182 MR. C. TATE REGAN ON THE [ Feb. 17, 
TRIACANTHUS STRIGILIFER. 
Triacanthus strigilifer Cantor, Mal. Fish. p. 363, pl. ix. (1847); 
Bleeker, Atlas Ichth. v. p. 89, pl. cexxix. fig. 3 (1865); Giinther, 
Cat. vill. p. 211 (1870). 
Triacanthus longirostris Hollard, Ann. Sci. Nat. (4) 1. 1854, 
p. 46, pl. 11. fig. 3. 
Depth of body about equal to the length of head, about 3 
times in the total length, length of caudal peduncle 43—5 times. 
Snout very slightly concave, its length 13-12 times in that of the 
head, eye-diameter 3-4 times, interorbital width 4-5 times. 
Interorbital space concave, without distinct median ridge. Upper 
edge of occipital crest in the same straight line as that of the 
snout ; distance to base of first dorsal spine from posterior margin 
of eye about 14 times the eye-diameter. D. V, 20-22; A. 15-16; 
the first dorsal spine longer than the head, the second considerably 
more than half as long as the first, the others much shorter; the 
base of the anal fin about half as long as that of the soft dorsal 
fin; pelvis between the ventral spines moderately broad, tapering 
to a point posteriorly. Membrane of spinous dorsal immaculate. 
Total length 185 mm. 
Hab. Seas of Arabia and India; East Indian Archipelago. 
TRIACANTHUS BLCCHI. 
Lriacanthus blochi Bleeker, Nat. Tijds. Ned. Ind. ii, 1852, 
p- 81; Atlas Ichth. v. p. 89, pl. ecxvil. fig. 1 (1865). 
Triacanthus biaculeatus (part.) Giinther, Cat. viii. p. 210 
(1870). 
Depth of body about 3 times in the total length, length of head 
33-3+ times, length of caudal peduncle 43-5} times. Snout 
concave, its length 14-2 times in the length of head, eye-diameter 
3-3? times, interorbital width 4—5 times. Interorbital space 
concave, with median ridge scarcely, if at all, distinct. Upper 
edge of occipital crest forming an angle of about 160° with that 
of the snout; distance from posterior margin of eye to base of 
first corsa! spine about 17 times as long as the eye-diameter. 
D. V,-22-23; A. 16-17; the first dorsal spine longer than the 
head, the others short; length of base of anal fin 17-14 times in 
that of the base of soft dorsal fin. Pelvis between ventral spines 
narrow, tapering to a slender poimt. Membrane of spinous 
dorsal immaculate. 
Total length 150 mm. 
Hab, Kast Indian Archipelago; China. 
TRIACANTHUS BIACULEATUS. 
Balistes biaculeatus Bloch, Ausl. Fische, pl. 148. fig. 2 (1785). 
Triacanthus biaculeatus Cuv. Régne An. 11. p. 152 (1817). 
Triacanthus angustifrons Hollard, Ann. Sci. Nat. (4) 1. 1854, 
p. 40, pl. n. fig. 2. 
