9. Sturiones, with the branchiæ in the usual form.
Of the bony fishes the Acanthopterygii, or fishes with hard spiny fins, are divided into fifteen families, the principal of which are the perch family, the mailed cheek fishes, including the gurnards, the flying fish of the Mediterranean, and the sticklebacks, or jack banticles; the mackerel family, including the tunny, bonito, and sword-fish; the pilot-fish, the dolphin of the Mediterranean, so celebrated for the beauty of its dying tints, and the John Dory. Among the Malacopterygii abdominales, or soft-finned fishes, that have their ventral fins suspended from the abdomen, the most interesting are the carp family, the pike family, the flying-fish of the ocean, the salmon family, and the herring family, including the sprat, pilchard, and anchovy.
The Malacopterygii sub-brachiati are soft-finned fishes, with the ventral fins beneath the pectorals; the principal of which are the cod family, including the haddock, whiting, and ling; the flat-fish family, including soles, turbots, plaice, and flounders; and the suckers or lump-fish.
The Malacopterygii apodes are confined to the eel family.
The Lophobranchii include the pipe fish, and other fishes of similar form.
The Plectognathi comprise the very singular forms of the balloon-fish, the sun-fish, and other similar fishes.
The Chondropterygii, or Cartilaginous fishes, are divided into three orders, viz. the Sturiones, or sturgeon family; the Selachi, or sharks and rays, including the torpedo; and the Cyclostomi, or lamprey family. The last two orders were included by Cuvier in a single one.
THE MOLLUSCOUS ANIMALS
Have no bones except their shells. Their sense of feeling appears to be very acute, but the organs for the other senses are either wanting or very imperfect. The blood is cold and white, and the heart often consists of only one ventricle; a few of them have imperfect lungs, but the greater number breathe through gills. They have all the power of remaining a long time in a state of rest, and their movements are either slow or violently laborious. Some of them appear incapable of locomotion. They produce their young from eggs, but some lay their eggs on a part of their own body, where the young are hatched. The following are Cuvier’s six classes:—