502 PHYSOSTOMI. 



Habitat. — Rivers below Darjeeling. I was given some specimens up to 3^ inches long, by Dr. 

 Stoliczka, who obtained them from that locality. 



3. Exostoma Berdmorei. 



Blyth, P. A. S. of B. 18G0, p. 155 ; Giinther, Catal. v, p. 205 ; Day, Proc. Zool. Soc. 18G9, p. 52C. 



D. i I 0, P. tV, V. 6, A. 6, C. 14. 



Maxillary barbels reach the base of the pectoral fin. The snout is much more pointed than in the other 

 species. J'/zis— caudal rather deeply forked. Colours — " dingy olive-brown, with obscure dark broad bands, 

 presenting more or less of a clouded appearance : the fins mostly darker, below pale." 



Habitat. — Tenasserim. The typical specimen (4 inches long) in the Calcutta Museum, is in such a very bad 

 state of preservation that I cannot add more to Blyth's description. 



4. Exostoma StoliczksB, Plate CXVII, tig. 3. 



Day, Proceedings Zoological Society, 187G, p. 782. 



D. i I 0, P. 1/12, V. 6, A. 6, C. 15. 



Length of head from 4 in the young* to 5| in the adult, of caudal 8, height of body 7^ in the total 

 length. Eyes — minute, situated in the middle of the length of the head : the width of the interorbital space 

 eqimls half the length of the snout, or the distance between the eye and the front nostril. Head depressed, as 

 broad as long, and obtusely rounded. ]\Iouth inferior : lips thick, and studded with small tubercular elevations : 

 the upper and lower lips continuous at the angle of the mouth, but the transverse fold across the lower jaw is 

 interrupted in the middle. Nostrils close together, the anterior round and patent, the posterior tubular ; a 

 barbel di\'ides the two nostrils, it is situated on a bridge of skin, below which the two nostrils are continuous. 

 Barbels — the nasal ones reach the hind edge of the eye : the maxillary ones have a broad basal attachment, and 

 reach the root of the pectoral. Of the mandibular barbels the anterior are situated just behind the inner end 

 of the lower labial fold : they are shorter than the outer pair, which latter extend to the gill-opening. Gill- 

 opening situated on the side of the head in front and above the base of the pectoral fin. Teeth — several rows 

 of pointed ones in each jaw, of which the outer is slightly the larger, rather wide apart, and with rather obtuse 

 summits. Fins — the dorsal arises midway between the snout and the commencement of the adipose tin ; its 

 greatest height is one-third more than the length of its base : its spine is rudimentary and enveloped in skin. 

 Adipose dorsal very long and low, posteriorly in some instances it is free, in others it almost appears to decrease 

 in height and join the free portion of the tail. Pectoral nearly as long as the head, having its outer half 

 horizontal and its inner vertical : its spine is rudimentary, with a broad, striated, cutaneous covering. Ventral 

 of a similar form to the pectoral ; its first and a portion of its second ray also with a striated cutaneous 

 covei-ino- : the fin commences on a vertical line falling just behind the base of the dorsal fin : it is rather nearer 

 the snout than the posterior end of the adipose dorsal, and commences midway between the bases of the 

 ventral and caudal fins : it is half higher than long. Caudal cut almost square. Free poi-tion of the tail one-half 

 higher than long. SJdn — tuberculated from the head along the lower surface of the body to nearly as far as 

 the bases of the ventrals. Colours — of a dull yellowish gTeen, becoming lightest along the abdomen. Fins 

 yellowish, with dark edges or bands. 



Habitat. — Lek or Ladak, and along the head waters of the Indus, attaining about 7 inches in length. 



* The remarkable difference in the comparative length of the head to that of the total is shown in the following figures :— 



3 specimens 4 inches in length. Head 4 to 4i in the total length. 



4 „ 4-2 to 4-5 „ ,, ^ to 5i „ 



5 „ 5-0 to 5-7 „ „ 5 to 54 „ 

 3 „ 6-0 to 6-6 „ „ 5J to 5J „ 

 2 „ 7 „ „ 54 to 5 J „ 



