BY W. MACLEAY, F.L.S. 331 



length. Profile above concave, the mouth opening- upwards, with 

 tlvree triangular very acutely pointed incisors in each jaw, and 

 with the chin round, prominent and extending beyond the mouth. 

 Dorsal spine short, the length less than the diameter of the orbit, 

 irregularly and densely covered with spinelets, and situated over 

 the posterior third of the orbit ; there are two minute rays behind 

 it in the usual membrane. No ventral spine ; caudal fin of very 

 strong rays, of pointed form, the middle ra} r s very long, nearly 

 one-third of the total length. Shin velvety with very minute 

 spines. Colour in spirits brownish-grey, indistinctly marked with 

 spots and bars, most conspicuous on the tail ; in fresh specimens 

 the ornamentation is most elaborate. 

 Port Jackson. Length seven inches. 



Genus Anacanthus, Gray. 



Body compressed, elongate, covered with minute asperities. 

 Dentition as in Mbnaoanthus. The first dorsal fin reduced to a 

 single feeble spine. Ventral fins none. Lower jaw with a fleshy 

 barbel. Vertebra) 20-30. 



East Indian Archipelago, Australia. 



1030. Anacanthus barbattjs, Gray. 



Gunth., Cat. Pishes, VEIL, p. 255.— Bleek., Atl. Iehth. Ealist., 



pi. 5, t. 226. 

 D. 44-51. A. 59-65. 



The height of the body is two-fifths of the length of the head, 

 which is two-fifths of the total length without the caudal fin. 

 Caudal fin very elongate, longer than the head. Dorsal spine 

 very feeble, setiform, above the hind margin of the orbit. 



West Australia. (Macl. Mus.) 



Genus Ostraciox, Artedi. 



The integuments of the body are modified into a carapace 

 composed of juxtaposed hexagonal osseous scutes, the snout, 



