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From Boulenger (1909), p. 140:
Depth of body 3 ½ o 5 1/4 times in total length, length of head 4 1/3 to 5 times. Upper profile of head descending in a straight line or feeble curve; snout produced, about as long as postocular part of head, its length 2 (young) to 3 times its least depth; mouth very small, with thick lips; teeth notched or truncate, 5 or 7 in upper jaw, 6 to 10 in lower; eye moderate, its diameter 1 2/3 to 2 times in interorbital width. Dorsal 78-91, originating considerably in advance of base of ventrals, 5 to 6½ times as long as anal. Anal 18-20, originating at nearly equal distance from base of pectoral and from base of caudal. Pectoral obtusely pointed, about 2/3 length of head; ventral about ½ length of head. Caudal densely scaled, with obtusely pointed lobes. Caudal peduncle 2 to 2 ½ times as long as deep, ½ to 3/5 length of head. 103-118 scales in lateral line, 25-30 / 29-36 in transverse series on body, 35-40 in transverse series between dorsal and anal, 20-22 round caudal peduncle. Olive or purplish brown above, white beneath.
Total length 460 millim. Senegal to Congo and Chad Basin.—Types, in Paris Museum, examined.