. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 4 5 Fig. 4. Lateral view of atlas of Promerycochaenis carrikeri No. 1047; -3- nat. size. Fig. 5. Lateral view of axis of Promerycochcerus carrikeri No. 1047; -3 nat. size. separated below, and the posterior superior exit of the arterial canal has disappeared,8 while further forward at the base and on the superior face of the transverse process is usually found a small venal foramen (See Fig. 4). On the internal posterior part of the arch, above the articulation for the axis is a large, round
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 4 5 Fig. 4. Lateral view of atlas of Promerycochaenis carrikeri No. 1047; -3- nat. size. Fig. 5. Lateral view of axis of Promerycochcerus carrikeri No. 1047; -3 nat. size. separated below, and the posterior superior exit of the arterial canal has disappeared,8 while further forward at the base and on the superior face of the transverse process is usually found a small venal foramen (See Fig. 4). On the internal posterior part of the arch, above the articulation for the axis is a large, round opening, which undoubtedly functions as the arterial canal, and is apparently characteristic of this species. The rugose neural spine occupies a considerable area on the top of the arch. The Axis (Fig. 5).—The axis is unusually shortened antero-pos- teriorly when compared with that of Merycoidodon. The neural spine also overhangs more in front, while the articulation for the atlas 8 The presence or absence of this canal is a matter of individual variation in the Oligocene genus. In the mounted skeleton of Merycoidodon cidbertsoni (No. 1391) in the Carnegie Museum this canal is present, as is also true of some specimens which Professor Scott studied (Morphologisches Jahrbuch, Vol. XVL 1890, p. 322), while Dr. Wortman {Bull. Amer. Mus. Nat. Hist., Vol. VH. 1895, p. 149). did not find a true canal in the material at hand, when he wrote his 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 Carnegie Museum; Carnegie Museum of Natural History. [Pittsburgh] : Published by authority of the Board of Trustees of the Carnegie Institute
Size: 1491px × 1675px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
