454 Transactions.— Zoology. 
that they have lost their point, and show a rugged horizontal apex, with a 
width of nearly a quarter of an inch. From behind the tooth the rami 
expand very little as far as the gape. 
A similar row of small teeth, as described as occuring in the first speci- 
men, exists also in the second skull, but there are apparently only seven- 
teen of them. Their position is exactly the same as that in the foregoing, 
the first anterior tooth standing exactly above the posterior base of the large 
tooth in the lower jaw. The teeth have the same form as those previously 
described, except that they are generally thicker. This becomes conspi- 
cuous with the seventh tooth, after which they gradually increase to the 
thirteenth, which is one-eighth of an inch thick at its base, and stands 0:45 
inch above the gums. They then keep nearly the same size to their 
posterior end. As the space on which these seventeen teeth stand is only 
4:25 inches long, besides their greater stoutness, they are far more crowded 
than in the first described skull. 
Owing to the fact that the gums have dried more effectually in this 
than in the two other skulls, in both of which the teeth stand erect with 
the curve of the apex directed inwards, the teeth in this skull are no longer 
in their normal position, but lie somewhat backward on the palate. 
The groove on the upper surface of the rostrum between the premax- 
illaries, is filled by a convex ridge of dense bone with a small channel on 
each side. That this is only caused by age, and that it is neither a sexual 
nor a specific character, is proved by the fact that the next skull, No. 8, which 
is doubtless a half-grown specimen of the same sex as the one under 
review, has this groove on the top of the rostrum still open, and thus 
resembles the skull No. 1, although, in the latter, that groove is narrower 
and more shallow. 
Photograph No. 2 has been added in order to show the relative position 
and size of the teeth in the upper and lower jaws of the specimen No. 2 
(aged male ?) 
The whole skull, when compared with the former, strikes us by its 
massiveness and stronger and stouter proportions. This will be still more 
conspicuous when the soft parts have been removed, so that its anatomical 
structure can be studied in detail. 
Skull No. 3. 
Assuming that the last-described skull belongs to an aged male, the 
measurement of the third skull under consideration must lead us to the 
conclusion that it is that of a young half-grown male. Beginning with the 
lower jaw, the same form as in the foregoing is observable, the rami ex- 
panding considerably as soon as we reach the neighbourhood of the alveolar 
eavity; and although the tooth in the same is only small, and stands only 
