1895.] Geology and Paleontology. 577 
Dinictis bombifrons, sp. nov. 
A nearly complete skull and mandible, (number 10502 in the 
Princeton museum) collected from the Lower Oreodon Beds by W. H 
Burwell establishes a second species new to science. Unfortunately 
there are no other parts of the skeleton associated with it, but its size 
and peculiar shape are sufficiently characteristic to distinguish it at 
once from the species already described. 
Comparing this skull with that of D. felina, which is the type of the 
genus, it is considerably larger and proportionately longer in the pos- 
terior region. At thesame time it is not so high, consequently the angle 
of the parietals with the frontals is greater. The most striking feature 
is the post-orbital constriction which is situated further back of the 
post-orbital processes than in D. felina and is more pronounced, being 
only 31 mm. in transverse diameter. This is the concomitant of a 
smaller cerebral capacity. On account of the cerebral fossa being less 
dilated, the zygomatic processes appear more distinct and the sagittal 
crest is higher. The frontals are bulging and in consequence there is a 
median depression. This conformation would seem to indicate an en- 
largement of the frontal sinuses. The nasals are broad and extend 
behind the maxillo-frontal suture, their line of union with the frontals 
forming a nearly perfect semi-circle. The infra-orbital foramen is de- 
pressed well into the maxillary. Tho premaxillaries with the incisors 
are absent from the specimens and the anterior portion of the maxil- 
laries is weathered away, leaving the fangs of the large canines exposed, 
The hard palate does not differ materially from that of D. felina. The 
opening of the posterior nares is broad in front but narrow further back 
where the pterygoyds curve inward. The basal region is slightly 
longer in proportion, the paroccipital processes are more developed 
and are acute. The occipital condyles are much heavier. The foramen 
magnum is smaller and is nearly round. The supra-occipital is 
produced posteriorly so that its surface looks downward. The sagittal 
crest and lambdoidal ridge are thin and high. As seen from above 
the lateral margins of the occiput are parallel and the inion is regularly 
curv 
The mandible is longer, corresponding with the elongation of the ` 
skull and the flanges are low and heavy. The dentition is not essen- 
tially different from D. felina except in the large, compressed superior 
canines, The superior molar is somewhat reduced, the second inferior 
molar has a single root and is just on the point of disappearing, and 
there is a short diastema between the second and third premolars, but 
these characters may not prove constant. The postero-internal cusp of 
