1880. ] Geology and Palecntology. oe 
GEOLOGY AND PALAIONTOLOGY. 
Tue Bap Lanns oF THE WinD RIVER AND THEIR FAUNA.— 
These bad lands are situated in the upper drainage basin of the 
Big Horn river in Western-central Wyoming. Dr. Hayden, who 
first reported their existence, has referred them to the Wasatch 
ocene (see AMERICAN NATURALIST 1878, p. 831). Explorations 
which I have recently set on foot and placed in charge of Mr. J. 
_L. Wortman, have resulted in the discovery of an interesting 
fauna, which quite confirms Dr. Hayden’s determination of the 
age of the formation. Mr, Wortman has obtained nineteen species 
of Mammalia, of\which nine are new to science, and five have been 
already found in the Wasatch beds of New Mexico. The follow- 
ing list is given preliminary to further remarks. Rodentia (1-2); 
Plesiarctomys,two species. Mesodonta; Hyopsodus, Pantolestes,and 
Lomitherium, one species each (5). Chiroptera. 
(6) Vesperugo anemophilus sp. nov. Represented by the ante- 
rior part of a skull without lower jaw. Dentition, I. ?C.1; P-m. 
; M. 3. Posterior molar narrow, its posterior external V. rudi- 
mental ; first and second molars subequal. Fourth premolar ele- 
vated and acute, with an external basal cingulum; second pre- 
molar simple, acute. Profile steeply elevated behind orbital 
region, less steep in front of it; zygomas wide. ength from 
interorbital region to above canine alveolus in front .o10; inter- 
orbital width .oo5 ; width of zygomas .o12; do. between outsides 
of last molar teeth .010; length of molar series .008; do. of true 
molars .004. 
Creodonta. (7) Protopsalis tigrinus gen. et spec. nov. Char. 
gen. Probably Oxyenide} but as the type species is only known 
from two true molars and a canine of the inferior series with bones 
of the skeleton, this point remains to be ascertained. Femur with 
a weak third trochanter. Inferior molars, one like those of Oxy- 
VOL, XIV.—No, X. 48 
