. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. FISHES food shows that they eat such small animal life as sand fleas and various other small crustaceans, which they gen- erally find among plants. Most of the flying fishes, as well as the frog- and goose- fishes, the toadfishes, and many others, have a superior. Fig. 25. Head of pipefish, Sy?ignathus louisianae, showing the long tubelike snout terminated by the small mouth mouth, that is, opening upward, with the lower jaw pro- jecting beyond the upper one. An extreme case of this occurs in the half beaks, in which the
. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. FISHES food shows that they eat such small animal life as sand fleas and various other small crustaceans, which they gen- erally find among plants. Most of the flying fishes, as well as the frog- and goose- fishes, the toadfishes, and many others, have a superior. Fig. 25. Head of pipefish, Sy?ignathus louisianae, showing the long tubelike snout terminated by the small mouth mouth, that is, opening upward, with the lower jaw pro- jecting beyond the upper one. An extreme case of this occurs in the half beaks, in which the lower jaw is frequent- ly longer than the rest of the head. In these fishes only half the beak is developed, a characteristic which earns them their name. They strongly resemble the salt-water gars, which have very long beaks. The inferior mouth, that is, one opening downward below a projecting upper jaw, occurs more frequently than the other type and generally suggests bottom feeding. The sharks, skates, sturgeons, sailfishes, spearfishes, sword- fishes, most catfishes, suckers, and buflalo fishes all have it. But sharks usually are not bottom feeders. No, but they were once, in ancient geological times, as their fossil teeth show. Instead of the lancelike teeth of the present dangerous sharks, these very old ancestors had only crushing teeth, showing that they fed on bottom-living mollusks. Some living sharks still have blunt teeth. The sawfishes {Pristididae) have the upper jaw greatly produced, so much so, in fact, that it is longer than the rest of the head (Fig. 26). On each side a row of large teeth arm this projection, giving it the appearance of a double-edged saw. It is generally supposed that the [54]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hildebrand, Samuel F. (Samuel Frederick), 1883-
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Keywords: ., bookcentury1900, booksubj, booksubjectfishes, booksubjectreptiles
