. The Deseado formation of Patagonia . ition, length pm. I to m. Lower dentition, molar i, length Lower dentition, molar, width Third metacarpus, greatest length Pelvis, length front to back Femur, greatest length (computed) Femur, diameter of middle of shaft Tibia, greatest length Astragulus, length Astragulus, width Calcaneum, length Metatarsus III, length First phalanx of digit III, length Ungual palanx of digit III, length 99 mm. 55 mm. 31 mm. (>h mm. 6 mm. 4I mm. 82 mm. 53 mm, 32 mm, 61 mm. 3 mm. 28 mm, 83 mm, 93 mm, 9 mm. 90 mm. 14 mm, II mm, 25I mm, 32 mm, 12 mm 9 mm To make the simi
. The Deseado formation of Patagonia . ition, length pm. I to m. Lower dentition, molar i, length Lower dentition, molar, width Third metacarpus, greatest length Pelvis, length front to back Femur, greatest length (computed) Femur, diameter of middle of shaft Tibia, greatest length Astragulus, length Astragulus, width Calcaneum, length Metatarsus III, length First phalanx of digit III, length Ungual palanx of digit III, length 99 mm. 55 mm. 31 mm. (>h mm. 6 mm. 4I mm. 82 mm. 53 mm, 32 mm, 61 mm. 3 mm. 28 mm, 83 mm, 93 mm, 9 mm. 90 mm. 14 mm, II mm, 25I mm, 32 mm, 12 mm 9 mm To make the similarity of Prosotherium with Pachy-rukhos clearer, I have restored Prosotherium, figure 40,from which it will be seen that this genus is also a hoppingform with a plantigrade hind foot and a semidigitigradefront foot. In general it compares very closely with Pachy-rukhos, but the limbs are shorter and the grade of speciali-zation is not (juite as high. It is, however, very evidentlythe ancestor of Pachyrukhos. , PROSOTHERIUM GARZONI 71. 72 THE DESEADO FORMATION OF PATAGONIA Prosotherium triangulidens Ameghino P. triangulidens Amegh., 1897, Bol. Inst. Geog, Argen., t. 18, p. 427, P. robustuni, Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 427. P. quartum Amegh., 1901, Bol. Acad. Nac. Cienc. Cordoba, t. 16, p. 371. This species is similar to P. garzoni except for size, theforms running about 12% largtr, and being heavier this same line the upper and lower molars are relativelywider and heavier. The top of the skull also is have drawn carefully the skull and dentition so that thedetail can be seen from the figures. Beside triangulidens,Ameghino described P. robustum, which, as far as I cansee, differs only in being about 5% larger, which is w^ellwithin individual variation, so I have considered it as asynonym. The same is the case with P. quartum, whichAmeghino distinguishes as being about the size of , and having lower pm. i present. The lattercharact
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