. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. 318 Div. 1. VERTEBRATE ANIMALS.—PISCES. Class 4. THE FIRST ORDER OF CIIONDROPTERYGII,— CHOXDROPTERYGII BRANCHIIS LIBERIS,— (Or, with free gills), have in their gills a single ^^?ide opening, and a gill-lid, like the Bony Fishes, but they have no gill-rays. There are two genera. Accipenser, the Sturgeon.—General form like that of the Shark, but the hody more or less covered with bony plates in longitudinal ro\ys, and the head externally armed with th
. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. 318 Div. 1. VERTEBRATE ANIMALS.—PISCES. Class 4. THE FIRST ORDER OF CIIONDROPTERYGII,— CHOXDROPTERYGII BRANCHIIS LIBERIS,— (Or, with free gills), have in their gills a single ^^?ide opening, and a gill-lid, like the Bony Fishes, but they have no gill-rays. There are two genera. Accipenser, the Sturgeon.—General form like that of the Shark, but the hody more or less covered with bony plates in longitudinal ro\ys, and the head externally armed with the same. Their mouth, placed under the muzzle, is small and toothless; and the palatal bones, soldered to the maxillaries, form the upper jaw, while there are vestiges of the in- termaxillarics in the thick lips. Placed upon a pedicle of three articulations, this mouth is more ])rotractile V\s. Sturgeon. ^|^^jj jj^^j ^f tj,e g,,^,.j^ . the eyes and nostrils arc on the sides of the head, and barbules are suspended from the muzzle; the labyrinth within the cranial bones is perfect, but there is no external ear—the hole behind the temple leading merely to the gills. The dorsal is behind the ventrals, and has the anal directly opposite to it; the caudal surrounds the extremity of the spine, and terminates in the upper lobe of the tail, but an under lobe gives the tail the appearance of being forked. Internally, we find the spiral intestinal valve, and the single pancreas of the Shark family; and there is a very large air-bladder, which communicates with the gullet by a large opening. Sturgeons ascend some rivers in vast numbers, and are the olycct of valuable fisheries. The flesh of most is agreeable, their eggs or roes are made iuto caviar, and thek air-bladders furnibh the finest isinglass. A. sttirio, the Common Sturgeon, occasionally found hi tlie west of Europe and on the British shores, is about six. feet lonjr, lias u ixiiiitod muzzle, five rows of plates w
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1860, booksubjectzoology
