M. 
Width just below neck................. 0.0 e eee eee O17 
OS Ot TMI G ss sis wus ee dda ele ae ak Pema O11 
> OS. CMVOMLGY ve deraues Reema ened olen ue 019 
Of MmOchleds i syiewedingaw yee Veea ae remo .009 
Longest chord of condyles and trochlea.............. -019 
The remains of this species were found together by the writer in the 
Bridger beds on Black’s Fork, Wyoming. 
ANAPTOMORPHUS. Cope. 
Proceedings of the American Philosophical Society, 1872, p. 554. 
This genus is represented by the left ramus mandibuli of a single 
species. The posterior portion is broken away, and the teeth remaining 
perfect are the P. M. 2, and M.1and2. The ramus, though small, is 
stout, and deeper at the symphysis than at the last molar. What appears 
to be the dental foramen is nearly opposite the bases of the crowns of the 
molars. The mental foramen issues beneath the first premolar. 
Dentition of the ramus mandibuli, In. 2, C. 1, P.M. 2, M. 8, total, 16. 
It differs in many respects from these; there is no interruption in 
the series near the canine, and the symphysis, though massive, is not 
coéssified. Further details are, the last molar is three-lobed and 
elongated behind. The composition of the crowns of the preceding 
molars consists of four opposed lobes, which are very stout, and con- 
nected transversely by a thin ridge bebind, or in close contact in front. 
The premolar tooth which is best preserved, is a perfect second, which, 
while having two roots, possesses a crown which stands almost entirely 
on the anterior, presenting a curved sectorial crest forwards and up- 
wards. 
The dentition is more decidedly quadrumanous in this genus than in 
the last, and it might be referred decidedly to Lemuride were it not for 
the unossified symphysis. It no doubt represents a distinct group or 
family from Tomitheriwm, and one more nearly related to the existing 
types of Madagascar and South Africa. 
ANAPTOMORPHUS ZMULUS. Cope, loc. cit. 
This species was about as large as a marmoset or a red squirrel. The 
enamel of the teeth is entirely smooth. 
Measurements. 
M. 
Length dental line..........0 6.0.0 eee eee eee tee 0.0148 
‘© of last molar............0.02 eect eee 0030 
“6 ante-penult..........0 22 eee eee eee ees 0025 
Width “ 9 ohegepe at nebo Vicaregeeee x anes 0020 
Length of three molars preserved....-.....+++++-+++ 0070 
From the Bridger Beds of the upper valley of Green River. 
