306- MEMOIRS OF THE CARNEGIE MUSEUM 
the porcine remains, which have been found in the Loup Fork Miocene of Nebraska 
by the field parties of the Carnegie Museum, working from time to time in that 
formation since 1901 up to the fall of the present year (1905) ; (2) to carefully com- 
pare the osteological characters of the new material with those already known to 
occur in the different species of the same genus from the. John Day Miocene of 
Oregon ; (8) it is intended, if possible, to more closely correlate and confirm the idea 
of Mr. Hatcher as to the relationship of these two formations.* By careful com- 
parison and deduction it would seem that at least a portion of the Upper John Day 
is represented in the lower horizons of the Miocene sandstones of western Nebraska 
and eastern Wyoming.” 
TurinoHyvs (B.) suBmHQquANS? Cope. (Figs. 1, 2 and 3.) 
See Cope, Proe. Am. Phil. Society, Vol. X VIII., pp. 374-375, 1879; Vol. XXV., pp. 67-70, 1888. 
_ This species is represented in the paleontological collections of the Carnegie 
Museum by a left mandible, No. 918. The specimen is doubtfully referred to the 
above species. It was found in the lowermost Nebraska beds on the Niobrara 
River, Sioux County, Nebraska. This horizon is undoubtedly of a much later age 
than the uppermost John Day of Oregon. The ramus is not in good preservation, 
but enough is present to determine its generic position. The following detailed de- 
scription answers closely to that of Bothrolabis trichexnus® Cope, but as there is no 
diastema back of p. it is well to temporarily associate the specimen with Bb. swb- 
equans. If subsequent study of better material proves this determination to be 
erroneous, the name 7. brachyceps may be substituted. 
The alveolar border for the incisors is entirely wanting, as are also the canine, 
the first, (@f there was a p,), and second premolars. Pg, is damaged, p, and 
m, are complete. M, is slightly broken, and mj, has lost its internal face. The 
angle of the jaw is broken off. The alveolus for the canine indicates a very 
robust tooth which corresponds perfectly to Cope’s description. The alveolar 
border is damaged just back of the canine, so that the absence or presence of 
pi cannot be certainly determined. Cope states that this tooth in B. subequans 
has one root, and has diastemata before and behind it, but the writer is inclined 
to think, in view of the considerably later age of the geological horizon in which 
the Nebraska specimen was found, that this tooth may in this specimen have 
* Proc. Am. Philos. Society, Vol. XLI, p. 118, 1902. 
5 In a paper now under preparation by the writer more complete data summing up the paleontological evidence on 
this question will be published. (See Annals Curnegie Museum, Vol. 11I., Part 4.) 
5 Proc. Amer. Philos. Society, Vol., XXV., pp. 74-77, 1888. 
