27 



and In the manner in which the lips cover and move with the jaws. 

 It differs tVoiu Odax in the teeth and ventral fins. 



Oplegnathus, genus novum. 



Corpus ellipticum, crassum, squamis parvis oblongis tectum. Man- 

 dihulcB modo Scarorum dentes incorporates gerentes. Labium 

 supevius basi profundi sulcatum, intermaxillas fer^ tegens, et cum 

 illis movens. Operculum osseum alt^ sinuatum, hinc bilobatum, 

 cum geni squamis parvis tectum. Dorsum monopterygium. Costae 

 branchiostegse quinque. Pinna ventrales ponfe pectorales sitae, 

 radiis quinque ramosis et uno aculeato sustentatse. Radii aculeati 

 pinnarum dorsi anique fortes. Fasciae squamosae inter radios ar- 

 ticulatos pinnarum verticalium decurrentes. 



Op. Conwaii, species unica cognita. 



Radii.— Br. 5-5; P. 18 ; V. 1 | 5 ; D. 12 ] 12 ; A. 3 [ 12 ; 

 C. 15|. 



In Mr. Lempriere's collection there are three epecimens of Ostra- 

 Kion which the author considers as examples of the Auritus of Shaw, 

 of different ages, and one which he characterizes as a new species, 

 also belonging to Mr. Gray's sub-genus Aracana. They are known 

 at Port Arthur by the name of " Pig-fish." 



OsTEACioN spiLOGASTEK. Ostr. {Arucuna) , Ventre muculato ; la- 

 ieribus dorsoque fasciis interruptis ornatis, quarum quatuor sub 

 oculo numerandis, tribus in basibus piimarum dorsi anique at 

 tribus prope finem pinna cauda anastomosantibus. 



Radii.— F. 1 1 ; D. 11 ; A. 11 ; C. 11. 



The three following species are also from Van Diemen's Land, 

 though not now characterized for the first time. 



OsTRACioN AURITUS (Sha,w). Ostr. (Aracana), ventre pallenti 

 unicolore ; laleribus dorsoque lineis saturatis rectis curvisque 

 ornatis, quarum quinque sub oculo numerandis, et tribus in propi'iis 

 basibus pinnarum dorsi, ani, caudaque. 



Radii.— F. 11 ; D. 11 ; A. 11 ; C. 11. 



OsTRACioN FLAviGASTER (Gray). Ostr. (Aracana), ventre pallida 

 unicolore, laferibus dorsoque lineis saturatis per cur sis, quarum octo 

 sub oculo numerandis, totidemque lineis pallidis interjacentibus ; 

 in basi pinme caud<e lineis quinque pallidis et tribus in basibus 

 pinnarum dorsi caudceque. 



OsTRACiON ORNATUS (Gray). Ostr. (Aracana), lateribus dorso- 

 que albo tessellatis ; facie ventreque lineis purpureis, fuscis, et 

 albidis numerosis, percursis ;ftisciis sex obscuris in pinnd caudcs, 

 sub finem anastomosantibus. 



MoNACANTHUS RUDis. (Nob.) Grct/ Monucanthus. Mon. (nee pa- 

 leari e.ctensivo, nee caudd setosd, nee corpore papilloso vel pern- 

 celligero preedilus }) retro-scaber ; colore (murino ?) immaculato ; 



