. Lehrbuch der Zoologie. Zoologie. Glas 3. Amphibia. Bestellung 1. Urodela. 405 Metamorphose {Amhlystoma mexicanum) ist ähnlich wie ein Salamander. Der Axolotl, wliicli ist in Mexiko, ist oviparous; beim ersten geschlüpft, es ist wie bei der Triton Larve des gleichen Stadium. 4. Unter dem Namen, Perennibranchiata, gesammelt sind alle Urodela oben beschrieben (s. 403), da die Kiemen und andere larvalen Merkmale Thi'oughont Leben. Unter diesen ist der Blinde, blasse, längliche Proteus anguineus, die rudimentäre Augen, und drei Ziffern auf jedem Fuß; in unterirdischen Seen in Österreich. Außerdem

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. Text book of zoology. Zoology. Glass 3. Amphibia. Order 1. Urodela. 405 metamorphosis {Amhlystoma mexicanum) is similar to a Salamander. The Axolotl, wliicli is indigenous to Mexico, is oviparous; when first hatched, it is just like the triton larva of the same stage. 4. Under the name, Perennibranchiata, are collected all the Urodela described above (p. 403) as retaining gills and other larval characteristics thi'oughont life. Amongst these is the blind, pale, elongate Proteus anguineus, which has rudimentary eyes, and three digits on each foot; in subterranean lakes in Austria. Furthermore, the genus, Menohranchus, less elongate, with four digits on each foot, and Siren lacertina, which may attain a length of 1 m., 'with homy jaws; vermiform, without hind limbs ; both in W. America. The genera, Menopoma and AmpMuma (the latter vermiform; with four very small limbs, each with two or thi-ee digits), lose their gills as ah-eady mentioned, but retain the gill- slits and several other laiTal characters. Nearly allied to Menopoma, is the Japanese Giant Salamander {Cryptobranchus japonicus), in which the branchial clefts are closed. Related to the living Urodela are the StegOCephala (primitive Amphibia), a large gi'oup, which lived in the Carboniferous, Permian, and Triassic periods, and of which a few were remarkable for their great size ; skulls are known of I'S m. long. The skull has a larger nuniber of membrane bones than in existing Amphibia; there is, for example, a double supraoccipital and several others.* The skull bones are often scarred externally, and this signifies that they were located close below the sm-face, covered only by a thin skin; sometimes there are furrows on the head, for the branches of the lateral line, t recalling those A B â C o '^ If. ^<F=?SHV WjcV. 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 perfect

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• bookcentury1800
• bookdecade1890
• booksubjectzoology
• bookyear1896