Cope.] 78 [Feb. 17, 
occipital is flat posteriorly, but anteriorly it has an open shallow median 
groove, with a low ridge on each side. 
The occiput is damaged, but the lateral occipital crests descend to near 
the condyles without sending a branch to the zygoma. The posterior 
temporal ridge commences above the external portion of the occipital con- 
dyle. A single prominent angular ridge dividing the temporal from the 
orbital fossee continues from the postfrontal process to internal angle of 
the preglenoid boundary. The inferior sphenoid ala is continuous from 
this point to and with the pyramidal process of the palatine, forming a 
vertical plate flared outward at its superior border. The border of the 
posterior nares is about as far posterior to the last superior molar as the 
length of that tooth, and opposite to the posterior extremity of the maxil- 
lary bone. This is further posterior than in any of the other species. The 
zygomatic foramen is encroached on by the convexity of the inferior part 
of the lachrymal bone which is in this species subhorizontal, and not 
oblique as in the B. pristinus. It is therefore continuous with the zygo- 
matic expansion of the maxillary bone, and serves to place the posterior 
origin of the zygomatic arch much further back than in any of the other 
species here described. The outlines of the zygomatic arches are flat, and 
slightly wider behind than before. The palate is flat, except posterior to 
opposite the last superior molars. It then slopes upwards at an open 
angle. The premaxillary palatal face is a little decurved. 
As the animal described is old, the sutures are obliterated. 
The infraorbital foramen is above the middle of the second superior pre- 
molar, and is a vertical oval. The supraorbital foramina are small and 
close together, the space between them being one-seventh the interorbital 
width. There are two postpariétal foramina placed rather low down, the 
inferior on the squamosal suture. A very small supraglenoid foramen on 
the inner side of the zygomatic process. The foramen magnum is wider 
than deep if we except a deep notch of the superior border. The/. condy- 
loidewm is entirely distinct, and is a longitudinal ova]. The f. ovale is 
not distinct from the f. lacerum anterius. The f. postglencidewm is at the 
inner side of the postglenoid process. The meatus auditorius externus is 
lost with the zygomatic angle, but its canal is remarkably small. The f. 
palatinum is opposite the first true molor. The ff. incésiva are distinct 
from each other, and rather large, the two, with their septum, forming a 
CITELE, 
The incisive alveoli of the premaxillary are of moderate size, and the 
first and third are equal, and the second a little smaller. The canine 
alveoli are large and pedunculate ; the crowns are lost. The fourth pre- 
molar is separated from the latter by a diastema; it has a simple com- 
pressed crown, and is two-rooted. The third premolar is similar but 
larger, and is preceded and followed by diastemata, the former as long as 
itself, the Jatter a little shorter. The second premolar is like that of the 
other species of the genus. The first is wider than long, and has one ex- 
ternal and one internal cusp, and posterior and anterior cingula, the for- 
mer the wider. The crowns of the first two true molars have lost their 
