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Sloths to South America ; the Antelopes and larger Pachy- 
derms to Africa and Asia ; the Giraffe to Africa ; the Camel 
to Asia ; the Alpaca and its kindred to South America ; the 
Ostrich to Africa ; the Cassowary to Asia ; the Emu to 
Australia ; the Rhea to South America ; and the Apteryx to 
New Zealand ; the Gorilla to Africa ; the Orang Outan to 
Borneo. 
And though in most of these instances we can trace a 
peculiar and beautiful adaptation of organization in the 
animals to the countries they have been destined to inhabit, 
yet there are apparent exceptions to this rule, which our pre- 
sent limited knowledge will not enable us to explain. For 
instance, the localization of extinct Mammalia cannot be 
accounted for from peculiarity of climate, proper supply of 
food, or Physical Geography alone, as the limestone caves of 
Somersetshire and Yorkshire are equally suited to both 
Hyaenidse and Ursidse ; and as Mr. Boyd Dawkins well 
observes, the grassy downs and plains of Yorkshire and 
Somersetshire are equally suited to the ox and the horse. 
But if we examine the fossil remains of Herbivorous Mam- 
malia, a local distribution is observed which has not depended 
upon any cause with which we are cognizant. For while the 
remains of the Bovidae occur in greater abundance in all the 
Yorkshire caves, those of the Equidse preponderate in the 
West of England, as at Oreston and Wokey Hole. So that 
the ox preponderated over the horse in Yorkshire, at the 
same time that horses were more abundant than oxen in the 
plains of Somerset. 
And again, when we examine the remains of the extinct 
Carnivora the same difficult problem presents itself as regards 
the two genera I have already alluded to, the bears and 
hyaenas, which although found throughout Europe in the 
drift gravel or in caves, are not equal in point of num- 
bers, England differing from the rest of Europe in the 
