection 

 with the Yarkand and Yangihissar or Great Easterly River. 



20. NEMACHEILUS TENTJIS. Plate V, fig. 4. 



Day, Proc. Zool. Soc., 1876, page 796. 

 B. iii, D. , P. 13, V. 8, A. f , C. 17. 



Length of head 5^ to 6^, of caudal 7-J, height of body 9 to 10 in the total length. 

 Eyes : diameter 5| in the length of head, 2 diameters from the end of snout, and 1 apart- 

 Snout rather compressed and overhanging the mouth ; the greatest width of the head equals 

 its height or its length excluding the snout. In some specimens the lower edge of the 

 preorbital is free. Lips thickened and fimbriated in the adult ; lower labial fold interrupted in 

 the middle, and rather lobed on either side. Barbels six ; the outer rostral pair extend to be- 

 low the hind edge of the eye, the maxillary ones to the opercle in the adult. Fins : dorsal 

 commences midway between the end of the snout and the base of the caudal fin ; its upper 

 edge is slightly concave, with a rounded upper angle ; it is rather more than one-half higher 

 than the extent of its base or than the body below it. Pectoral nearly as long as the head, 

 and reaches rather above half-way to the ventral, which latter commences under the third 

 dorsal ray ; is as long as the pectoral, and reaches the base of the anal. Anal twice as high 

 as wide at its base. Caudal slightly emarginate. Eree portion of the tail one-third as high 

 at its base as it is long, while its breadth equals its height. Scales absent. Air-vessel in 

 two portions, enclosed in bone. Colours : yellowish white, the surface and sides sometimes 

 with dark blotches and spots : dorsal and caudal fins with dull spots. 



Tins fish is allied to N. ladacensis, Giinther, but is distinguished by a more elongated 

 body and longer barbels, &c. 



Hab. Aktash (12,600 feet elevation), whence the waters pass to the Oxus ; and Yangi- 

 hiss&r (4,320 feet elevation), where the rivers go to the Yarkand River. 



21. NEMACHEILUS LADACENSIS. Plate IV, fig. 4. 



NemacJieiiiis ladacensis, Giinther, Cat. vii, p. 356. 



B. iii., D. |, P. 13, V. 9, A. -|, C. 19. 



Length of head 5, of caudal 5f ; height of body 5^ in the total length. Eyes : diameter 

 5 to 5J in the length of head, 2J diameters from end of snout, and 2 apart. Greatest width 



