1903. ] FISHES OF THE GENUS TRIACANTHUS, 183 
Triacanthus macrurus Bleeker, Atlas Ichth. v. p. 91, pl. cexxii. 
fig. 3 (1865). 
Triacanthus biaculeatus (part.) Giinther, Cat. viii. p. 210 (1870). 
Depth of body about 24 times in the total length, length of 
head about 33 times, length of caudal peduncle 44-5 times. 
Snout concave, its length 12-14 times in the length of head, eye- 
diameter 33-4 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 12-14 times as long as the eye-diameter. 
D. V, 23-24; A. 18-19; the first dorsal spine longer than the 
head, the others short ; length of base of anal fin 12-14 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, Kast Indian Archipelago; Australia; China. 
TRIACANTHUS OXYCEPHALUS. 
Triacanthus oxycephalus Bleeker, Verh. Bat. Gen. xxiv. 1852, 
p. 27, pl. v. fig. 10; Atlas Ichth. v. p. 90, pl. ecxx. fig. 3 (1865). 
Triacanthus biaculeatus (part.) Giinther, Cat. viii. p. 210 (1870). 
Depth of body 24-23 times in total length, length of head 
about 3 times, length of caudal peduncle 64—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. Inter- 
orbital space flat. Upper edge of occipital crest convex ; distance 
from posterior margin of orbit to base of first dorsal spine about 
12 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 13—1? 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. Kast Indian Archipelago, 
TRIACANTHUS BREVIROSTRIS. 
Triacanthus brevirostris Schlegel, Faun. Japon., Poiss. p. 294, 
pl. exxix. fig. 2 (1846); Bleeker, Atlas Ichth. p. 94, pl. ccxxxi. 
fig. 3 (1865); Giinther, Cat. vii. p. 209, part. (1870). 
Triacanthus biaculeatus Bleeker, Verh. Bat. Gen. xxii. 1849, p. 6. 
Triacanthus rhodopterus Bleeker, Verh. Bat. Gen. xxiv. 1852, 
p. 25, pl. iv. fig. 8. 
Triacanthus russellii Bleeker, t. c. p. 25. 
Depth of body 24-2? times in the total length, length of head 
34-32 times, length of caudal peduncle 47-54 times. Snout 
straight, its length about twice in that of the head, eye-diameter 
33~5 times, interorbital width about 34 times. Length of post- 
