56 MEMOIRS OF THE QUEENSLAND MUSEUM. 



T. jarbua Forsk. has the smallest scales, according to my material, Avith the 

 basal margin distinctly scalloped. 



All these keep the generic charcaters indicated for T. jarbua in Mem. Queensl. 

 Mus., vol. ii, p. 56. They are very ordinary acanthopterygian scales, distinguished 

 from those of Pomadasis by the closer basal radii. 



SPARID^. 



Lateral circuli transverse or somewhat oblique . . . . . . . . . . . . 1. 



Lateral circuli vertical, or if obliqvie, more nearly vertical than transverse . . . . 2. 



1. Upper lateral circuli broken into interrupted lines, irregvilar and often hooked at end ; radii five 



or six, none reaching lateral niargins . . . . . . . , Pentajjus aurifdmn Ogilby 



(Off Cape Moreton). 



Lateral circuli entire, normal, but there is an area between the uppermost circvili and the 

 ctenoid area which is entirely free from sculpture . . Dentex sparijormis Ogilby 



(Off Cape Moreton). 



2. Basal radii six to nine, none reaching lateral margins ; region aljove level of nucleus with some 



small perforations ; ctenoid structures as in P. aurifilum, but sxibmarginal elements shorter 



Pcntapus setosus C. & V. 

 (Moreton Bay). 



Some of the radii reaching lateral margins (not always in Sparus australis) . . . . 3. 



3. Lateral circuli oblique, forming an angle of perhaps 30 degrees with margin; ctenoid elements 



weak . . . . . . . . . . . . . . . . Sparus australis Gthr. 



(Moreton Bay). 



Lateral circxili vertical, parallel (or almost parallel) ^^ith margin . . . . . . . . 4. 



4. Scales ciuadrate, about as broad as long ; ctenoid patch large ; svibmarginal ctenoid elements 



elongate . . . . . . . . . . . . . . . . Lethrinus glyphodon Gthr. 



(Moreton Bay). 



Scales broader than long (some are square in G gmnocranins) . . . . . . . . 5. 



5. Sul>marginal ctenoid elements elongated . . . . . . Lethrinus ncbulosus Forsk. 



(Moreton Bay). 

 Submarginal ctenoid elements short ; scales larger . . Gyymnocraiiius hitorquatus Ogilby 



(Moreton Bay)'. 



The characteristic ctenoid elements of Lethrinus {L. liarak) were described in 

 Mem. Queensl. Mus., vol. ii, p. 56. The additional species agree. 



The two species of Pentapus in the above key seem to be subgenerically distinct. 

 The European Dentex vulgaris has the lateral circuh oblique, practically as in Sparus 

 australis ; it is very different from D. spariformis, Mhich is perhaps not congeneric. 

 Sparus sarba has the upper lateral circuli quite transverse, but the lower ones are 

 obHque. 



CH.^TODONTID^. 



Holacanthus nox Bleeker. Barrier Reef. Scales small, the ctenoid area Avith 

 strong continuous ridges, ending in teeth. In Mem. Queensl. Mus., vol. iii, p. 44, 

 it is stated (whether by a shp of the pen or a misprint I do not know) that H. bicolor 

 has small separate elements in the basal part of the ctenoid area. The statements 

 there made (section 4) refer not to H. bicolor but to H. sexstriatus. The next section 

 (5) i^roperly refers to H. bicolor. H. nox, at least in some scales, has verj^ distinct 

 basal radii, with the basal margin strongly scalloped. 



Holacanthus imperator has complete rods in the ctenoid area, as in bicolor 

 and nox. 



