NOTODIAPHORUS CRASSUS 39 
Proximally it articulates entirely on the cuboid; distally 
it has a trochlea similar to that of Mt. II, the carina extend- 
ing onto the dorsal surface. While Mt. V is lacking, it is 
clearly indicated that a vestige of it should have been 
present, as there is a tiny articular surface for it on the 
cuboid, and a rugose surface on the outside of Mt. IV. 
The phalanges are long and have the articular ends 
swollen somewhat as in camels. The phalanges of the 
first row are nearly equal in size, each with the proximal 
trochlea deeply notched for the carina of the metatarsus; 
and with the distal trochlea simple, though slightly concave 
from side to side, and reflexed well onto the dorsal surface. 
The phalanges of the second row are shorter and simpler, 
and somewhat depressed distally. The ungual phalanges 
are flattened from top to bottom, of moderate size, some- 
what longer than wide, and without any indications of a 
cleft. 
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., 24mm. 
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., IOI 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. 
Deutorotherium 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, 
