. The Deseado formation of Patagonia . pressed distally. The ungual phalangesare flattened from top to bottom, of moderate size, some-what longer than wide, and without any indications of acleft. Measurements, SpecimenFemur, length No. 3275 diameter across gr. trochanterdiameter of middle of shaftdiameter of distal enrlTibia, diameter of shaft diameter at distal endCalcaneum, lengthwidthAstragnlus, lengthwidthMetatarsus II, lengthMetatarsus III, lengthMetatarsus IV, lengthPhalanx i of digit III, lengthPhalanx 2 of digit III, lengthPhalanx 3 of digit III, length No. 3287 289 mm. 80 mm. 32 mm. 7
. The Deseado formation of Patagonia . pressed distally. The ungual phalangesare flattened from top to bottom, of moderate size, some-what longer than wide, and without any indications of acleft. Measurements, SpecimenFemur, length No. 3275 diameter across gr. trochanterdiameter of middle of shaftdiameter of distal enrlTibia, diameter of shaft diameter at distal endCalcaneum, lengthwidthAstragnlus, lengthwidthMetatarsus II, lengthMetatarsus III, lengthMetatarsus IV, lengthPhalanx i of digit III, lengthPhalanx 2 of digit III, lengthPhalanx 3 of digit III, length No. 3287 289 mm. 80 mm. 32 mm. 70 mm. 28 mm., 24 mm., 36 mm. 103 mm., 96 mm. 36 mm., 35 mm. 48 mm., 44 mm., 35 mm. 114 mm., 105 mm. 122 mm., 114 mm. 110 mm., 101 mm. 49 mm, 29 mm. Deuterotherium Ameghino Deuterotherium Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 452. This genus was first founded on a clacaneum and a bitof tlie mandibular symphysis, to which were atlded, later,. \j^ 40 THE DESEADO FORMATION OF PATAGONIA both the upper and lower premolar and molar teeth. Asfar as it is known, it is distinguished by the upper molarslacking the metaconule entirely, and being approximatelylike those of Thaotherium, The dental formula is givenby Ameghino as ^ ° ^ 3 , the same as Thaotherium. Butone species has been described. Deuterotherium distichum Ameghino We did not find this species, but the teeth assigned to it are very characteristic, and so I reproduce Amegh- inos figure of them. The ..,,.. species is distinguished by Fig. 13. Upper pm. 3-1. 3 of the left side— o j natural size, after Ameghino. J^g gl^e primarily. The fol- lowing are the chief measurements given. Upper dentition, pm. 3 to m. 3, length 50 mm. Lower dentition, inc. 1 to m. 3, length 80 mm. Macrauchenidae ( = Mesorhinidae Amegh.) This family is distinguished, first, by the completedental series in which none of the anterior teeth are devel-oped into t
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