0. C. Marsh—New Tertiary Mammals. 127 
Measurements. 
Extent of last three upper molars, - - - -- ee ices a 
An ror ee of first upper true molar, --.-- 9°6 
Transverse diam wo Uke eee ee 
Aoteroposteron diameter of last upper molar, is 
Trans nsverse diameter de nthwind awk LAGE KE ie tan ees 12°5 
The specimens on which this species is established were dis- 
covered at Grizzly Buttes, near Fort Bridger, in September 
last, by Mr. J. F. Quigley and the writer. 
Viverravus gracilis, gen. et sp. nov. 
A much smaller carnivor, about the size of the common 
Measurements. 
Exten t of pre-molar and molar series of lower jaw,-------: | roped 
ixtent of last three lower tee th, STEN, | 
a To-posterior diameter of last lower molar, . --- ------ 45 
*reatest transverse dia wipteth is jk ee Tee 25 
Autero-posterior — of penultimate lower tooth,...  5°2 
Teatest transverse diam: sh as 3:4 
Antero-posterior rar of upper sectorial molar, - --- -- 7 
2 The pe specimen of this species was discovered at Grizzly 
icc. ‘yoming; last autumn, by GG: Lobdell, Jr, of the 
Nyctitherium velox, gen. et sp. nov. 
One of the most reiea y discoveries of the last Yale 
SoS in the Tertiary of yoming, was the remains of a 
f bat, which is of jal i Sree as no fossil 
esimen The Cheiroptera has hitherto d 
htry 
the teeth 
ote convex lotisitudinadis= . 
