1919.] B- ^- Chaudhuri . Fish from Burma. 281 



The fish is broad and deep with a round belly and thick head. 

 The dorsal profile is highly convex : from the anterior root of the 

 dorsal fin it suddenly slopes towards the snout, which is broad, 

 blunt and moderately round and thick ; the posterior portion of 

 the dorsal profile runs in a more gentle curve to the caudal 

 peduncle where, about the middle of the peduncle, it is slightly con- 

 cave. Beyond this the curvature is again convex to the upper 

 corner of the root of the caudal fin. The ventral profile, with its 

 lowest point at the root of the pelvic fin, nearly corresponds to 

 the curvature of the dorsal profile but with less abruptness in the 

 frontal portion from the root of the pelvic fin towards the lower 

 jaw. The curvature from this point is still less convex than the 

 dorsal profile, towards the caudal peduncle. 



The mouth is terminal and inferior, and its opening is wide ; 

 the upper jaw is thick and deep with a movable upper lip ; the 

 lower jaw is extremely thin wdth a horny or cartilaginous plate 

 with a Httle prominence in the middle. On the broad and obtuse 

 snout there is a row of open pores four in number, two on each 

 side. The maxillary extends nearl^^ to below the front of the eye 

 and there are two maxillary barbels. On each side below the 

 preorbital there is a narrow slit. The eye is nearly in the middle 

 of the head and the diameter of the orbit is contained nearly three 

 times in the length of the head. The latter is contained three 

 and two-third times in the total length without the caudal fin. 

 The length of the barbel is equal to that of the snout, which is 

 slightly less than the length of the orbit. The gill openings are 

 almost restricted to the sides and the gill membranes are conflu- 

 ent with the skin of the isthmus ; the surface underneath the 

 lower jaw and below the neck from the chin to the isthmus 

 appears to be in part corrugated; immediately below the lower 

 jaw it is somewhat fleshy and spongy probably with adhesive 

 function. 



The height (the greatest depth at the anterior root of the 

 dorsal fin) is. contained two and four-fifth times in the total length 

 without the caudal fin and the least depth of the caudal peduncle 

 is contained nearly seven times in that length. 



The anterior end of the dorsal fin, though nearly equidistant 

 from the tip of the snout and the root of the caudal fin, is slightly 

 nearer to the snout. There are thirteen scales in front of the 

 dorsal fin and ten between the last ray at its posterior end and the 

 root of the caudal fin. There are three spines, all entire, and 

 twenty-five branched and divided rays. The length of the longest 

 dorsal ray is contained about four times in the total length. 

 The distance between the tip of the snout and the superior root of 

 the pectoral fin is contained three and a half times and the length 

 of the fin about four times; there are altogether fifteen rays in 

 the fin which almost reaches the root of that of the pelvic. 



The tip of the snout and the root of the caudal fin are nearly 

 equidistant from the root of the pelvic fin which has nine rays ; 

 the length of the rays is contained five times in the total length 



