. The animans and man; an elementary textbook of zoology and human physiology. rld, in particular the chimpanzee and orang-outang, the disparity in size of brain is enormous. The lowest Primates are the lemurs, found in Madagas-car, in which island they include about one-half of all themammalian species found there. The brain is much lessdeveloped in the lemurs than in any of the other mon-keys. The monkeys and apes may be divided into twogroups, the lower, platyrrhine monkeys, found in the NewWorld, and the higher, catarrhine forms, limited to the OldWorld. The platyrrhine monkeys have wide n
. The animans and man; an elementary textbook of zoology and human physiology. rld, in particular the chimpanzee and orang-outang, the disparity in size of brain is enormous. The lowest Primates are the lemurs, found in Madagas-car, in which island they include about one-half of all themammalian species found there. The brain is much lessdeveloped in the lemurs than in any of the other mon-keys. The monkeys and apes may be divided into twogroups, the lower, platyrrhine monkeys, found in the NewWorld, and the higher, catarrhine forms, limited to the OldWorld. The platyrrhine monkeys have wide noses inwhich the nostrils are separated by a broad septum andwith the openings directed laterally. These monkeys aremostly smaller and weaker than the Old World forms and THE VERTEBRATES: MAMMALS 257 are always long-tailed, the tail being frequently prehen-sile. They include the howling, squirrel, spider, and ca-puchin monkeys common in the forests of tropical SouthAmerica. The catarrhine monkeys have the nose-septumnarrow and the openings of the nostrils directed forwards,. FIG. 134. Bob, a monkey of the genus Cercopithecus. (Photographfrom life by D. S. Jordan.) and the tail is wanting in numerous members of the include the baboons, gorillas, orang-outangs, andchimpanzees. These apes have a dentition approachingthat of man, and in all ways are the animals which mostnearly resemble man in physical character. CHAPTER XIXDOMESTICATED ANIMALS The animals that we call domestic while sometimes ofkinds and appearance very different from any wild animalsthat we know are yet certainly all descended from kinds thatare or were originally wild. There are wild pigs, wild goats,wild doves, wild ducks, wild silkworms! There are nowild dogs nor probably any longer any true wild horses butit is easy for us to see from what wild animals our tame dogsand horses have been derived. It is certain from the records of history, of ancient pic-tures and carvings and still more ancient bones
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