Abe 
is greatcr as Compared to the transverse and vertical diameters. The pre- 
orbital region is but little concave, and the anterior border of the orbit is 
above the posterior half of the first true molar. The molar teeth present 
a tubercle between the anterior lobes, and a weak cingulum extends round 
the inner base of the anterior one, and in the second premolar, round the 
base of both inner lobes. Thence it passes round the anterior base of the 
crowa and ceases in a tubercle which rises in contact with the anterior 
median crest. On the posterior side of the crown the cingulum in like 
manner terminates in the large three-sided posterior marginal tubercle. 
The anterior median tubercle-crest is well distinguished from the anterior 
inner tubercle and is directed very obliquely. The posterior median crest 
is continuous with the inner, and is well separated from the external 
crests. The external basal cingulum is robust, the columns are prominent, 
and the outer faces of the external crescents deeply impressed but with a 
well marked median ridge. The external cingulum and its margins is ru- 
gose; other parts of the enamel smooth. ‘The first premolar has two 
roots; the second premolar is as long as the fourth, and longer than the 
Jast true molar. 
Measurements. M 
Lota JGng th: OR CHM asccce tase needs een Reo 2280 
Length of dental series to first incisor...............45 147 
ss vee GUMTNC: crntapnede whixaeawes aide 180 
et molar ye Geeere ges edadigeme tees caves 100 
od PRCHTOMIS <5 har Soe ce etigeeeoe io gdca ROR Ges seetngaeet 053 
ne second premolar..............4. chante aeeee aOLO 
Width of ae e Se ed Eee 015 
“ srCO- op ne 
Diameter Heat tue ialan’ fs antero-posterior. ......-.- av fll i 
( tramsverse. ...... Pm MeuseeS 0165 
Bro- ior (135 
De metenat Mertens mlat f antero-posterior. ........... 9135 
ETAUSNETSO. Loss seb cneinies .0170 
From A. condoni Leidy, this species differs materially in the composi- 
tion of the superior molars In that species there are no inner tubercle 
and cingulum ; the anterior median crest is more completely separated ; the 
anterior cingulum does not cease with the anterior marginal tubercle, and 
the posterior marginal tubercle is linear, not trihedral. 
ANCHITHERIUM BRACHYLOPHOUM, sp. nov. 
Portions of the maxillary bones supporting molar teeth, indicate a spe- 
cies of the size of the A. cguiéceps, but differing in various respects. 
The median and inner tubercles are not deeply separated, and the for- 
mer are cut off from the external crescents by a deep fissure. There is no 
tubercle between the bases of the inner cones, nor is there any internal 
cingulum. The anterior cingulum does not develop a distinct tubercle, 
and does not extend to the anterior extremity of the anterior outer cres- 
cent, The posterior cingulum develops a large trihedral tubercle, and 
then extends nearly to the external crescent. The external cingulum is 
