. Cope papers, 1871-[1897. Zoology; Paleontology. 771^ Extinct American Rhinoceroses and their Allies. [December, state of things commences in the extinct species of Kansas, the Aphclops Fig. 3.—Aphelops fossiger Cope, skull from below, one-sixth natural size. Loup Fork beds of Kansas. In the bones of the skeleton, modifications accompanying those of the cranium and dentition may be observed. The femur of the species of the earlier formations may be readily distinguished from that of those of the later Tertiaries by the forms of both the extremities. In the Aceratheria this bone res
. Cope papers, 1871-[1897. Zoology; Paleontology. 771^ Extinct American Rhinoceroses and their Allies. [December, state of things commences in the extinct species of Kansas, the Aphclops Fig. 3.—Aphelops fossiger Cope, skull from below, one-sixth natural size. Loup Fork beds of Kansas. In the bones of the skeleton, modifications accompanying those of the cranium and dentition may be observed. The femur of the species of the earlier formations may be readily distinguished from that of those of the later Tertiaries by the forms of both the extremities. In the Aceratheria this bone resembles that of the tapirs in the form of the great trochanter. This process is produced at its external border, has a recurved apex, and encloses a deep trochanteric fossa. In Aphelops it is precisely as in Rhi- nocerus, obliquely truncate externally, without prominent apex or well _ marked fossa. In the Aceratheria the inner crest of the rotular groove is but moderately prominent; in Aphclops and Rhinocerus it is greatly developed. The succession of development of the line of the Rhinoceridce is now not difficult to trace, and I give the following diagram in explanation of it. Ccelodonta / Rhinocerus. Atelodiis. \ / Ceratorhimis. Aphelops. Zalabis. Aceratherium. Diccrathcriiim. \ I / It is evident that the descent diverged at a comparatively late period of geological time into two lines, which are represented at the present day by the African and Indian soecies resnectivelv. 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 Cope, E. D. (Edward Drinker), 1840-1897. Philadelphia, etc.
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