HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 375 
form from Pikermi. The facet for Mt. III situated near the dorsal angle is quite 
large, while the one on the plantar face is apparently obsolescent as in Macrotherium 
and is thus unlike the well formed facets located on the lower side in Moropus and 
Schizotherium. 
MEASUREMENTS OF FourtH METATARSAL.” 
No. 1706a No. 1701 
(M. elatus), (M. petersoni), 
mm. mm. 
TET Ot Laveen OR Ree eT NE Tee rr ee oe agian a ens nuratean CP cuisy 0S Grayvee aes 157 123 
Amfero-postenlomaiametenot@head mre wl ae ec Nene Cnn eden ce hls oe ne 48 35 
PPPANSVETSeVaTamMeveriOn Mead avis cscs ae elo cics ower was aie sels cases ae nee dee 57 35 
sbransverse qlamerer om cdistaluendin sera sieiaie ci ania a emieicinicis oa secine sae 49 34 
Antero-posterior diameter of distal end. ..........-.--:e sees ect e cece cette eees 53 38 
The Sesamoids of the Pes.—-The sesamoids of the hind feet are similar to those 
of the fore feet, and one of them is shown in the accompanying figure (Fig. 107). 
The Phalanges (Figs. 108-115).—The uniformity in size of the metatarsals 
is also carried out in the phalanges. The latter are more uniform in size than 
SSIES 
Fie. 107. Sesamoid of Mt. IV, right Fie. 108. Proximal phalanx Fre. 109. Weedon pha- 
pes of M. elatus (No. 1706A). X34. 1, of digit II, right pes of M. elatus lanx of digit II, right pes 
articular surface; 2, tibial side; 3, poste- (No. 1706A). 4. 1, superior of M.elatus (No.1706A). 
rior view; 4, fibular side. view; 2, lateral view. x4. 1, dorsal view; 2, 
lateral view. 
in the manus. Furthermore, the proximal phalanges of the pes have less expanded 
proximal ends, but the structure in detail is otherwise similar to that in the manus. 
The median and ungual phalanges are also similar in detail in the fore and hind 
Fig. 110. Ungual phalanx of Fie. 111. Codssified proximal and Fie.112. Proximal pha- 
digit II, right pes of M. elatus median phalanges of digit II of right lanx of digit III of right 
(No. 1706A). X. 1, lateral pes of M. elatus (No. 1706A). +2. pesof M.elatus(No.1706A). 
view; 2, anterior view. 1, fibular, 2, dorsal, 3, tibial, views. <4. 1, anterior view; 2, 
tibial view. 
7 Italicized numbers represent estimated measurements. 
