HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 371 
has not yet been found a bone which can positively be recognized as an ento- 
cuneiform, but, judging from the fact that the navicular of many individuals shows 
no articular surface for the entocuneiform, and also that Mt. II seldom shows 
any indication of a contact with this element, it is very evident that the bone was 
only a small sesamoid, or was entirely wanting. In Homoropus from the Washakie 
Kocene the entocuneiform is present but has no facet for Mt. I. 
In the material representing Macrotherium grande at our command there are 
no cuneiforms. In Nestoritherium on the other hand the ecto- and mesocuneiforms 
are represented. Inthe casts used these bones adhere to Mt. III and IV respectively. 
In proportions and details these two bones are remarkably similar to the same 
elements in the American genus Moropus. | 
MEASUREMENTS OF MESOCUNEIFORM. 
No. 1706a No. 1701 
(M. elatus), (M. petersoni), 
mm. mm. 
FAMLCFO-POStEM OT; AIAIMe terse ede ory ince ae SEES ene Sheets Sa Sug edeasdlelas aoe glele 40 38 
MT ANSV.ETSCLCIAIM CLOT arm pte eee anit Sealey ute i cy ate Cot Lh NY Sig aed tee 23 22 
Werticalkdiam eters rier rasta ser cee cue ute ny cinch aetna oe eu etes  ane 20 14 
Metatarsal II (Fig. 104).—The proximal end of the second metatarsal is very 
little expanded especially in the lateral directions. The actual length of the 
bone is very little less than that of Mt. III, but in the tarsus it appears quite short 
on account of the elevation of its head above that of the latter (Pl. LX XII). 
The head has four articular surfaces. One di- 
rectly superior for the entocuneiform and the 
other three on the fibular side articulating with 
the ectocuneiform and Mt. III. The first is 
concave antero-posteriorly, slightly concave lat- 
erally, and corresponds with the evenly convex 
distal surface of the mesocuneiform. The lat- 
eral facets are of an interlocking nature and 
below the articulations there isa rugose eminence Sy wy 
for cartilaginous attachment which takes up Fic. 104. Mt. II of right foot 
the entire fibular face of the bone (see Fig. 104, “/atus (No. 17064). X3. 1, fibular side; 
1). The dorsal and tibial faces are quite rugose, Oita aes 
while plantarly there is a protuberance which extends across the entire plantar 
face of the head. The shaft is rather short and heavy; it is cylindrical, but with a 
rugose ridge extending from the plantar tibial angle of the head to the middle 
region of the shaft, well illustrated in Fig. 104, 3. Distally the bone is more 
expanded than proximally, with the anterior portion of the trochlea hemispherical 
