. The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture . sing it at the pleasure of the bones of tliis kind arc abundant in some strata,and are known by the name of Ichthyodorulites. Whenthe air-bladder is present, it is furnished with a pneu-matic tube ; hence those who consider the Siluroids tobe merely a fami
. The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture . sing it at the pleasure of the bones of tliis kind arc abundant in some strata,and are known by the name of Ichthyodorulites. Whenthe air-bladder is present, it is furnished with a pneu-matic tube ; hence those who consider the Siluroids tobe merely a family group, place it among tlie Physos-tomi of Mtiller. Family I.—GLANIDIANS (Siluridm).Plate 4, figs. 22, 23. To avoid using the same designation for the familythat Agassiz has applied to the order, we have bor-rowed an epithet from Aristotle. The Glanidians area very large family, and resemble the Malacoptcresand also the Ganoids, in havitig a pneumatic tube tothe air-bladder. Their skins are either naked, oiencased in the expanded plates of the lateral line; themouth is bordered above by the premaxillaries, themaxillaries being reduced to mere vestiges, or elongatedinto soft, flexible barbels: all iiave barbels either atthe nostrils, or on the borders of the mouth. Theswim-bladder is connected to the acoustic organs by. Tangsa (Clarias pulicaris> chains of ossicles ; tlie cavity of the cranium is closedlaterally, as in the Cyprinoids; and the posterior bones(if the skull are generally prolonged to furnish sutureswith the first vertebral spines. The stomach has asac-like protuberance below the pylorus; and thebranchiosiegals vary in number from nine to eighteen. Tlic are—Sihivus; Giants (Agassiz); Schildcs; Ce-/■psis; Bajrus; Cephalocassis (Bleeker); Gargnta (id.) ; Hara( Blyth) ; Platystojna ; Galelchihys ; Pangasins ; SilundUi ;SfeWes (ftliill. nnd Trosch.) ; Ariodes (id.); Eutropivs (\di.^ \ftsteogeneiosus (Bleckcr); Arius; Asterophysiis(yincr)yJ!ittrachocij
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