. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 254 ANNALS NEW YORK ACADEMY OF SCIENCES States in the beginiiing of the Oligoeene, without direct ancestry in either continent, and is regarded by Peterson*^* as probably from an Asiatic NON - RUM I N A N T 5 PECCARIES- PIGSHIPPOPOT<^WI ANTF LOf t S CAr T L L PROCRESSIVC EI/OLUTION OF THE HIGHER CROUPS OF RUMINANTS NEOTROPIC/^L NE/ARCTIC PfiUtARCT/C ETM'OPIAnWoK/FNTAL Fig. 27.—Phylogeiiy and distributjon of the Artiodactyla Most of the families appear to liave originated in the Nearctic or Pala?arct
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 254 ANNALS NEW YORK ACADEMY OF SCIENCES States in the beginiiing of the Oligoeene, without direct ancestry in either continent, and is regarded by Peterson*^* as probably from an Asiatic NON - RUM I N A N T 5 PECCARIES- PIGSHIPPOPOT<^WI ANTF LOf t S CAr T L L PROCRESSIVC EI/OLUTION OF THE HIGHER CROUPS OF RUMINANTS NEOTROPIC/^L NE/ARCTIC PfiUtARCT/C ETM'OPIAnWoK/FNTAL Fig. 27.—Phylogeiiy and distributjon of the Artiodactyla Most of the families appear to liave originated in the Nearctic or Pala?arctic region and spread thence outwardly to the more peripheral regions. The higher types are of more recent origin and are still dominant in the Holarctica. TROBOSCIDEA The later Tertiary and Quaternary history of the mastodons and ele- phants agrees with the various groups that we have been considering in indicating Asia as the center of distribution of the race. Elephants are now limited to the Ethiopian and Oriental regions, but in the Pleisto- cene their range was over the whole of Europe, Asia and North America, as well as Africa. The northern species, although of smaller size, are more progressive than the southern species in the specialization of the teeth, proportionate length of tusks, shortening of skull with concomitant elongation of trunk. The more primitive mastodons first appear in India in the Oligoeene, in Europe in the lower Miocene, in North America in the middle Miocene. The intermediate stages leading to the mammoths and elephants are best shown in the Pliocene and Pleistocene of India; a less exact series may be found in N orth America. The mastodons reached South America in the Pleistocene; the mammoths and elephants never reached that continent. The earlier stages in the phylogeny of the Pro- ** O. A. : Mem. Carn. Mus., vol. iv, pp. 145-148. Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1879
