112 PROCEEDINGS OP THE ACADEMY OF 



The estimated length of the skull of Oreodon superbus is about fourteen 

 inches. The length of the skull of 0. major is about nine inches and one- 

 third. 



In a fragment of a lower jaw of 0. superbus, imbedded in the matrix, the 

 crown of the canine is an inch in width fore and aft. The three premolars 

 behind occupy a space of two inches and a third. In Mergcochcerus proprius 

 the crown of the lower canine is little more than three-fourths of an inch 

 fore and aft, and the premolars behind occupy a space of less than two 

 inches. 



Of other remains in the Oregon collection there are a few fragments of jaws 

 of Oreodon Culbertsoni, one of which contains a series of the upper last pre- 

 molar and the true molars. There also occur a few small fragments of molar 

 teeth, which are recognizable as pertaining to Agriochcerus antiquus. There is 

 also here an inferior true molar of Leptomeryz Evansi, and likewise there are 

 several mutilated molars of Anchitherhnn Bairdi. These specimens are all 

 marked as having been obtained from the " Big-bottom of the John 

 Day." 



An interesting specimen from Bridge Creek consists of a small fragment of 

 an upper jaw, containing two teeth, apparently of a tapiroid animal, and pro- 

 bably the same as that indicated by a tooth from the Mauvaises Terres, and 

 referred to a species with the name of Lophiodon occidenlalis. The teeth appear 

 to be the hinder two premolars, or perhaps are the last of these and the next 

 true molar. They are much worn, and the second tooth has its back part 

 broken off. They may belong to a different genus from Lophiodon, and they 

 do exhibit slight peculiarity, but their condition renders a positive determina- 

 tion uncertain. The specimen indicates an animal about the size of the living 

 Tapirus terrestris. 



At least two species of Rhinoceros are indicated by remains from Bridge 

 Creek valley. One of these I think to be the Rhinoceros occidentalis, originally 

 founded on remains from the Mauvaises Terres of White River, Dakota. Sev- 

 eral well preserved upper molars, and a fragment of the lower jaw with an 

 entire molar, marked "John Day's," neither differ in constitution, form or size 

 from those of the last named species. 



An isolated upper molar, marked " Alkali Flat," clearly belongs to a differ- 

 ent species from the former, and may perhaps pertain to the species Rhinoceros 

 hesperius, founded on the ramus of a lower jaw from California. From the 

 outer wall of the crown there project into the median valley three folds, and 

 a small fold projects in the vicinity of the latter from the postero-internal 

 lobe. The arrangement of these folds resembles that of a temporary molar 

 from the Niobrara River, of Nebraska (fig. 5, pi. xxiii, Ext. Mam. Fauna of 

 Dakota and Nebraska) referred to Rhinoceros crassus. It is not improbable that 

 the tooth may belong to a peculiar species, but the material thus far brought 

 to our notice is insufficient to determine the question positively. 



Fragments of a canine tooth in the collection indicate apparently a huge 

 species of Elotherium, perhaps the E. superbum. Another mutilated canine 

 apparently belongs to a smaller species, perhaps the E. ingens. 



Two inferior molars apparently indicate a Peccary about the size of the 

 living Dicotyles iorquatus. 



A small fragment of an upper jaw contains a mutilated molar tooth, indi- 

 cating a species of Anchitherium, larger than A. Bairdi, of the Mauvaises 

 Terres of White River. It may perhaps indicate a different though closely 

 allied genus, as the median lobes are proportionately better developed in rela- 

 tion with the inner and outer ones than in the true Anchitherium. The animal 

 would appear to hold a position intermediate to A. Bairdi and Anchippus texa- 

 nus. Awaiting the opportunity of examining additional material, I would 

 propose for the species the name of Anchitherium Condom, in honor of the 

 Rev. Thomas Condon, the discoverer of these and the preceding fossils which 

 have been the subjects of examination. The fore and aft diameter of the tooth 



[Oct. 



