| Measurements, | Specimen | No. 3287 | No. 3275 | |
|---|---|---|---|---|
| Femur, | length | 289 mm. | ||
| diameter across gr. trochanter | 80 mm. | |||
| diameter of middle of shaft | 32 mm. | |||
| diameter of distal end | 70 mm. | |||
| Tibia, | diameter of shaft | 28 mm., | 24 mm. | |
| diameter at distal end | 38 mm., | 36 mm. | ||
| Calcaneum, | length | 103 mm., | 96 mm. | |
| width | 36 mm., | 35 mm. | ||
| Astragulus, | length | 48 mm., | 44 mm. | |
| width | 38 mm., | 35 mm. | ||
| Metatarsus II, length | 114 mm., | 105 mm. | ||
| Metatarsus III, length | 122 mm., | 114 mm. | ||
| Metatarsus IV, length | 110 mm., | 101 mm. | ||
| Phalanx 1 of digit III, length | 49 mm. | |||
| Phalanx 2 of digit III, length | 27 mm. | |||
| Phalanx 3 of digit III, length | 29 mm. | |||
Deuterotherium Ameghino
Deuterotherium Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 633.
Deuterotherium Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 452.
This genus was first founded on a clacaneum and a bit of the mandibular symphysis, to which were added, later, both the upper and lower premolar and molar teeth. As far as it is known, it is distinguished by the upper molars lacking the metaconule entirely, and being approximately like those of Thaotherium. The dental formula is given by Ameghino as
- 1 0 4 3
- ———,
- 2 0 4 3
the same as Thaotherium. But one 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 Ameghino’s figure of them. The species is distinguished by its size primarily. The following are the chief measurements given.
