,108 
MEMOII^S OF THE QVEEESLANB MVSEVU. 
How acquired: — Collected by Dr. J. K. Tosh, and presented by him to 
the Queensland Museum. 
Dimensious: — According to Bleeker this species attains a length of 500 
millim. (On y voit quelquefois des iiidividus d’un demi -metre de long.) 
. . V 
HOL ACANTHUS IMPERATOR (Bloch). 
Japanisclie-Keizer Ruysch, Coll. Nov. Pise. Amboina, 1718, p. 37, pi. ix, fig, 1. 
Douwing-cammus Renard, Poiss. Molucpies, i, 1718, pi. xvi, fig. 93. 
Einpereiir du Japon id., ibid., ii, 1719, pi. Ivi, fig. 238; Valentyii, Amboina, iii, 1724, p. 462, 
fig. 370. 
Ikan-djamhan Valentyn, ibid., p. 362, fig. 51. 
Poisso7i-couronn4 id., il)id., p. 479, fig. 418. 
Chcetodon iDipcrator Bloch, Ausl. Fisch., iii, 1785, p. 51, pi. cxciv ; Bonnaterre, Encycl. Meth,, 
Ichth., 1788, p. 92, pi. xciii, fig. 384 ; Gmeliii, Linnseus Syst. Nat., ed. 13, i, 1789, p. 1255 ; 
Schneider, Bloch Syst. Ichth., 1801, p. 217. 
Holacanthn-s imperator Lacepedc, Hist. Nat. Poiss., iv, 1802, pp. 527, 534, pi. xii, fig. 3 ; Cuvier 
& A^alcncienut's, Hist. Nat. Poiss., vii, 1831, p. 180; Blcokcr. Nat. Tijds. Nedcrl Ind., 
iii, 3 852, p. 758; id., Act. Soc. Sci. Iiido-Neerl., i, IMaiuido and ^lacassar, }), 48 ; id., ibid., 
vhi, Celeb(*s, etc., p. 35 ; Gunther, Brit. Mu.s. Catal. Fish., ii, 1860, p. 52 ; Bleeker, Ncderl. 
Tijds. Dierk., ii, 1865, p. 287 ; Kliinzijiger, Verh. zool.-ljot. Ges. Wien, xx, 1870, p. 787 ; 
Bleeker, Nederl. Tijds. Diork., iv, 1873, p. 140 ; Gfinthcr, Fisch. d. SuUsee, i, pt. 2, 1874, 
p. 53, pi, xli, fig. A ; Bleeker, Pollen & Van Dam, Hist. Madagascar, pt, 4, 1875, p. 96 ; 
Day, Fish. India, i, 1875, p. 112, pi. xxviii, fig. 5 ; Seale, Occ. Pap. Bishop IMus., i, 
No. 3, 1901, ]). 104 ; Jordan & Seale, Bull. U. S. Bur. Fish., xxv. 1905, p. 349. 
jicanthochmtodoH ■wipemior Bleekei', Verh. Akad. Amsterdam, xvii, 1877, Chaet., p. 150 ; id.. 
Arch. Neerl. Sci. Nat., xii, 1877, p. 21 ; id., ibid., xiii, 1878, p. 41 ; id., Verh. Akad. Am- 
sterdam, xviii, 1879, iMauiice, p. 14. 
Type localit y : — Moluccas. 
Depth of body 1-75 in its length; dorsal and ventral contours about 
-e(iually elevated but uot symmetrical, the former unduious and moderately 
acclivous to the ua])e, wiiich is eonvex; beyond this it rises very gently to about 
the 6th dorsal spine, wheiu'c it descends in a long curve to the caudal peduncle; 
ventral contour ii'rcgularly convex between the chin and tlu‘ vent, thence curving 
upwards more strongly to the peduiude, the least depth of which is S*25 in the 
length of the body. Widtii of head 1*5 in its lejigth, which is 1-1 in its depth 
and 3-5 in the body-length. Diameter of eye 2-15 in the length of the snout, 
which is half that of the heatl ; iiiterorbital region convex, its Avidth 1*5 time 
the eye-diameter. -Mn.xillary uot extending to the vertical from the Jiostrils. 
l*reorbital entire, its width one third more than the eye-diametei*. Hinder limb 
of preopercle inclined well backAvards, evenly serrated, the lower limb with or 
without one or more strong teeth, the spine sliort and very strong (sometimes 
double). 3-b in the length of the luaul, and not reaching to below the middle of 
the opercle. 
Seales small and ctenoid, the exjmsed area more or less completely spinu- 
lose; the basal margin not or hut little lobulate. Lateral line complete but 
inconspicuous. 
