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LAMARCK’S HOLOCANTHUS. 
The Beaked Chaetodon inhabits the Indian and Polynesian seas, and has been taken oft 
the west coast of Australia, where it is usually found in or near the mouths of rivers. Over 
the head and body of this species are drawn five brownish cross-bands edged with darker 
brown and white, and in the middle of the soft dorsal fin there is a rather large circular black 
spot edged with white. 
Several other species of this genus are recognized, one of which, the Long- beaked 
Cieetodon {Qhebno longirostris ), is truly remarkable for the exceeding development of the 
snout, which considerably exceeds half the length of the head. This species is also notable 
for a large triangular patch of jetty-black, which covers the upper surface of the head, the 
neck, and the side of the head as far as the lower edge of the eye. There is also a circular 
spot of the same hue on the anal fin. This species is a native of Amboyna. 
A very remarkable fish adds to the singular shape of all the group the peculiarly 
elongated dorsal spine from which it has received its name of Long-spined Cieetodon, or 
Charioteer. It also well exhibits the scale-covered fins, a structure which is indicative of 
the large family to which it belongs. Both scientific names are of Greek origin, the former 
signif ying a charioteer, the long slender spine representing the whip ; and the latter signifies 
“single-horned,” in allusion to the same peculiarity. 
The fourth dorsal spine of this species is enormously elongated and whip-like ; its use not 
being as yet ascertained or even conjectured with any show of reason. Over each eye is a 
conical projection, not easily distinguished, on account of the deep black hue with which it is 
colored, and a similar protuberance arises on that part of the fish which is by courtesy termed 
the nape of the neck. 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 sinning 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. 
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 prseoperculum is 
armed. These curious fish are found in almost all tropical seas. 
Nearly forty species of this genus are now known, all of which possess some remarkable 
peculiarity in coloring. There is, for example, the Ringed Holocanthus {Holocanthus 
annularis ), where the shoulder is decorated with a blue ring, and the body is marked with 
six or seven arched blue stripes, all radiating from the base of the pectoral fin. The Spotted 
Holocanthus {Holocanthus maculbsus ) has a number of black, semilunar spots on the fore 
part of the body ; the Ciliated Holocanthus {Holocanthus ciliaris ) is marked with an 
azure ring on the nape of the neck, and a number of blue spots and streaks about the head ; 
the Emperor Holocanthus {Holocanthus imperator ) has a number of blue lines upon the 
head, chest, and anal fin, a large black spot on the shoulder, and the body decorated with 
many waved, orange-colored streaks ; and lastly, the Arched Holocanthus {Holocanthus 
arcuatus ), though not so brightly clad, is quite as striking a species as any that has been 
mentioned, simply on account of the single arched stripe that is drawn along the body, from 
the eye to the end of the dorsal fin, taking a slight upward curve like a bent bow. 
It is said of one of the species, Lamarck’s Holocanthus {Holocanthus lamarckii ), that 
the attachment between the sexes is very strongly developed, and that, if one individual be 
captured, its mate will haunt the fatal spot, and even fling itself ashore or into the net, in the 
eagerness of its search. 
