NO. 8 UPPER EOCENE ARTIODACTYLA — GAZIN 73 



prises scarcely more than one of the several plications noted on the 

 posterointernal wall of this tooth. In referred specimens of P. peter- 

 soni in the Princeton collection, from in or near the White River 

 pocket, P^ is clearly two rooted. One of these, P.U. No. 11222, is the 

 excellent skull and jaws figured by Scott (1899, pi. 2, fig. 5). The 

 teeth in this specimen are not fully exposed, as the jaws have not been 

 separated from the skull, but enough can be seen of the upper molars 

 on the left side to indicate that the protocone is noticeably bilobate pos- 

 teriorly only on M^. Moreover, the parastyle and mesostyle are sur- 

 prisingly prominent and so deflected on M- and M^ as to form con- 

 spicuous pockets with the paracone and metacone, respectively. Evi- 

 dence of such a prominent stylar development is seen also on the rather 

 well worn molars of P.U. No. 14647. The latter specimen likewise has 

 a two-rooted P^ but may have more strongly crenulated enamel as indi- 

 cated by the highly serrate cingulum lingual to the metaconulid of IVP. 

 These two specimens may represent a species or possibly a genus 

 distinct from Protylopus petersoni, but too little is known of the dental 

 characters of this species, and I suspect that the above Princeton speci- 

 mens are no more than variants. The outline of the molars in occlusal 

 view resembles Protylopus more closely than Oromeryx. 



PROTYLOPUS? ANNECTENS38 Peterson, 1919 

 Plates 13 and 14 



Type. — Portions of the skull, lower jaws, and other parts of the 

 skeleton, CM. No. 2932. 



Horizon and locality. — Uinta C, Myton pocket, Uinta Basin, Utah. 



Discussion. — The type of Protylopus? annectens was not available 

 for examination at Carnegie Museum, as it has been temporarily 

 removed from the collections, or possibly lost. It is, however, repre- 

 sented by a magnificent array of nearly 200 skulls, maxillae, and 

 jaws in the National Museum collection from a single quarry in 

 Myton pocket. From Peterson's description, measurements, and in- 

 formation as to horizon and general locality, there appears to be no 

 doubt as to the species represented by these specimens, but the generic 

 reference is questioned as it is not certain as to whether this species 

 should be referred to Protylopus or to Oromeryx. So long as Pro- 

 tylopus is regarded as distinct, it may be preferable to retain the 

 species in that genus, as the outline of the upper molars more nearly 

 corresponds to P. petersoni. However, the bifurcate character of the 

 posterior crest of the protocone, so well developed in the Myton pocket 



38 Also illustrated in Peterson, 1919, fig. 15 ; pi. 37, fig. 14. 



