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Show 1903.] f ish e s of t i ie genus t r ia c a n th u s . 183 Triacanthus macrurus Bleeker, Atlas Ichth. v. p. 91, pi. ccxxii. fig. 3 (1865). Triacanthus biaculeatus (part.) Gunther, Oat. viii. p. 210 (1870). Depth of body about 2-i times in the total length, length of head about 3| times, length of caudal peduncle 4|-5 times. Snout concave, its length l f - l - f times in the length of head, eye-diameter 3|-4 times, interorbital width 4-5 times. Interorbital space concave, with median ridge scarcely, if at all, distinct. Upper margin of occipital crest forming an angle of about 170° with that of the snout; distance from posterior margin of eye to base of first dorsal spine If-1 -f times as long as the eye-diameter. 1). V, 23-24; A. 18-19; the first dorsal spine longer than the head, the others short; length of base of anal fin 1- f - l f times in that of the base of the soft dorsal fin; pelvis between ventral spines rather narrow, tapering posteriorly to a slender point. Membrane between first and second rays of spinous dorsal fin blackish. Total length 180 mm. Hab. East Indian Archipelago; Australia ; China. T r ia c a n th u s o x y c e p h a l u s . Triacanthus oxycephalus Bleeker, Verh. Bat. Gen. xxiv. 1852, p. 27, pi. v. fig. 10; Atlas Ichth. v. p. 90, pi. ccxx. fig. 3 (1865). Triacanthus biaculeatus (part.) Gunther, Cat. viii. p. 210 (1870). Depth of body 2^--2| times in total length, length of head about 3 times, length of caudal peduncle 6^-7 times. Snout slightly concave, its length about 14- times in the length of head, eye-diameter 3-4 times, interorbital width 3-3^ times. Interorbital space flat. Upper edge of occipital crest convex ; distance from posterior margin of orbit to base of first dorsal spine about 1| times as long as the eye-diameter. D. V, 24-25 ; A. 17-19 ; first dorsal spine longer than the head, the others short; length of base of anal fin l f - l| times in that of the base of the soft dorsal fin ; pelvis between the ventral spines broad anteriorly, tapering to a point posteriorly. Membrane of spinous dorsal fin immaculate. Total length 140 mm. Hab. East Indian Archipelago. T r IACANTHUS BREVIROSTRIS. Triacanthus brevirostris Schlegel, Faun. Japon., Poiss. p. 294, pi. cxxix. fig. 2 (1846); Bleeker, Atlas Ichth. p. 94, pi. ccxxxi. fig. 3 (1865); Gunther, Cat. viii. p. 209, part. (1870). Triacanthus biaculeatus Bleeker, Verh. Bat. Gen. xxii. 1849, p. 6. Triacanthus rhodopterus Bleeker, Verh. Bat. Gen. xxiv. 1852, p. 25, pi. iv. fig. 8. Triacanthus russellii Bleeker, t. c. p. 25. Depth of body 24-2 f times in the total length, length of head 3| -3| times, length of caudal peduncle 4|-5| times. Snout straight, its length about twice in that of the head, eye-diameter 3^-5 times, intei'orbital width about 3\ times. £ Length of post- |