Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . ishes named teleostia? From two Greek words signifying perfect, and bones, in reference to the perfect bony skeletons which they possess. 1045. In fishes of this orderthe skull is always of a verycomplicated structure, composedof numerous bones; the gills aresupported upon free bony arches,and the water passes away fromthem by a single aperture, pro-
Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . ishes named teleostia? From two Greek words signifying perfect, and bones, in reference to the perfect bony skeletons which they possess. 1045. In fishes of this orderthe skull is always of a verycomplicated structure, composedof numerous bones; the gills aresupported upon free bony arches,and the water passes away fromthem by a single aperture, pro-tected by bony gill covers. Themouth is always formed by apair of jaws, and usually armedwith teeth. The ORDER is again divided into six Sub-orders: ; 2. Anacanthina; 3. Pharyngognatha; ; 5. Lopobranchia; 6. Plectognatha. Sub-order I.—Physotomata. 1046. Why is the sub-order physotomata so named?From the Greek phuaso, to blow, or inflate, in allusion to the possession of an air-bladder, connected with thepharynx by a duct, which only occurs in these fishes, of allthe teleostia. 1047. The fishes belonging to this group are usually furnished witha complete series of fins, which are always composed entirely of soft. * Yarrells History of British Fishes. 326 KNOWLEDGE OF NATURAL HISTORY. Genius, piercing as the electric flame,When waked in one, in others wakes the same.—Scott. rays, with the exception of the first ray in the dorsal, anal, and pectoralfins, which are sometimes spinous. The ventral fins are sometimes want-ing; when present, they are always abdominal in position. The skin issometimes naked, at other times more or less covered with bony plates;in most cases, however, it is thickly clad with scales. The air bladderis connected with the pharynx by a sort of duct. The sub-order includesmost of the important fishes that are sought for as food by man, andone species which possesses electrical powers. 1048. Why has the gymnotus the power of comm
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