408 O. C. Marsh—New Tertiary Mammals. 
Measurements. 
Space occupied by seven teeth in upper molar series,.... 77° ™* 
xtent of three true molars, ------ 41° 
PPR DOGWOR GIN. fos os co pe 62 
Distance between apices of horn rugosities, --.. -------- 27° 
Length of frontals on median suture,..-. -.------------ 62° 
Expanse of occipital condyles, .--...t...-..----------- 40 
The remains of this species at present known are from the 
Eocene of Wyoming. 
Dinoceras lucaris, sp. nov. 
This genus may be distinguished from Tinoceras Marsh (Ho- 
basileus Cope), by the anterior position of the maxillary horns, 
by the elevated parietal crests, by the short and arched dias- 
tema, and by the compressed and trenchant canine tusks. 
e present species, which may provisionally be referred to 
Dinoceras, differs from D. mirabilis Marsh,* aside from its 
larger size, in the structure of the upper molars. The penulti- 
mate has the inner posterior tubercle double, and the last true 
molar has a tubercle in the angle of the transverse crests, and 
also lacks the second posterior tubercle. The basal ridge 18 
perce on the inner side of each of the three upper pre 
molars. 
Meusurements. 
Epece occupied by upper molar series, wee DEE ee 
ixtent of last three upper molars,._--.--..---------- 93° 
Antero-posterior diameter of last upper molar, --------- 35°5 
Transverse diameter through posterior crest, ...-------- 38° 
The locality and geological horizon of these remains are @S- 
sentially the same as those of the preceding species. 
* This Journal, vol. iv, p. 343, and vol. v, p. 117. 
