. L'histoire naturelle de Cambridge. Zoologie. Vu :. 7.-Hum;atlas de l'assurance-chômage (jeunes), montrant de- velopineut. x j. "", Surface articulaire pour l'occiput ; g, gi-oove pour premier nerf rachidien et de l'artère vertébrale ; j'ai une iuferior, arch ; f, processus transversaux. (À partir de la fleur/i/ Osteiilor.) Fig. 8.-face inférieure de l'atlas du chien. X i,. s/j. Foramen pour premier nerf rachidien ; r, vertehrarterial canal. (À partir de la fleur (Meoloi/y.). Fig. 9.-Atlas de kangourou. (Froju Parker et la zoologie, 5120.6) pour immédiatement. L'ensemble de l'os obtient ainsi un anneau-comme la forme, et les principaux processus des autres vertèbres sont mais peu de- velop

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. The Cambridge natural history. Zoology. Vu:. 7.—Hum;ui atlas (young), showing de- velopineut. x j. «», Articular surface for occiput; g, gi-oove for first spinal nerve and vertebral artery ; i a, iuferior arch ; f, transverse process. (From Flower's Osteiilor/i/.) Fig. 8.—Inferior surface of atlas of Dog. X i, . s/i. Foramen for first spinal nerve ; r, vertehrarterial canal. (From Flower's (Meoloi/y.). Fig. 9.—Atlas of Kangaroo. (Froju Parker and Haswell's Zoology, ) to immediately. The whole bone thus gets a ring-like form, and the salient processes of other vertebrae are but little de- veloped, with the exception of the transverse processes, which are wide and wing - like. In many Marsupials, such as the AV(unbat and Kangaroo, the arch of the atlas is open below, there being no centre of ossification. In others, such as Thylaciims, there is a distinct nodule of bone in this situation not con- crescent with the rest of the arch. The second vertebra, which is known as the axis or epi- stropheus, is a compound structure, the anterior " odontoid process, '' which fits into the ring of the atlas, being in reality the detached centrum of that vertebra.^ It is a curious fact about that jirocess that it has independently become spoon-sliaped in two divisions of Ungulates; that it has become so seems to be shown by the fact that in the earlier types of both it has the simple peg-like form, which is the prevailing form. The cervical ^ Its independence from the epistropheus is emphasised in Monotremes and some Marsupials by its late fusion with that vertebra.. 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 work.. Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company

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