SECOND YARKAND MISSION. 
nostril. Head depressed, as broad as long, and obtusely rounded. Mouth inferior ; lip s 
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 divides 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 maxil- 
lary ones have a broad basal attachment, and reach the root of the pectoral. Of the mandi- 
bular 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. GUI-open^!) 
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 fin ; its greatest height is one-third more than 
the length of its base ; its spine is rudimentary and enveloped in slcin. Adipose dorsal very 
long and low. 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. "V entra 
of a similar form to the pectoral : its first and a portion of its second ray also with a striate 
cutaneous covering ; the fin commences on a vertical line falling just behind the base of t w 
dorsal fin ; it is rather nearer the snout than the posterior end of the adipose dorsal, an 
commences midway between the bases of the ventral and caudal fins ; it is half higher than 
long. Caudal cut almost square. Eree portion of the tail half higher than long- ^ 
tuberculated from the head, along the lower surface of the body, to nearly as far as the a 
of the ventrals. Colours ; of a dull yellowish green, becoming lightest along the abdomen 
Eins yellowish, with dark edges or bands. 
IIab. Basgo, Snima, and Leh on the Upper Indus. The longest specimen 7 inches i 
length. . of 
I propose here to shortly remark upon the distinction between the six species 
Exostoma at present known — 
A. — Teeth in jaws pointed, 
1. Fxostoma labiatum. — Lower labial fold uninterrupted. The interspace between 
first and adipose dorsal fins equals two-thirds the length of the latter. Anal commences mn 
nearer the base of the caudal than the base of the ventral. Mishmi Mountains, East Assain 
2. E. blythii. — Lower labial fold interrupted. Interspace between dorsal fins 
slight. Anal commences in last third of distance between ventral and base of cau 
Head-waters or affluents of Ganges. 
3. E, berdmorei, — Snout more pointed. Caudal forked. Tenasserim. 
4. E. davidi 1 . — The interspace between the first and adipose dorsal fins equals 
length of the latter, Pectoral reaches the ventral. Eastern Tibet. 0 f 
5. E. stoliezkee, — Lower labial fold interrupted. Anal commences nearer the 
the ventral than that of the caudal. Pectoral does not extend to the ventral. Upp el 
of Indus. 
B. Outer row of teeth flattened. 
6. E, andersonii. — Low r er labial fold interrupted. Bhamo, Burmah. 
paters 
1 Ch'marrichthys davidi, Sauvage. 
