O. T. BETTANY ON THE GENUS MEKYCOCHCERUS. 259 



30. On the Genus Merycochozrus {Family Oreodontidje), with 

 Descriptions of two New Species. By G. T. Bettany, Esq., 

 B.A., B.Sc, Shuttleworth Scholar, Caius College, Cambridge. 

 (Bead February 2, 1876.) 



(Communicated by Prof. Hughes, F.G.S.) 

 [Plates XVII. & XVIIL] 



A valuable series of mammalian remains, chiefly consisting of 

 skulls and portions of skulls, collected by Lord Walsingham in the 

 valley of John Day's river, a tributary of the Columbia, in Upper 

 Oregon, in the winter of 1871-72, was presented by him to the 

 Woodwardian Museum, Cambridge. Most of the specimens were 

 obtained from near the head of a small stream called Bridge Creek ; 

 but a few were from the Great Canon, higher up on John Day's 

 River, nearly opposite Old Camp Watson. Lord Walsingham se- 

 cured indeed a rich prize in the portions of three days which he 

 devoted to a search for these remains. 



The specimens were, fortunately, for the most part brought to 

 England in masses of the original rock, and had therefore the great 

 advantage of Mr. H. Keeping's care and skill in developing them 

 from the matrix. His labours have given us a valuable and, I 

 believe, unique series of specimens, which serve to extend very 

 largely our acquaintance with the two principal genera of the family 

 Oreodontidae. 



A summary of these fossils may here be given : — 

 ■ 1. A large nearly complete skull, with lower jaw attached, the 

 zygomatic arches being, however, almost destroyed {Merycoclicerus 

 Leidyi, n. sp.). 



2. The greater part of a large skull preserving very completely 

 one zygomatic arch with posterior crest {Merycoclicerus temporalis, 

 n. sp.). 



3. Another skull of Merycoclicerus temporalis, showing the part 

 anterior to the bifurcation of the sagittal crest. 



4. Another skull of Merycoclicerus, probably M. Leidyi, wanting 

 the greater part of the face. 



5. A nearly complete skull of Oreodon major. 



6. The greater portions of two skulls of Oreodon Cidbertsoni (the 

 first- described species of the family). 



7. Half of the frontal region of a Meryocochoerus larger than any 

 of the others. 



8. Casts of the brain of a large and of a small species, with deter- 

 minable parts of bone attached. 



9. Many portions of skulls, chiefly parts of upper and lower jaws 

 with teeth, including a number which show the canine and incisor 

 teeth. 



10. Portions of limb-bones and a number of vertebrae. 



