LONO-SPINED CH^ETODON. Henioohus montcerot. 



is a conical projection, not easily distinguished, on account of the deep black hue with 

 which it is coloured, and a similar protuberance arises on that part of the fish which is 

 by courtesy termed the nape of the neck. It may be seen in the figure, about half-way 

 between the snout and the beginning of the dorsal fin. Three very broad black bands 

 are drawn across the body ; their edges are sharply defined, as if a painter had drawn them 

 with black varnish. The foremost band commences at the first dorsal spine, and sweeps 

 over the neck, upper part of the head, snout, and chin, the eye being imbedded, as it were, 

 in the black ground, and shining with great vividness on account of the contrast. The 

 second band passes from the fifth to the seventh dorsal spines to the abdomen, being 

 rather narrow at the top, and widening as it passes downwards below, but not comprising 

 the pectoral fin. The third band starts a little below the central streak, and is drawn 

 rather obliquely over the body, through the hinder portion of the anal fin. A remarkably 

 fine specimen in the British Museum was captured off the Mauritius. 



THE members of the curious genus to which the SEMILUNAR HOLOCANTHUS belongs 

 are remarkable for a very strong, sharp-pointed, thorny spine with which the prseoperculuir. 

 is armed. These curious fish are found in almost all tropical seas. 



