174 
ON SOME NEW AND LITTLE KNOWN CRLODONIS. 
MEASUREMENTS. 
Length of ramus mandibuli 
Length of symphysis 
Lreadth of incisor alveoli . 
Canine, longitudinal diameter 
“ transverse “ 
Premolar 1, length (alveolus) 
“ 2 , “ 
“ 3, “ 
“ 4, “ 
Molar 1, length 
“ 2, “ . • . 
“ 3, “ (alveolus) . 
.098 
.028 
.006 
.009 
!oo6 
.004 
.006 
.006 
.009 
.011 
.008 
.004 
Genus PROTOPSALIS. 
V. PuOTOI>SALIS TIGRINUS (?), Cope. 
This very interesting and little known genus is placed by Professor Cope between 
Oxi/mut and Pterodon, a determination which is in accordance with the known facts 
of its structure. It differs from the latter genus in the fact that at least one of the 
lower molars has an internal cusp, and from the former in the absence of such a cusp 
from the last lower molar. Frotopsalis has hitherto been found only in the M'ind 
River l)eds, hut in 1885 the Princeton party obtained a large creodont in the Bridger 
basin, which shoidd probably be referred to here. The bones indicate a large animal of 
great mu.scular development. A fragment of the humerus shows a heavy shaft with a 
vcr>- i)rominent deltoid ridge extending nearly its entire length ; the supinator ridge 
is likewise very conspicuous and a large epicondylar foramen is present. The radius 
has a transversely extended head, divided into two nearly equal concave facets, 
which must have covered the entire humeral trochlea ; the shaft is hea\y and flattened 
and shows jirominent ridges for muscular attachments. Of the femur the articular 
surfaces are wanting, but so far as it is preserved, it agrees almost precisely Avith 
Profes.sor Cope’s figure; it is a long and heavy bone of transversely oval section. 
'J he fragments preserved indicate that the hind limb was considerably longer than 
the forc-hmh. The navimdar is. small with a deeply concave fiicet for the head of 
die i^tragudus. The mdmd resembles that of Oxyema in having a large oblique facet 
for the calcaneum and at an acute angle with this another for the astragalus. Meta- 
tarsal III s^ws that the foot was lighter and Aveaker than Professor Cope has 
supiKAsed. l\x^^phalan<jes are stout and depressed, andean ungual is thick and 
ounc ed, somewhat hke that of a dog. Unfortunately the distal end is broken off so 
lotlml”;.^^ ^ -tebra indicates a 
