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 7 mm. 



Tibia, diameter of shaft 28 mm. 24 mm. 



diameter at distal end 3 8 mm - 3 6 mm. 



Calcaneum, length 103 mm. 96 mm. 



width 3 6 mm. 35 mm. 



Astragulus, length 4 8 mm. 44 mm. 



width 3 8 mm. 35 mm. 



Metatarsus II, length 114 mm. 105 mm. 



Metatarsus III, length 122 mm. 114 mm. 



Metatarsus IV, length no mm. 101 mm. 



Phalanx I of digit III, length 49 mm - 



Phalanx 2 of digit III, length 27 mm. 



Phalanx 3 of digit III, length 29 mm. 



D cut er other ium 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, 



