202 THE GEOLOGIST. 
kinds of stao-s, especially tlie muntjac, differing from tliem in tlie 
persistency of its horns. Although the Palaeotragus is very large, 
there are others found in Pikerimi much larger.*' 
M. Gaudry showed two skulls which proved that in all probability 
the two species named by M. Wagner Antilope s^eciosa, and 
A. Pcdlasii were one and the same. 
This new fossil reminds one, by its form, its proportions, and the 
position of the axes of the horns, of the sub-genus Damalis ot 
of Hamilton Smith, and even more of the sub-genus Onjx of de 
Blainville, in which, following Ogilby's example, he includes the 
sub-genus Aigocerus of Demarest, now called Hippotragus ; but 
it differs from both in its dental system. 
M. Graudry has also discovered the bones of an antilope taller 
than any of those of which the skeletons are in the museum at Paris, 
even including the Oreas canna : he proposes to name this Palceoryx. 
A very similar skull, though much smaller, has also been found by 
him. Besides the difference in size, the horns are more massive in 
proportion to the size of the head, and flatter. This species he has 
named Palceoryx ^arvidens. 
On tlie Substances Worhed by the Primitive Inhabitants of Gaul. 
M. Robert has presented to the Academy of Sciences a supplement 
to his geological researches on the substances, more particularly stones, 
worked by the primitive inhabitants of Gaul. 
In his preceding memoir he had suggested that the enormous 
blocks of stone found suspended, as it were, in the centre of fluviatile 
deposits, could only have got there by means of icebergs at the time 
of the breaking up of the ice on the river which flowed through 
primitive France. 
It supported of this opinion that all the Latin authors agree in stating 
that the climate was very cold at the time of the conquest, and that 
the rivers were often sufficiently frozen over to -allow the Gauls to 
move easily from place to place, whence one can infer that when the 
thaws arrived, occasions were furnished to the liberated ice to carry 
boulders along with it. 
As stated in that previous memoir, M. Robert affirms that the 
deposits along the rivers in which the Celtic remains have been found 
have been formed by the water which previously filled the valleys. 
He furthermore adds, that the great thickness of the beds of soil, 
which cover the Celtic remains, shows that a very long period has 
elapsed since their deposit. 
M. Robert does not admit that the first men in Europe were con- 
temporaneous with the great pachyderms, the elephant, mastodon, 
rhinoceros, &c. On the contrary, he considers that an enormous 
lapse of time separated their epochs ; for the remains of those found 
with the Celts are very much rolled and worn, while the bones of 
the auroch, horse, &c., are with difficulty distinguished from those of 
the present day. 
