BY W. MACLEAY, F.L.S. 75 



dorsal spines eleven or twelve ; anal, three. The upper lip is 

 thin, sword-shaped and can be nearly entirely hidden beneath 

 the prceorbital. Both jaws anteriorly with four canine teeth ; 

 the lateral teeth united into an osseous ridge ; a posterior canine 

 tooth. Six branchiostegals. 



Indian Ocean and Archipelago. 



688. XyruocniLUS fasciatus, Gunth. 



Proc. Zool. Soc, London, 1867, p. 101, pi. 10. 



D. 12/8. A. 3/10. L. lat. 29. L. transv. 4/10. 



The height of the body is one-third of the total length ; the 

 length of tho head nearly one-fourth. Head rather longer than 

 high, compressed, the width of the interorbital space (which is 

 flat) being equal to the diameter of the eye. Eye immediately 

 below the upper profile, in the middle of the length of the head. 

 Anterior and posterior canine teeth greenish-blue. Scales on the 

 cheek in six series. Opercular membrane of moderate extent. 

 Pectoral fin without a notch behind, nearly as long as the head, 

 extending to the vent. Caudal fin truncate. The head and 

 upper part of the body seems to have been reddish-orange, the 

 hinder and lower parts greenish. Head and body with bluish- 

 ashy cross-bands edged with violet : two narrow in front of the 

 eyes, one broad, between the eyes, one from the eye to the mouth 

 and round the chin, one from the nape to the throat and five on 

 the body. Dorsal fin orange with the base and tips violet ; anal 

 and ventral similar; pectoral and caudal orange-coloured. 

 Length eight inches. 



Cape York. 



Genus Trochocopus, Gunth. 



Body oblong, covered with rather small scales ; head scaly, as 

 long as, or longer, than high, with the snout of moderate extent ; 

 both limbs of the prseoperculurn naked and without serrature. 



