No.l.] COPE ON MIOCENE FAUNiE OF OREGON. 59 



EucEOTAPHus suPERBus Leicly. 



EUCROTAPHUS OCCIDENTALIS Marsll. 



Merycochcerus jleidyi Bettany. 

 Mertcochoerus temporalis Bettany. 



POEBROTHERIUM STERNBERGII, Sp. nov. 



This Euminant is represented by a considerable part of the skeleton 

 with both mandibular rami supporting the teeth, of one indi\idual. The 

 bones are all in close proximity, and sometimes in undisturbed relation, 

 in a single block of stone. 



The species to which I give the above name presents the characters 

 already ascribed to the genus Foebrotherium by Leidy as regards cranial 

 features, and by myself as regards the rest of the skeleton. The third 

 and fourth metacarpals are not coossified, and the second and fifth are 

 not distinguishable. The preservation of the premaxillary bone in this 

 species enables me to demonstrate the presence of superior incisor teeth, 

 a character the presence of which I have heretofore only inferred. As 

 compared with the P. vilsoni, the species differs in its superior size and 

 greater relative robustness. This is seen in the greater depth of the 

 mandibular ramus, and the greater stoutness of the metapodial and 

 other limb-bones. The last inferior molar tooth presents a character- 

 istic peculiarity. The anterior external cusp is separated by a deep 

 groove which divides the external side of the crown to the base from 

 the succeeding cusp. It results that on trituration, the anterior exter- 

 nal crescent is isolated, and does not communicate by its posterior horn 

 with the succeeding crescent, as in P. vilsoni. The last premolar is more 

 robust than that of the P. vilsoni, the wddth of the half- worn surface 

 being half the length of the tooth and enclosing behind an enamel fossa. 

 In P. vilsoni, this tooth is more compressed, and the fossa is represented 

 by an open groove. The first inferior premolar occupies the middle of 

 the diastema following the canine, instead of standtug near the canine 

 as in P. vilsoni. 



Measurements. 



M. 



Diameter of last molar \ ^^^t^^-posterior 0.020 



I transverse 0. OOi) 



Diameter of penultimate molar.. \ ^^^ro-posterior 0.013 



I transverse 0.009 



Depth of ramus at second molar 0.025 



Length of ramus from third molar to extreme posterior edge 0.061 



Length of metacarinis 0.178 



Transverse xiroximal diameter of the two metacarpi 0.029 



Greatest diameter of the head of the humerus 0.053 



Antero-posterior diameter of the condjde of the femur 0.048 



This species is named in honor of Charles H. Sternberg, the indefati- 

 gable explorer of the fossil deposits of the West. 



BoocHCERUs HUMEROSUS, gen. et sp. nov. 



Generic Characters. — The species on which this genus is founded, is 

 represented by a part of the skeleton, which is unfortunately not accom- 



