. The American diceratheres. Rhinoceroses, Fossil; Paleontology. PETERSON: THE AMERICAN DICERATHERES. 443 Fore Limb. Scapula. The scapula is long, narrow, and recurved. It is perhaps some- what narrower than in earlier types (C. tridadylus, Osb.) and nearer the propor- tions found in more recent forms (R. pachygnathus or R. bicornis Wagn.) In general the outlines are very similar to those of these species. The coracoid is prominent, the supra-scapular notch quite deep. The spine, which nearly equally divides the supra- and infra-spinous fossae, terminates in a very heavy and retro- verted proc
. The American diceratheres. Rhinoceroses, Fossil; Paleontology. PETERSON: THE AMERICAN DICERATHERES. 443 Fore Limb. Scapula. The scapula is long, narrow, and recurved. It is perhaps some- what narrower than in earlier types (C. tridadylus, Osb.) and nearer the propor- tions found in more recent forms (R. pachygnathus or R. bicornis Wagn.) In general the outlines are very similar to those of these species. The coracoid is prominent, the supra-scapular notch quite deep. The spine, which nearly equally divides the supra- and infra-spinous fossae, terminates in a very heavy and retro- verted process. There is a third fossa at the coracoid border immediately above the suprascapular notch, which is separated from the supraspinous fossa by a. Fig. 30. Diceratherium cooki Peterson. No. 2473, Coll. Carnegie Museum. External views of scapula. X 4. somewhat prominent vertical ridge. The fossa itself, however, is rather shallow and of relatively small size. (See Fig. 30). There is very little variation in the details of the scapula in fully adult animals, robustness and size excepted. Humerus. The humerus is short and heavy. The tuberosities of the proximal end, though not as heavy in proportion as in some of the recent Rhinoceroses {R. bicornis), are nevertheless, very prominent and the bicipital groove has a tendency to become double, , separated by a broad, but very low ridge, approach- ing the condition in the recent Rhinoceros where the bicipital tubercle is more prominent. Distally the bone has furthermore a great transverse diameter due to. 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 Peterson, O. A. (Olof August), 1865-; Carnegie Museum. Pittsburgh : Published by the authority of the Board of Trustees of the Carnegie Institute
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleontology, bookyea
