Cranial Characters, &c., of the Snow-Leopard. 307 
by the occipital region, more particularly those connected. 
with the tympanic bulle, when compared with those parts 
in F, leo, tigris, pardus, and onca. 
The Succession of the Teeth. 
There is nothing noteworthy in the structure of the teeth 
of the deciduous set. 
In the smaller of the two skulls, measuring 125 mm. in 
basal length, the tooth-change has just started. In the upper 
jaw the two inner pairs of deciduous incisors have been shed 
and replaced by those of the permanent set, which are fully 
erupted; but the deciduous outer incisors are still in place, 
with the tips of the corresponding teeth of the permanent 
set appearing through the bone just behind them. 
The first deciduous premolar has been shed, pushed out by 
the crown of the permanent tooth, which, however, lies deep 
in its alveolus. 
The canines and second and third premolars of the 
deciduous set are in place and fully functional ; but the 
molar, lying some distance behind the last deciduous pre- 
molar, is through the bone, but not quite fully erupted. 
In this stage, therefore, the four median incisors, the first 
premolars, and the molars of the permanent set are cut, 
while the outer incisors, the canines, and second and third 
premolars of the deciduous set are still in full use. 
In the next stage, shown by the larger skull measuring 
131 mm. in basal length, the outer deciduous incisors have 
been replaced by those of tle permanent set, which are 
slightly higher than the rest of the series. 
The deciduous canines are shed and the permanent canines 
are half-erupted. 
The first permanent premolar and the molar are fully 
erupted, and the third permanent premolar (carnassial) has 
pushed out its small predecessor and is erupted nearly to the 
level of the deciduous second premolar, which is fully 
functional just in front of it, and is the only tooth of the 
deciduous set still retained. 
On each side of the upper jaw, therefore, the permanent 
teeth become functional approximately in the following 
order :—(1) the two inner incisors; (2) the first premolar 
and the molar together; (38) the outer incisors; (4) the 
canine and the third premolar (carnassial) at the same 
time ; (5) the second premolar. The deciduous teeth are 
shed in corresponding order, the last to fall being the second 
premolar (carnassial). ‘Thus the carnassials of the deciduous 
and permanent sets are functional at the same time. 
