211 
Puatyonyx, Lund. 
This genus is proposed by Dr. Lund, to include a series of species 
discovered by him, the first three of which he had previously referred 
to the genus Megalonyz, and Prof. Owen, in the conspectus at the 
end of his memoir on the Mylodon, has placed them in his genus 
Scelidotherium ; but I prefer to adopt, for the present, Dr. Lund’s 
latest arrangement, since in the lower jaws figured, the last lower 
molar has a deep groove on its posterior side, and the fourth species, 
of which an entire skull is figured (tab. 38), agrees in this cha- 
racter, and shows a marked distinction from the S. leptocephalum in 
the zygomatic arch being incomplete ; the malar bone has no frontal 
process, and but a slight angular indication of the zygomatic process. 
P. Cuvieri. P. minutus. 
P. Bucklandi. P. Brongniartii. 
In addition to these, Dr. Lund represents a metacarpal bone of a 
species which he calls P. Owenii, and an os scaphoides of the foot of 
another, which he names P. Agassizii. 
The genera Ceelodon and Sphenodon of Dr. Lund seem open to 
the objection suggested by Prof. Owen, namely that the teeth would 
be first developed in the form of hollow obtuse cones, not assuming 
the cylindrical form until worn down to the part which has acquired 
in process of growth the normal thickness; but while I feel natu- 
rally cautious of introducing into my category any genera or species, 
the establishment of which is not made fully satisfactory to my mind, 
I must not be considered as rejecting any of those of Dr. Lund, 
when his illustrations and lists of names are the only evidences I can 
attain ; since his original specimens are far beyond my reach, and my 
ignorance of the Danish language prevents my comprehending his de- 
scriptive memoirs. 
Fam. 2. Dasyrpopip. 
The nasal bones long, of nearly uniform width, their extremities 
projecting forwards beyond the intermaxillaries ; the intermaxillaries 
are portions of cylinders, reaching further especially on their palatal 
surface than in the other families ; the maxillary bone swollen and 
provided with simple teeth ; its zygomatic process projecting boldly 
outwards, and a ridge continued from it for the masseter, the molar 
series diverging behind ; the posterior palatine foramina are replaced 
by a row of minute openings extending the whole length of the 
palate ; the malar bone, when there is a descending masseteric pro- 
cess, or a rudiment of one, has it compressed longitudinally, extended 
transversely ; the foramen rotundum is included in the foramen sphe- 
no-orbitarium ; the zygoma is flat, gently twisted upwards towards 
its extremity ; the mastoid bone with a deep narrow groove, con- 
taining one or more mastoid foramina; the basi-occipital bone with 
a transverse depression just anteriorly to the edge of the foramen 
magnum, and (excepting in the genera Tolypeutes and Glyptodon) 
with an articular surface upon the lower edge of that foramen 
receiving the odontoid process of the axis when the head is deflexed ; 
