APPENDIX 



Aet. LIV. — Description of Miocene Mammalia ; by 

 O. C. Marsh. (With Plates YII-X.) 



The object of the present article is to figure and to describe 

 more fully a number of interesting remains of mammals 

 which have already been named and briefly noticed by the 

 writer. These specimens are mainly from the Rocky Mountain 

 region, but a few were found on the Atlantic coast, in New 

 Jersey, and, owing in part to this fact, it becomes possible for 

 the first time to establish approximately in the Miocene a horizon 

 common to the two regions. 



Protoceras celer, Marsh.* 



The type specimen of this genus and species is represented,, 

 one-half natural size, in the two figures on the accompanying 

 plate, number VII. Figure 1 represents the skull seen from 

 above, and showing on the parietal bones (p) the diminutive 

 horn-cores (h) that suggested the generic name. The suture 

 (s) between the parietals and frontals (f) is very distinct in 

 the specimen, and is clearly shown in the figure. The median 

 elevation on the posterior part of the frontals is also well 

 marked. The depression (a) in the maxillary is likewise a 

 noticeable feature in this view of the skull. 



In figure 2 of Plate VII, the same skull is represented as 

 seen from below. This view shows the dentition to be rumi- 

 nant in type, with the premolars all unlike the molars. The 

 posterior nares (ri) are noteworthy for their forward position. 



The most interesting points in this type specimen were given 

 by the writer in the original description above cited. The 

 new genus Protoceras was shown to represent a distinct family, 

 which was named the Protoceratidm. Some characters seen 

 in the type specimen suggested affinities with the Giraffes, and 

 this fact was stated in the description. 



In the following year, 1892, Dr. J. L. Wortman discovered 

 several specimens of Protoceras in the same region where the 

 type was found, and later Prof. H. F. Osborn and Dr. 

 Wortman published an important paper on the genus, with 

 figures, based upon this material. f These specimens proved 

 that the type was the skull of a female, and that the male 

 skull had, in addition to protuberances on the parietals, a pair 



*This Journal, vol. xli, p. 81, January, 1891. 

 fBull. Amer. Mus., vol. iv, p. 351, 1892. 



Am. Jour. Sci.— Third Series, Vol. XLYI, No. 276.— Nov., 1893. 

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