1881. 385 
(Cope. 
fossa. Its internal extremity is broken off. Posterior to, and in contact 
with it, the posterior cingulum rises in a crest, which occupies the internal 
half only of the border. Its inner border is imperfect. It appears to me 
to be probable that the normal] posterior crest is turned posteriorly on itself 
so as to give the ‘‘ pot hook’’ shape seen in the anterior crest of the fourth 
permanent premolar. The corresponding accessory crest in the fourth 
temporary premolar appears to have been distinct at its internal extremity. 
The second true molar has a more oblique posterior external crest, and the 
posterior internal is oblique and simple. It has narrow anterior and pos- 
terior basal cingula. There is no tubercle between the inner bases of the 
transverse crests of this or the last true molar. The latter is characterized 
by the rudimental character of the posterior external crescent crest, which 
is shortened like that of Hyrachyus. The transverse crests are curved 
backwards; the posterior is short and simple. 
The canines are small, and are directed forwards. The extremity of the 
muzzle being broken, the relation of the incisors cannot be stated, but 
there was not probably any precanine diastema. An incisor preserved has 
the crown transversely expanded, and rather oblique. 
The third and fourth inferior premolars are the deciduous ones, and are 
both three-lobed, but differ in the forms of the anterior lobe. In the third, 
it is narrow and incurved, as in the corresponding permanent teeth of some 
Artiodactyla. The transverse crests of the true molars are rather oblique, 
running forwards as well as outwards. 
Their external extremities are bent at right angles, and there results a 
short descending crest running forwards and inwards; the anterior one 
turns inwards, again forming a transverse anterior ledge. No cingula on 
internal or external bases of crown ; a rudimental posterior one. 
Measurements of Cranium. M. 
Length from front of canine tooth to end of occipital 
CONAYleS . 1... eee eee eee eee eet w ete e ees .128 
Length from same to postglenoid process...........--- .096 
Ss ae «to end of last molar............---- .069 
s «s ‘* to first premolar..... sgasa News teas 015 
s ee “* to line of front of orbit........-...- 044 
Width between superciliary borders........--....-+++ 046 
“of zygomata at orbits. .....--..- eee eee ee eee 064 
“of brain-case at glenoid surface..........-.+++- 048 
«of occipital condyles......---.-+eeeee reer eee 023: 
«« of basioccipital bone between ossa petrosa...... .006 
Distance between postglenoid and posttympanic pro- 
CESSES... 6... eee ee eee roihearauenass deeds genase se 014 
Depth of occiput behind......-..... 0. see seen eee eee ee 088 
“of mandible from condyle. ...--..+-++-+2 seer 040 
“of mandibular ramus at third premolar......... .014 
‘at diastema (axial) .......cee eee e eee teens .009 
Least width of symphysis..... aise Seeuasorinecs PERE R UES N O11 
