THE MAMMALIAN FIFTH ARCH 505 



4. // CI typical 'fijth' arch actually exists, appearing after the pul- 

 monic arches are formed the latter vessels must he regarded as differ- 

 ing, to a certain extent, from the vessels anterior to them; and to this 

 extent the branchial nature of the pre-pulmonic caecum has become 

 modified. 



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THE AMERICAN JOURNAL OF AXATOMV, VOL. 12, NO. 4 



