100 MEMOIRS OF THE QUEENSLAND MUSEUM. 



Holacanthiis tibicen Cuvier & Valenciennes. Celebes to Lord Howe Island. 1 

 „ navarchus Cuvier & Valenciennes. Moluccas to New Guinea 



(Macleay). 

 „ diacanthus Boddaert. India to Tahiti. 



„ nit obariensis Schneider. India to Tahiti. 



Ch/ETodontoplus dubouleyi Giinther. 



conspicillatus Waite. 



Key to the Genera. 

 a 1 . Exposed portion of scale smoothly and horizontally striated, without or with a spinulose 

 border, the basal margin lobulate ; gill-membranes narrowly attached to isthmus 



HOLACANTHUS . 



a- . Exposed portion of scale everywhere densely spinulose ; the basal margin without lobules ; 

 gill-membranes more broadly attached to isthmus . . . . . . Chjetodontoplus. 



HOLACANTHUS Lacepede. 



Holacanthiis Lacepede, Hist. Nat. Poiss., iv, 1802, p. 525 (tricolor) ; Giinther, Brit. Mus. Catal. 



Fish., ii, 1860, p. 42; Bleeker, Atlas Ichth., ix, 1877, p. 58; Jordan & Evermann, Fish. 



North and Mid. Araer., pt. 2, 1898, p. 1682. 

 Genicanthus Swainson, Classif. Fish., ii, 1839, p. 212 (lamarchii). 

 Centropyge Kaup, Arch. f. Nat., xxvi, 1860, p. 138 (tibicen). 

 Acanthochcetodon Bleeker, Arch. Neerl. Sci. Nat., xi, pt. 2, 1876, p. 308 (lepidolepis) ; id., Atlas 



Ichth., ix, 1877, p. 67. 

 Angelichthys Jordan & Evermann, Check-list North Amer. Fish., 1896, p. 420 (ciliaris); idd., 



Fish. North and Mid. Amer., pt. 2, 1898, p. 1684. 



Body ovate or elevated, strongly compressed. Scales moderate or small, 

 adherent, ciliated, the exposed portion covered with smooth horizontal striae, 

 which may be coarse and regular (as in bicolor) or fine and irregular (as in 

 sexfasciatus), with or without a narrow spinulose border, and with the basal 

 margin more or less conspicuously lobulate. Lateral line complete or incomplete, 

 the tube simple or branched. Head short and deep, with declivous profile,, 

 pointed snout, and wide preorbital, wholly scaly. Mouth terminal and protrac- 

 tile, with narrow transverse cleft, the jaws equal or the lower the longer; 

 dilated portion of maxillary more or less fully exposed, scaly. Nostrils supero- 

 lateral, approximate, the posterior open and circular, the anterior valvular and 

 much nearer to the eye than to the tip of the snout. Eyes small, median or 

 anteromedian, high, the interorbital region moderately wide and usually elevated. 

 Preorbital denticulated or smooth at least in the adult; preopercle usually 

 serrated. One dorsal fin with xii to xvi 15 to 23 rays; procumbent spine present 

 or absent; spines strong, pungent, usually graduated; soft portion of fin more 



1 In the Records of the Australian Museum, vol. iii, p. 203, Waite announces the occurrence 

 of this species at Lord Howe Island, and claims it as " an addition to the Australian fauna." 

 This is, however, incorrect, he having somehow overlooked my record of ten years previously 

 published in the Proceedings of the Linnean Society of New South Wales, vol. xiv, p. 1028. The 

 same remarks apply to Brama raii and Gristiceps australis and in a lesser degree to Chironemus 

 marmorafua and Trachinotius botla (russellii), while Pegasus draconis, also there recorded, is omitted 

 wholly from his list. 



