. The Deseado formation of Patagonia . rgen., t. 18, p. sorondoi Amegh., 1902, Anal. Mus, Nac. Buenos Aires, ser. 3, t, i, p. sorondoi Amegh., 1906, Anal. Mus. Nac. Buenos Aires, ser. 3, t. 8, p. roiucri Lydekker, in part, 1894, Anal. Mus. La Plata, Paleontologia Argen-tina, t. Ill, supplement, p. romeri Gaudry, in part, 1909, Anal. Pidcoutologie, t. 4, p. giganteum Amcgh., 1897, Bol. Inst. Gcog. Argen., t. 18, p. crassidens Amcgh., 1902, Anal. Mus. Nac. Buenos Aires, ser. 3, t. i, p. planum Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p.


. The Deseado formation of Patagonia . rgen., t. 18, p. sorondoi Amegh., 1902, Anal. Mus, Nac. Buenos Aires, ser. 3, t, i, p. sorondoi Amegh., 1906, Anal. Mus. Nac. Buenos Aires, ser. 3, t. 8, p. roiucri Lydekker, in part, 1894, Anal. Mus. La Plata, Paleontologia Argen-tina, t. Ill, supplement, p. romeri Gaudry, in part, 1909, Anal. Pidcoutologie, t. 4, p. giganteum Amcgh., 1897, Bol. Inst. Gcog. Argen., t. 18, p. crassidens Amcgh., 1902, Anal. Mus. Nac. Buenos Aires, ser. 3, t. i, p. planum Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. planum Amegh., 1902, Anal. Mus. Nac. B. A., ser. 3,, p. trilophodon Amegh., 1902, Anal. Mus. Nac. B, A., ser. 3, t, i, p. pluteum Amegh., 1901, Bol. Acad. Nac. Cienc. Cordoba, t. 16, p. pluteum Amegh., 1902, Anal. Mus. Nac. Buenos Aires, ser. 3, t. i, p. 29. The species varies in size and in the proportionatedevelopment of the tushes as would be expected in a large 176 THE DESEADO FORMATION OF PATAGONIA. Fig. III. Top of the skull—1/5 natural size; Mate to in i on theleft side is represented by an alveolus but the tooth had fallen outbefore tlie <leath of the animal; , ear chamber; B, brain case; V,vacuities in the bone. PYROTHERIUM SORONDOI 177


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