548 DESCRIPTION OF A NEW SPECIMEN OF GLYPTODON 
suture persists in the new specimen, I conceive it to have been a 
younger animal. 
The anterior nasal aperture is trapezoidal, and narrower below 
than above. The vomer is very thick and strong, and the turbinal 
bones are well developed. The premaxilla, though small slender 
bones, enter largely into the lateral boundary of the nasal aperture. 
Inferiorly they are separated in the middle line by a narrow fissure, 
which runs back into the crescentic anterior palatine foramen. 
The maxillary bones are extremely elongated ; while the palatine 
bones are small in proportion to them, and, like the premaxille, are 
separated by a very narrow median fissure. The extreme length of 
the roof of the palate, formed by these three pair of bones, is 10 
inches ; while its width (between the inner edges of the teeth), 
though rather greater in front than behind, nowhere exceeds 17 inch. 
From before backwards the palate has a double curvature, being 
concave downwards from the anterior end of the premaxilla to the 
level of the third tooth, and convex thence to the end of the palate- 
bones ; so that the posterior part of the palate has a very marked 
inclination upwards and backwards. 
There were eight teeth in each mawilla, all trilobed, the longitu- 
dinal grooves separating the lobes being less marked in the anterior 
teeth. 
The mandible is represented by the two horizontal rami, with the 
symphysis, the greater part of the right coronoid process, and the 
entire right condyle, together with many of the sixteen teeth. It 
very closely resembles the mandibles of Schzstopleuron gemmatum, de- 
scribed by Nodot, but is wholly unlike the restored jaw of Glyptodon 
clavipes given (on the authority of a drawing) by Professor Owen! 
The articular surface is situated almost wholly upon the anterior 
surface of the condyle of the mandible, looking but very slightly 
upwards ; it is transversely elongated, slightly concave from side to 
side, and convex from above downwards. In all these respects it 
furnishes a counterpart to the glenoid articular surface of the tem- 
poral bone of Glyptodon clavipes, already described by Professor 
Owen. 
The length of the head of the present specimen when entire, was 
probably not less than thirteen inches. The greatest depth of the 
cranium, from the centre of the frontal bone to the middle of the 
palate is about 6 inches ; the length of the mandible can hardly have 
been less than 12 inches. 
1 The mandible of the Turin GZyf/odon, mentioned at the end of this paper, is quite 
similar to that of the new specimen, and to that of M. Nodot’s Schéstopleuron. 
