O. C. Marsh—New Tertiary Mammals. 209 
tally in the penultimate molar. The rami were apparently not 
codssified, cr ; 
Measurements. 
Antero-posterior diameter of last lower WOIST io 55 5st ss Bee 
Transverse TANCE ois cap ene cee a ee 
Antero-pesterior diameter of penultimate lower molar,..... 4°8 
PAYORSO HBMGLED, oc oii cus Fuss eee h cs eens 5k els 1 3:1 
Depth of jaw below first lower premolar,........-...+++: 6° 
This unique specimen was found, in September last, near 
Henry’s Fork, by Mr. J. F. Quigley, of the Yale party. 
Anisacodon elegans, gen. et sp. nov. 
Another genus, nearly allied to the preceding one, may be 
established on a lower jaw with teeth, which belonged to an 
animal about the same size as the one last described. In the 
Present specimen, the last lower molar is smaller than the pen- 
ultimate. In both, the cavities between the cusps are much 
More deeply excavated than in the same molars of Passalacodon, 
and the small intermedial tubercles are less prominent. 
Measurements. 
qitero-posterior diameter of last lower molar, ..........-- tb en aa 
pueverse diameter, . ... <5.) ico cours cotus ave k 160d) et 3°9 
Trt Posterior diameter of penultimate lower molar,.....4°6 
mer eree diameter... 0 ce ve ewe ee curls Pies vs Be 
Depth of lower jaw on posterior face below last molar,....6°5 
The only known specimen of this tee was found, last au- 
‘umn, by the writer, near Henry’s Fork, Wyoming. 
Centetodon pulcher, gen. et sp. NOV. 
tooth 
fetes, although probably there is little affinity between the 
two genera. The posterior part of the crown 1s formed by a 
Jour. Scr.—Tairp —— Vou. IV, No. 21,—Sepremper, 1872, 
