PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 263 
Quarries, ‘University Hill” Quarry). This bone is very heavy, short, and much arched 
in the dorsal direction. A calcaneum of nearly an equally large carnivore was 
found in the same horizon north of the Niobrara River in this general locality and 
is illustrated on page 262, Fig. 57. The remains indicate the presence of these 
large carnivores in the fauna found in these quarries. 
MEASUREMENTS. 
Mm. 
Greatest length of humerus 
Greatest antero-posterior diameter of head... 87 
Greatest transverse diameter of head... 68 
Greatest length of Me. V.. 63 
Greatest length of caleaneum. 90 
Greatest transverse diameter at sustentacular facet ........0...cc.seccssessevsceccooncssesenecssessecdocssecasees 45 
Borocyon* robustum gen. et sp. nov. 
Type: (No. 1918, Carn. Mus. Cat. Vert. Foss.) Front of right ramus, caudal 
vertebra, fragments of manus, part of hind limb and foot, and various other fragments. 
Horizon: Miocene, Upper Harrison beds. 
y: Whistle Creek, Sioux County, Nebraska. 
Mr. T. F. Olcott, while engaged with the Carnegie Museum party in 19085, dis- 
Locali 
covered and collected this specimen about four or five miles southeast of the Agate 
Spring Fossil Quarries. As indicated above it was found in the upper Harrison beds. 
Although the type is fragmentary it enables me to give some characters which may 
be regarded as of generic value. The type is perhaps more closely allied to such 
forms as Amphicyon sinapius Matthew from later horizons than to A. americanus, A. 
ursinus, or any of the European forms with which it has been compared. ‘The jaw 
is undoubtedly quite short and heavy, and the premolars are of considerable size 
when compared with A. wrsinus. The portion of the jaw preserved compares fairly 
well with Mlwrodon tawoides Hatcher, but the canine is heavier and Py has no pos- 
terior cusp as in that species. A. meandrinus had the jaw proportionally longer in 
front of Pz than the present genus. It is, of course, quite provisionally that this genus 
is placed in the Daphenus-Daphenodon phylum, but pending the discovery of more 
complete material it would seem most satisfactory from the study of the limb and 
foot structure to regard the genus as a later member of this aberrant line. The 
material represents an animal nearly the size of a fully adult lion. 
Generic characters. Canine proportionally large and oval in cross-section, Py single- 
rooted, Px low-crowned with protoconid well anteriorly, no posteriar cusp, and a large 
* Bopoc = greedy; xbwr = dog. 
