1898.] SCOTT — OX THE SELEXODOXT ARTIODACTYLS. 79 



Oromeryx Marsh, Anier. Journ. Sci., third series, Vol. xlviii, 

 p. 269. 



No representative of this genus has yet been detected in the 

 Princeton collection ; it may be distinguished from the preceding 

 genera by two principal characters. According to Marsh, '* there 

 is no diastema in the dentition," and in the second place, his 

 figure shows that the upper molars, especially m ^, have a subovate 

 crown, due to the much greater transverse breadth in the anterior 

 than in the posterior half. 



Protoreodon Scott and Osborn. 



Agriochcerus MdiXsh. (non l^Qidy'), Anier. /cum. Sci., third series, 



Vol. ix, p. 250. 

 Eomeryx Marsh, ibid., Vol. xiv, p. 364 {/io7fien nudiun). 

 Protoreodon Scott and Osborn, Proc. Amer. Phil. Soc, 1887, 



P- 257. 



Eomeryx Marsh, Amer. Journ. Sci., third series. Vol. xlviii, p. 

 266. 



The collection contains a large number of specimens appertain- 

 ing to this genus, and adds very materially to our knowledge of it, 

 but as the newly acquired individuals only confirm the conclusion 

 previously reached, that this genus is ancestral to the Oreodontidce. 

 of the Oligocene and Miocene, description of the new material will 

 be reserved for the extended paper. 



Agriotherium gen. nov. 



Premaxillaries reduced and upper incisors small ; upper canine 

 large, recurved and trihedral ; premolars simple and thick trans- 

 versely; py caniniform ; p ^ implanted by three fangs, but has no 

 deuterocone ; deuterocone of p ^ conical, not crescentic ; molars 

 like those of Protoreodon, but with outer crescents of superior 

 molars more concave, and more prominent median buttress, into 

 wdiich median valley extends. Cranium relatively longer and face 

 shorter than in Protoreodon and postorbital processes of frontals 

 shorter. 



This genus is evidently very close to Protoreodon, but may be 

 distinguished from it by the reduced premaxillaries, the smaller 

 incisors, the simpler premolars and the more concave outer lobes of 

 the upper molars, as well as by the longer cranium, shorter face, 

 and less prominent postorbital processes. 



