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DISTRIBUTION OF EXTINCT ANIMALS. [part ii. 
than wolves ; two species of Galera, a genus now confined to tlie 
Neotropical region ; two bears, and an extinct genus, Arctodus ; 
an extinct species of racoon ( Procyon ), and an allied extinct 
genus, Myxophagus— show, that at a very recent period North 
America was better supplied with Carnivora than it is now. 
Remains of the walrus ( Trichechus ) have also been found as far 
south as Virginia. 
Cetacea. — Three species of dolphins belonging to existing 
genera, have been found in the Eastern States ; and two species 
of Manatus , or sea-cow, in Florida and South Carolina. 
Ungidata. — Six extinct horses ( Equus ), and one Hipparion ; 
the living South American tapir, and a larger extinct species ; a 
Dicotyles , or peccary, and an allied genus, Platygonus ; a species 
of the South American llamas (, Auchenia ), and one of a kind of 
camel, Procamelus ; two extinct bisons ; a sheep, and two musk- 
sheep ( Ovibos ) ; with three living and one extinct deer ( Cervus ), 
show an important increase in its Herbivora. 
Probosddea. — Two elephants and two mastodons, added to this 
remarkable assemblage of large vegetable-feeding quadrupeds. 
Rodentia. — These consist mainly of genera and species still 
living in North America ; the only important exceptions being a 
species of the South American capybara ( Hydrochcerus ) in South 
Carolina ; and Praotherium, an extinct form of hare, found in a 
bone cave in Pennsylvania. 
Edentata. — Here we meet with a wonderful assemblage, of six 
species belonging to four extinct genera, mostly of gigantic size. 
A species of Megatherium , three of Megalonyx , and one of 
Mylodon — huge terrestrial sloths as large as the rhinoceros 
or even as the largest elephants — ranged over the Southern 
States to Pennsylvania, the latter {Mylodon) going as far as the 
great lakes and Oregon. Another form, Ereptodon , has been 
found in the Mississippi Valley. 
Marsupialia. — The living American genus of opossums, Didel- 
phys , has been found in deposits of this age in South Carolina. 
Remarks on the Post-Pliocene fauna of North America. — The 
assemblage of animals proved, by these remains, to have 
