1915.] Matthew and Granger, Lower Eocene Wascich and Wind River Faunas. 99 
it seems advisable to name this form on this account and because it is the 
largest Lower Eocene creodont. 
An upper and lower molar No. 15259 from the lower Gray Bull valley are 
referred to this species. ° 
Measurements. 
Type No. 15228 No. 15259 
Pr? diameters: a--p: 0 Oh 6 yt ude aes 22.5 K 17.3 
P4 . be ueeee eee Cll ons Wie Wee Pat stan aaa es 26.3 X 26.8 
M!} . . Pe re ee 34.8 X 34.7 
M2 “4 eR Re eC Rte ene St WES NOT SORE olan 29.0 * 33.3 B12. 7X 84.7 
M? transverse diameter 26 a cee es 22.6 
P, diameters, pare x GER Re OU Re ate mi bea ree 2630 XAT :2 
Mi merase! Minh wes 8) yh pea Me ey aiet OR Lies 33.9 X 19.3 
M2 . io ape aerate nharst Buse rok ih Prk. diabetes OE ae ak 85, 4 18-0 
Astragalus, diameters (widiin longi 60.0 * 61.6 
: With BEOCIAONs 62 iE ki 32.9 
Lunare, diameters (width < height)............... 25.8 X 26.0 
*.. Gepih (AGreOsDIANI RT oe, ios ee 50.0 
Proximal phalanx, teeta ea es 39.0 
ACEI Gr Se ae Ns eh 21 
This genus is represented in the Soissonais by a species which Dr. 
Boule? finds indistinguishable from P. gigantea on the materials available for 
No, 15228 ; A.M, 
Fig. 86. Pachyena gigantea ponderosa, lower teeth of type specimen, ps—mz, two-thirds 
natural size. Gray Bull beds, Big Horn Basin. 
comparison. Dr. Trouessart gave the specimen the name of P. bowler two 
years later,’ but without specifying any distinctions, or reasons for separat- 
ing it from P. gigantea. Boule’s figures show it to be very closely allied to 
our species, and so far as comparisons can be made, indistinguishable. I 
presume that Dr. Trouessart’s separation of P. boulei is based upon the 
improbability, real or supposed, of the same species occurring in Europe and 
North America; an argument which to my mind may properly be used to 
1 Increased by crushing of the tooth. 
21903. Le Pachyena de Vaugirard. Mem. Soc. Geol. Tr., Vol. X, fasc. 4, Mém. no. 28, 
pp. 1-16, pl. i, ii (xiv, xv). 
3 1905, Catalogus sinin ov catwaibiae Quing. Suppl., p. 163. This is the only reference that I 
have been able to find. 
