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DUSKY acanthurus. 



Acanthitrus Nigro-fuscus. A. mgro-fuscus, corpore ovato, cauda 



utrinque aculeata. 

 Dusky Acanthurus, with ovate body, and spine on each side 



the tail. 



Acanthurus nigro-fuscus. Forsk, Arab, p* 64. 



Much allied, according to Forskal, to the A.Sohal, 

 but differs in being entirely of a blackish-brown 

 colour, as well as in having the lobes of the tail 

 much shorter, and a single spine on each side. 



A variety of the above, entirely of a black colour, 

 is mentioned by Forskal, under the title of Gahm, 

 Both are natives of the Red sea. 



ACHILLEAN ACANTHURUS. 



Acanthurus Achilles. A. corpore ovato fusco, posterius macula 



ovata nuda rubra, medio aculeata. 

 Brown, ovate Acanthurus, with a bare ovate red spot on the 



hind-part, aculeated in the middle. 



Length about five or six inches : shape ovate 

 colour brown : scales small : gill-covers unarmed : 

 teeth broad and crenated : on each side the hind- 

 part of the body or base of the tail a large, ovate, 

 bare, red patch or spot, in the middle of which is a 

 strong spine imbedded in a furrow : tail lunated 

 and tipped by three concentric crescents, the firstr 

 of which is white, the next black, and the third 

 ferruginous, edged with ash-colour. An elegant 



