2 
scribed a new genus and species as allied to Notharctus, Leidy, under the 
name of Tomitherium,* but made no suggestion as to its ordinal posi- 
tion. : 
On a re-examination of the last-named genus, I am satisfied that it also 
should be referred to the Quadrumana, and describe it as follows: 
TOMITHERIUM. Cope. 
Dental formula 22%, in an uninterrupted series. Last molars with 
five tubercles, others with four; all low and slightly alternating, the 
outer wearing into crescents. Canines quite small. Incisors very promi- 
nent, the median pair with transverse cutting edges. Symphysis codssi- 
fied, projecting in front. In the molars, the adjacent: horns of the two 
outer crescents unite with the anterior outer tubercle; the posterior 
outer is insignificant. There is a projection but no tubercle in front of 
the outer anterior tubercle. The premolars present but a single com- 
pressed conic crown; the posterior, however, widened behind, and with 
alow tubercle. The first and second premolars are one-rooted (not en- 
tirely a generic character). 
I base the distinction between this genus and Notharctus on the small 
canine, and the sub-horizontal position of the incisors; believing that 
when other portions of the skeleton are studied, other differences will 
appear. 
The portions of the skeleton of the type species preserved are: the en- 
tire dentition of the lower jaw minus the crowns of the outer incisor, 
canine and first premolar; the left ramus nearly complete, the extreme 
angle being wanting: the right humerus complete, witli right ulna and 
radius, the latter lacking the distal extremity; a large part of the left 
ilium; the right femur nearly entire; part of the left humerus, meta- 
tarsals, etc. 
The mandibular rami are quite stout, but not very deep; the sym- 
physeal portion long and oblique, and the coronoid and condylar portions 
elevated, with axis at right angles to that of the horizonal portion. The 
condyle is well elevated, and the coronoid process small; the dental 
foramen is half way between the margins of the ascending ramus, and 
opposite the bases of the crowns of the molars. The inferior margin of the 
jaw shows no tendency to inflection at a point immediately below this 
foramen, where it is broken off. The mental foramen is divided, the 
exits being at points opposite those between the premolars 1-2 and 2-3. 
The humerus has a round head directed backwards and a little out- 
wards. The tuberosities are rather small, of about equal size, and 
‘obtuse; they enclose a short bicipital groove. The bicipital crests are 
very largely developed, and extend to the middle of the shaft enclosing 
an open groove between them. The external is narrow and. most 
* Published August 7th, 1872. 
