HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 369 
the navicular and the inferior with the ectocuneiform.” Distally there is one large 
facet, subtriangular in outline, slightly convex antero-posteriorly and concave 
laterally. On the plantar face there is an unusually heavy tuberosity for muscular 
attachment. (See Fig. 101, 2, 3, 5, and 6.) 
In Nestoritheriwm the cuboid is actually and proportionally lower, the proximal 
articulation less concave antero-posteriorly, the distal articulation more unevenly 
convex and concave, the navicular 
articulation deeper vertically and 
shorter antero-posteriorly than in 
Moropus. With the exception of 
the above noted differences the 
cuboid in the Greek and American 
forms is very similar, especially © 
agreeing in the fact that in both 
genera the bone does not touch 
the astragalus. 
Fie. 101.- Cuboid of the right foot of M. elatus (No. 
1706A). X#. 1, anterior view; 2, tibial surface; 3, fibular 
surface; 4, superior view; 5, posterior view; 6, inferior view. 
In Macrotherium the cuboid is 
entirely different from that in Mo- 
ropus. In the first place it partly 
supports the astragalus which it does not in the other genus; secondly, its fibular 
angle is very low, while it is quite high in the American form, and thirdly, the 
plantar process is extremely small, while in the tibial direction the bone is modified, 
forming a long heavy arm, which supports the lesser process of the caleaneum, a fea- 
ture entirely unknown in Moropus. 
MEASUREMENTS OF CUBOID. 
No. 3081 Y.M. No. 1706a No. 1701 
(M. distans, type), (WM. elatus), (M. petersoni), 
mm. mm. mm. 
IAMILEKO=POStErIOLCiaMeverani en aati eae cease odeeee 45 85 49 
diiransverse diame tense enki sete is seek ae tener e ny Fonte ae ea cote 31 55 37 
Werticaliciamieberssaynt wir sack ty arty etme ant leeros eke fo ea 25 37 25 
Ectocuneiform (Fig. 102) —The ectocuneiform is sub-triangular in general out- 
line, low, and broad; its transverse diameter being proportionally greater than 
in Titanotherium. The bone is especially prominent in the tarsus, due to its 
broad dorsal surface. Proximally the facet for the navicular is concave antero- 
11 These facets vary in different individuals, sometimes there is an additional facet for the navicular on 
the proximal angle near the dorsal face, and the facet for the ectocuneiform is sometimes divided into two 
portions, an anterior and a posterior, 
