. The Deseado formation of Patagonia . species. The following arethe measurements of the type according to Ameghino. Lower dentition, molar i, lengthLower dentition, molar 2, length 31 mm., width 16 mm., width 21 mm. Parastrapotherium martiale Ameghino: p. martiale Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. siiperablie Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 402. The species seems to have been founded on abundantmaterial, representing an animal of larger size than P. holmbergi, which is dis-tinguished by thegreater width of thecrowns of the incisors,by straight cani
. The Deseado formation of Patagonia . species. The following arethe measurements of the type according to Ameghino. Lower dentition, molar i, lengthLower dentition, molar 2, length 31 mm., width 16 mm., width 21 mm. Parastrapotherium martiale Ameghino: p. martiale Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. siiperablie Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 402. The species seems to have been founded on abundantmaterial, representing an animal of larger size than P. holmbergi, which is dis-tinguished by thegreater width of thecrowns of the incisors,by straight caninesdiverging but little, bya strong cingulum onthe outer side of thelower molars and theinner side of the uppermolars, and by thenarrow symphysis ofthe lower jaws. was distinguished by a difference in the arrange-ment of the roots of upper pm. 4, but as the pattern of thecrown is the same, as is also the size, I feel that this differ-ence is simply an individual variation. The followingmeasurements are given by Ameghino:. Fig. 108. Upper molar i of the left side—natural size,after Ameghino. Upper dentition, length from pm. 3 to m. 3 Upper dentition, premolar 4, length Upper dentition, premolar 4, width Upper dentition, molar 2, length Upper dentition, molar 2, width Lower dentition, length from inc. i to m. 3 240 mm. 82 mm. 83 mm,550 mm. PARASTRAPOTHERIUM 155 Parastrapotherium insuperabile Ameghino p. insuperabile Ainegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 403. This is the largest of all the species, and is distinguishedby the enormous development of the cingulum on theanterior, inner, and pf)sterior sides of the upper molars,the same being uninterrupted and so elevated, that theinternal crests seem to rise out of a basin. The followingmeasunmients are taken from Ameghino: Upper dentition, premolar 4, length 37 mm., width 48 mm. Upper dentition, molar 3, length 100 mm., width 80 mm. Lower dentition, premolar 4, length 43 mm., width 2t, mm. CHA
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