BY W. MACLEAY, F.L.S. 327 



spine long, straight, with a double series of strong spines 

 directed downwards on its posterior part, and very faint traces of 

 a similar double series, as far distant, on the anterior face. 

 Colour dark brown, beneath lighter ; fins light, probably rosy in life. 



Swan River. Length seven and a quarter inches. 



1023. Monacaxthus BRUNNEUS, Casteln. 

 Proc. Zool. Soc, Victoria, Vol. II., p. 108. 



D. 35. A. 27. P. 15. C. 7. 



Body rather elongate, entirely covered with very fine spines 

 which give it a velvety appearance. The height of the body is 

 contained twice and one-third in the total length, the length of 

 the head three times and two-thirds in the same ; the diameter 

 of the eye is one-third of the length of the head. Snout rather 

 concave above ; the space between the dorsal fins is convex. The 

 dorsal spine is stout, inserted over the first third of the orbit, 

 covered with fine closely set tubercles, and has on its posterior 

 edge two series of short, thick, conical spines, which towards the 

 base extend to the middle of the breadth of the spine ; the second 

 is very visible. Caudal fin rounded ; the anal begins behind the 

 second dorsal, and both fins are highest at one-fourth of their 

 length. The ventral spine is formed of a small knob of spinules, 

 with a few longer ones on the sides, and four still longer ones 

 directed obliquely, two forwards and two backwards. Colour 

 chocolate-brown, with the posterior margin of the caudal fin 

 white, the dorsal and anal fins pink, and the pectorals of a light 

 brown. Length three and a half inches. 



Knob Island (Torres Straits). 

 C. Dorsal spine with irregularly arranged barbs and filaments. 



1024. MONACANTHUS PENICILLIGERUS, CuV. 



Gunth., Cat. Pishes VIII., p. 245.— Bleek. Atl. Ichth. Balist., 



p. 129, pi. 221, fig. 3. 



