242 O. C. Marsh—New Tertiary Mammals, 
Length of skull, from front ae incisors "a end of ree 
condyles, - --- - eee p SSE a ae iat 2 ar eee ee 
Extent of entire upper ‘dental series, . peas eae: ee 
mncent of upper molar series,: 2. 255-5... 255-1... OF 
peacent ot three trae molars, ....: 2. 6... 2 Sse ee ee 59° 
Antero-posterior diameter of penultimate upper molar,..  20°5 
Transverse diameter (greatest),......-.--.----------. 35° 
Antero-posterior osc of last upper premolar, --- -- 12° 
PMG OI eo ns Se eee ws 4 4° 
Antero-posterior ctyegnya of base of gliriform upperincisor, 22° 
PN VOTAO COINOLOR Gute... tao cess 108 
Distance between bases of upper canines,......-----.- 35° 
wxtent of lower dental series... i... b.-. ce. eae oo 168" 
Extent of last three lower molars Poca. 5 os pesados 70° 
Extent of entire lower molar series,_..-.._.--.------ 93° 
ge ahaa ae diameter of hin gliriform i incisor,.... 21° 
eee ee ate ewekcs 15° 
Transverse ianieter "of condyle of lower jaw, ---- ----- 52° 
Re PR ie feeds wn. i edb 170° 
Transverse diameter of humerus at distal ee 76° 
Transverse diameter of tibia at proximal end, ---- - ---- 59° 
pepe ee ene i lc. ea te i= 
Rite Or Os MUCCROEIDAL 6 ooo ck ae 40° 
Length of second metatarsal,.... ..2....2...-....... 46° 
Length of ungual phalanx,...... ..........--------- 35° 
idth of aittodiae 7 Sai aaiskig ra tip Ragtime sae kenge see 12°5 
Vertical diameter, ---. _- 14° 
The remains here described indicate an animal about two- 
be a as large asa Tapir. They are from the Dinoceras beds 
cene of Wyoming. Anchippodus minor Mars 
Sina castoridens Leidy) is from a lower horizon of the same 
formation. Both belong to the order 7t/lodontia. 
Diceratherium armatum, gen. et sp. nov. 
The present genus is of special interest, as it includes the 
first extinct rhinoceroses with horns foueds in America. It is 
indicated by large osseous protuberances on the anterior pol 
9 of the nasal bones. The latter are massive and firm! 
dssified, evidently to s rt well developed horns. The 
vc fating Po of the skull, peer he teeth, as well as the skeleton, 
so far as known, resemble the corresponding parts in Acera 
rium. The den al formula appears to b 
“a 8 4 1 3 
cisors = canines >, premolars 3: molars <- 
