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allied to the Peceari, A fragment of a lower jaw of the same genus, 
found by Mr. Darwin Fox in the Isle of Wight, confirms this view, 
but indicates in some points an approach to the carnivorous type. 
And it was remarked as interesting, that the living genus of the hog 
tribe which most resembles the Cheropotamus, the Peccari, exists 
in South America, where the Tapir, the nearest living analogue of 
the Anoplothere and Paleothere, the associates of the Cheropo- 
tamus, also occur. Another jaw, found by Mr. Pratt in the Binstead 
quarries in 1830, and resembling that of the Musk Deer, Mr. Owen 
refers to a new species of Cuvier’s genus Dicobune, under the name 
Dichobune cervinum. Mr. Owen has also given us a description of 
Lord Cole’s specimen of Plesiosaurus macrecephalus, which he com- 
pares with Mr. Conybeare’s Plesiosaurus Dolichodeirus, by establish- 
ing an intermediate species, founded upon a specimen existing in 
the British Museum, and termed by him Plesiosaurus Hawkinsit. 
Besides tracing the analogies which connect these with each other, 
and comparing them with the two great modifications of the saurian 
tribe, the crocodiles and the lizards, Mr. Owen presented his remarks 
on the form of the Plesiosaurian vertebre, founding them upon a 
general view of the elements of which all vertebree are constituted. 
To the communications thus made to us, we may add Mr. Owen’s 
determination of another animal, of which the remains brought from 
the neighbourhood of Buenos Ayres, are among the many treasures 
of this kind which we owe to Sir Woodbine Parish. This animal, 
of gigantic dimensions, appears to have been allied to the Megathe- 
rium, but with closer affinities to the Armadillos; and it probably 
possessed the characteristic armour, of which, in the Megatherium, 
the existence is perhaps problematical. Mr. Owen has termed it 
Gilyptodon, from the furrowed shape of its teeth. 
In another communication Mr. Owen endeavoured to account for 
the dislocation of the tail of the Ichthyosaurus at a certain point, 
which is observable in many of the fossil skeletons of that animal. 
This circumstance, so remarkable from its general occurrence, and 
which Mr. Owen was the first to observe, he is disposed to account 
for by supposing a broad tegumentary fin to have been attached to 
the tail for a portion of its length, the position of which fin must, 
he conceives, have been vertical. 
I-cannct close my enumeration of the valuable contributions for 
