. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. Series 2. CHONDEOPTERYGII. 317. Fj(;. lis.—Balistcs pcographicus. Alulcres, have the body loii?, the {granulations scarcely visible, and a sin2;lc spine in the first dorsal, but the pelvis is completely hidden iii the skin. Triacanthus, has a kind of vcntrals, each sup- ported by one lar^c spinous ray, adhcriui- to a non- projectin;^' pelvis; the tirst dorsal has one Iarg;ish spine, an<l three smaller ones behind it; the body is crowded with smal
. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. Series 2. CHONDEOPTERYGII. 317. Fj(;. lis.—Balistcs pcographicus. Alulcres, have the body loii?, the {granulations scarcely visible, and a sin2;lc spine in the first dorsal, but the pelvis is completely hidden iii the skin. Triacanthus, has a kind of vcntrals, each sup- ported by one lar^c spinous ray, adhcriui- to a non- projectin;^' pelvis; the tirst dorsal has one Iarg;ish spine, an<l three smaller ones behind it; the body is crowded with small scales; and the tail is long;cr than in any of the other snbs'enera. The single known species inhabits the Indian Ocean. Ostracion, the Trunk-tish, has the head and body covered in such a manner with plates of bones, soldered together, as to form an inflexible cuirass, leaving only the tail, the fins, the mouth, and a small margin of the gill-opening, capable of mo- tion,—all of which moveable parts pass through openings of the cuirass. The greater part of the vertebra; are also soldered together. The jaws are furnished with a row of ten or twelve conical teeth ; and they have no apparent gill-opening, except a mere slit with a cutaneous lobe ; but inside the skin they have a gilWid and six rays. They have neither pelvic bone nor ventrals, and the single dorsal and anal are both small: they have little flesh, but the liver is large, and abounds in oil; the stomach is also very large and membranous. Some of thcra are thought to be poisonous. They might be subdivided according to the form of the body and the spines, but it is not yet ascertained whether there may not be sexual difl'erences in these respects. [The body is triangular in tome, quadrangular in others, and in some it is compressed; and the appearance of the cuirass, or covering, varies still more. None has been mat with on the British shores.] CHONDROPTERYGII. The second series of Fishes, the Ciiondroptekygii, o
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