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PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [May ICJIO,. 



use of them as a means of comparison between man and the 

 other Primates. Certain features in the patterns are shown to be 

 distinctive of all the Catarrhine monkeys, including the Man-like 

 apes and Man himself. The closest resemblance is found to exist 

 in the case of the orang, chimpanzee, gorilla (fig. 8, p. lxxv), and 

 Man (fig. 9). The great toe of Man presents a marked difference 

 of pattern, which is explained as a recently acquired adaptation 

 to the erect position. The degrees of resemblance between the 

 patterns presented by the different members of the Primates have 

 afforded material for the construction of the following genealogical 

 tree : — 



An elaborate study of the femoral arteries and their branches in 

 the lower Catarrhine apes, lately undertaken by Dr. H. Bliintschli, 1 

 has revealed many points of resemblance between these apes and 

 Man as regards the distribution of these vessels. Semnopit7iecus, in 

 particular, presents many human characteristics, even in cases where 

 the Cercopithecini are divergent. This genus, indeed, makes a 

 remarkable approach to Man in several other respects : the discoidal 

 placenta, for instance, is not infrequently single, the interorbital 



1 ' Die Arteria femoralis & ihre Aste bei den niederen Catarrhinen Affen. 

 Morph. Jahrb. vol. xxxvi (1907) pp. 276-461. 



