BRACHYAMBLYOPUS 329 



pressed to subcircular, obtuse, the breadth and depth about equal, 

 with convex dorsal profile, the tip of snout low, the lower jaw 

 very heavy, prominent, without barbels, the mouth oblique. The 

 eyes very small to minute, immersed, more or less visible, never 

 conspicuous. The low dorsals and anal united with the elongate 

 pointed caudal, but not covered with thick, tough skin, the rays 

 visible. The body may be covered with small, half-immersed, 

 sparsely scattered scales, larger posteriorly, or it may be smooth 

 and naked, except for minute scales near base of caudal. Dorsal 

 VI, 1-28 to 32 ; anal I, 27 to 33 ; the pectorals very short, rounded, 

 the ventrals small. The gill openings narrow, vertical, the isth- 

 mus wide; branchiostegals 5, according to Bleeker. 

 Species few, in the East Indies. 



165. BRACHYAMIJLYOPUS OLIVACEUS up. nov. 



PLATE 25, FIG. 3 



Dorsal VI, 1-30 to 32; anal I, 29 to 32. 



The body elongate, laterally compressed, the depth 7.3 to 8.3 

 times in length, the tail longer than head and trunk together ; 

 the large blunt head has a convex profile, downward-curved 

 anteriorly and almost depressed, 5 to 5.5 times in the length, 

 its depth and breadth approximately equal, 0.6 to f its length; 

 the low broad snout 3.6 to 4 times in head; the minute eyes 

 distinctly visible, laterodorsal, the convex interorbital 0.6 to 0.8 

 of snout, 5 to 6 times in head; the lower jaw very large, heavy, 

 and strongly projecting, the large oblique mouth at an approx- 

 imate angle of 45, the lips comparatively thin, without fleshy 

 flaps at the corners ; from ten to sixteen enlarged, erect, pointed 

 teeth at outer edge of upper jaw, their 'tips inward-curved; 

 behind them is a single row of small, slender, pointed teeth; in 

 lower jaw is an outer row of ten to fourteen enlarged, long, 

 curved, pointed, depressible teeth, inclined inward ; behind them 

 is a row of similar teeth, from half to less than half their size; 

 no barbels, papillae, pores, or ridges on head; the skin smooth, 

 naked, with small, circular cycloid scales barely visible to the 

 naked eye at base of caudal, and extending forward about one- 

 third the distance to anus ; the dorsals and anal continuous with 

 caudal, not densely enveloped in skin; the caudal narrow, very 

 elongate, pointed, easily broken, 3.6 to 4.5 times in length, much 

 longer than head ; the pectoral very broad, rounded, 2.15 to 2.75 

 times in head; the small, narrow ventrals 1.6 to 2.2 times in 

 head, 8.7 to 10.2 times in length. 



