Title: Text book of zoology
Identifier: cu31924000397905 (find matches)
Year: 1896 (1890s)
Authors: Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie
Subjects: Zoology
Publisher: London, Sampson Low, Marston
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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430 Vertebrata. â able, some of colossal size, bigger than tbe largest extant teiTestrial Mammals (in one species the tlugh-bone is 2â3 m. long, and very thick); though small forms also occur. The limbs are powerful; in some, fore and hind legs are about equal in length, but generally the former are smaller, sometimes even much feebler than the hind limbs, and many Dinosaurians moved almost entirely upon the latter, possibly springing along; among those with stronger hind limbs some were digitigrade, whilst other Reptiles are plantigrade; the tail is long and powerful. The pelvis is very remarkable; the iUa are much prolonged in front of the acetabulum, agreeing with Birds not with Reptiles, and in those Dinosaurians which have small fore limbs (e.g., Iguanodon, Fig. 355), the pubis also is very peculiar in foi-m: a long thin process (p') arises from its base, and
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Fig. 356. AâB fore and hind limts of one of the Dinosaurians, which are some way from birds (Morosaurus grandis). CâD Do. of a bird-Kke Dinosaur (Gamptonotus dispar). a tarsus, c coraooid, d toes, d' fingers, / femur, g fibula, h humerus, i ilium, Ic ischium, m metatarsus, «i' metacarpus, r radius, s scapula, sk pubis, t tibia, u ulna.â After Marsh. reaches back, in a dii-ection almost exactly opposite to that of the main branch, l3dng close against, and parallel to the ischium, which is often long and thin. There is a larger number of sacral vertebrae than in other Reptiles (four or more) and these are fused. Among other chai-aoters, it may be mentioned, that the proximal series of tarsals is in many cases immovably attached to the tibia (or fused with it); the tibia has a long projecting ridge on its front face. The foi-ms of the femur and tibia are very different from those of other Reptiles and very birdlike. (See also the remarks made below upon avian skeletons.) The Dinosaurians lived in Triassic, Jui-assic, and Cretaceous times. Class 5. Aves (Mrds). The most striking peculiarity of the avian body lies in the structure of the limbs, the hind are exclusively developed for walking, or hopping (sometimes, also, for swimming), whilst the fore

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