O. C. Marsh—New Tertiary Mammals. 211 
separated from the central pair of cones, and the inner anterior 
cusp has its summit distinctly cleft. The crown, also, is propor- 
tionally shorter longitudinally. There is a distinct basal ridge 
on the front and outer sides of the crown. 
Measurements. 
Antero-posterior diameter of last lower molar,........... 62 mm" 
Transverse diameter through anterior pair of cones,...... 3°6 
Transverse diameter through central pair of cones,....... 3°6 
ed 
er 4 
Height of anterior inner cusp above jaw,.....- 
The only known specimen of this species was found, last 
September, by the writer, near Henry's Fork, Wyoming. 
Bathrodon typus, gen. et sp. nov. 
In this genus, the first and second lower true molars have 
‘rowns with a similar composition to those of Limmnotherium, 
but the anterior pair of cusps are more elevated, and the poster- 
lor pair are nearly equal in size. The last lower molar is quite 
different from the corresponding tooth in that genus. It is 
more like the preceding molar with the addition of a posterior 
tubercle, which is near the inner margin. The present species 
18 based mainly on a portion of a lower jaw containing the last 
three molars, They indicate an animal about as large as Lim- 
notherium elegans Marsh, and one probably allied to that 
Species, 
Measurements. 
Kongitudinal extent of last three lower molars,......... 12h 
tero-posterior diameter of last lower molar,......-.-- 5° 
H Srevamee CIMMiGtEr cis ash h sin nk ck one es ke Coonan. 3°5 
eight of penultimate lower molar above jaw,....-..+ +: 2°6 
The only known remains of this species were found by Mr. 
F. Mead, Jr., at Grizzly Buttes, near ort Bridger, Wyoming, 
in September last. 
Bathrodon annectens, sp. nov. 
m it in having the anterior half of the crown narrower than 
the Posterior portion. The former is elevated, and has its inner 
®usp the highest. There is no distinct basal ridge. 
Measurements. 
antero-posterior diameter of last lower molar,.....+.--+ 53 = 
Tavsverse diameter in front,.....-- SOC GE Rae 3°4 
Tansverse diameter through posterior half,........-+-+ 3°5 
Depth of jaw on posterior face below last lower molar,. .10°6 
