142 FISHES. 



the other internal, the three intermediate ones branching as usual. They 

 have five branchial rays, and a horizontal spine before the dorsal. The 

 styloid bones of their shoulder lengthen out in a curve, so as to unite 

 themselves by their extremities to the first interspinal of the anal*. 

 Numerous species are found in the Indian Ocean f. 



AcANTHUKUS, LcicSp, and ^/.— Harpurus, Forst, 



These fishes, vulgarly called Surgeons, have the teeth trenchant and 

 notched; a strong moveable spine on each side of the tail, that is as sharp 

 as a lancet, and inflicts severe wounds on those who carelessly handle 

 these fishes; hence their vulgar name. They inhabit the hot parts of 

 both oceans J. 



The dorsal of some species is very high§. 



Some have a sort of brush composed of stiff hairs, before the lateral 

 spinel]. 



In others again the teeth are deeply notched, or pectinated on one side^. 

 The 



Prion URUS, Lac6p. 



Only differ from the preceding genus in the armature of the sides of the 

 t;;il, which consists of a series of fixed, horizontal, and trenchant blades**. 



Naseus, Commers. — Monoceros, Bl. Schn. 



Have, like the preceding, the sides of the tail armed with fixed trenchant 

 blades: but the teeth are conical, and the front projects in a kind of horn 

 or knob above the muzzle; but four rays in the branchi«, and three soft 

 ones in the ventrals; the skin resembles leather ff. 



• GeofF. Phil. Anat. I, 471, and pi. ix, f. 108. 



f Tketitis joints, L., Gronov. Zoophyl. pi. VIII, f. 4; — Siganits stellatus, Forsk.; — 

 Amphac. punctatus, Bl. Schn., or Acanihurus meleagris, Shaw; — Buro hrunneus, 

 Commers., Lacep. V, 421; — Siganns rimdatiis, Forsk.; — Amphac. nehulosus, Quoy and 

 Gaj-m. Zool. Voy. Freycin. p. 369; — Csntrogaster j'ascescens, Houttuyn; — Chatodon 

 puttatus, Bl. 196; — Amph. marmoratus, Quoy and (jaym. Voy. Freycin. Zool. pi. 62, 

 f. 1 and 2; — Amph. magniahac, Ih. f. 3; — Centrogaster argentatus, Houtt, and seve- 

 ral others to be described in our Icthyology. 



+ Chatodon chimrgus, HL 20ii; — Theulis hepattis, L.; Seb. Ill, xxxiii, f.3;—Ac. 

 ghiuco pareius, Cuv., Seb. III. xxv, 3, which appears to be the true Chatodon nigricans, 

 L. ; — Chat. Irioslegiis, Brousson., Dec. Icth. No. 4, or Acanthure zehrc, Lacep., which 

 is also his Chat, zebie, III, xxv, 3; — Ac. gutfalus, Bl., Schn.; — Ac. suillus, Cuv., Re- 

 nard, I, pi. xiv, {.S2;—Chat. Uneatus, L.; Seb. Ill, xxv, \;—Chat. Achilles, Brous- 

 sonnet; — Chat, meta, Russ. 82; — Chat, sohal, Forsk., of which Lacep. has very im- 

 properly made a genus under the nmne o{ A pisunis; — Ac. striatus, Cuv.; Paninau, 

 Renard, pi. 1, f. 8 ; — Ac. argente, Quoy and Gaym. Voy. Freycin., p. 63, f. 3; — Chat, 

 nigrofuscus, Forsk.; — Chat, nigricaiis, Bl. 203, which is not that of Linnaeus. 



§ Ac. velifer, Bl. 427. 



II Ac. scopas, Cuv., Renard, I, pi. xi, 101. 



% Ac. ctentdon, Cuv., a new species. 



*• Prionure microlepidote, Lacep. Au. Mus. IV, p. 205; — Acanihurus scalprum, 

 Langsdorf. 



ft Naseus fronticornis, Cuv., Lacep. Ill, vii, 2, Bl., Schn., pi. 42, Hasseq., it. pal. 

 332; — Nas. tandock, Ren. I, iv, 23 ; Valent. 5 18 ; — Chat, unicornis, Forsk., differ from 

 our first species. — Nas. hrevirostris, Cuv., Ren. I, xxiv, 130; — Nas. tiimifrons, Cuv., 

 badly drawn, Ren. J, 178; — Nas. incornis, Cuv., Ren. I, f. 128, and not so well, f. 147, 



