Notice of two New Fossil Mammals. 141 
Arr. XII.—Notice of two New Fossil Mammals from Bruns- 
wick Canal, Georgia ; with observations on some of the fossil 
quadrupeds of the United States ; by R. seouineuia M. D. 
Unper the head Mreeatueripa, in the Penny Cyclopedia, Vol. 
15, there is an exceedingly interesting description of the fossil 
animals included under this family, by Professor Owen of Lon- 
don. This distinguished naturalist admits five genera, viz. Me- 
gatherium, Megalonyx, Glossotherium, Mylodon and Scelidothe- 
rium; to which might be now added the “ Orycterotherium” 
recently described by me in the Transactions of the American 
Philosophical Society. In this paper Mr. O. has constructed a 
hew genus under the name of “ Mylodon,’” from my description 
of the Megalonyr laqueatus, (vid. Med. and Phys. Researches,) 
together with an inferior jaw of another species obtained by Dr. 
Darwin, in South America; the former. be names Mylodon Har- 
lani, the latter Mylodon Darwinit. We have no objections to 
the construction of a new genus of the M. laqueatus, although 
we think there are scarcely sufficient data for the change under 
our existing knowledge of the remains of this extinct animal ;— 
as no new light has been added to its structure since the descrip- 
tion of the animal in the Medical and Physical Researches, 1835; 
from which we extract the following remarks :—“ It 
peculiarities of organic structure which certainly entitle it tot 
rank of a distinct species; indeed a minute examination of | 
tooth and knee-joint, render it not improbable, that if the whole 
frame should hereafter be discovered, it may even claim a generic 
distinction; in which case, either Au/azodon or Pleurodon would 
not be an inappropriate term; referring to the ribbed or fluted 
form of the mesial aspect of the tooth.” p. 330, : 
Mr. Owen has also made this extract from my paper, when 
making the new genus, and without adopting my generic name, 
which is very. applicable,—changes the name altogether to My- 
lodon Harlani. The Greek wése:, dentes molares, conveys no 
distinctive character whatever as applied to this animal; the 
English of Mylodon is “ molar teeth, tooth, ” and is equally ap- 
plicable to any fossil mammal with which we are acquainted. 
Pleurodon, on the contrary, would apply to this and to all of the 
Species descaitved under the name of Megalonyr Jeffersonii, M. 
