Ae MEMOIRS OF THE CARNEGIE MUSEUM. 
feet. A typical feature of the genus is seen in the separated first and second 
phalanges of all the digits. In the extensive material in the Carnegie Museum 
there is, however, occasionally found a codssified first and second phalanx of the 
pes; a character of individual variation or possibly old age (see Fig. 111). 
Fic. 113. Median phalanx of Fic. 114. Ungual phalanx Fic. 115. Ungual phalanx of 
digit III, right pes of MM. elatus of digit III of right pes of M. digit IV of right pes of M. elatus 
(No. 1706A). +4. 1, dorsal elatus (No. 1706A). #4. 1, (No. 1706A). #4. 1, dorsal 
view; 2, lateral view. dorsal view; 2, lateral view: view; 2, lateral view. 
As represented in the cast of the hind foot of Nestoritherium pentelici, the 
three phalanges of the fourth digit are all present. They are proportionally some- 
what shorter and broader than in Moropus, but more closely suggest the latter than 
the same bones in Macrotherium. Judging from the cast, these bones appear to 
be codssified, which is not at all surprising in view of the tendency toward coéssi- 
fication of the phalanges in Moropus from an earlier formation. 
In Macrotherium the proximal phalanges are shorter, much more depressed, 
and broader, and the terminals are larger in proportion than in Moropus. The 
proximal and median phalanges are not codssified; the articulations, however, 
indicate that had we a number of individuals, there would undoubtedly be found 
cases of codssification of these two bones in Macrothervum. 
MEASUREMENTS OF PHALANGES. 
No. 1706a No. 1701 
(M. elatus), (M. petersoni), 
mm. mm, 
hen gthrotsanmirstiphalanxs2 didicit weet eee eer een ane ener 68 50 
Tene thvokdinshramds sec omdap halla aes eapyeas ian yeh geen east eee 83 
Iheng thiol terminal ysphalanx oles ciclo bani eee nner en nee 84 40 
Height of same phalanx. sy hint tna ee oe ee eee ee eer 45 3l 
ARTICULATED SKELETON AND RESTORATION OF Moropus ELATUS MARSH. 
Plates LXXIITI-LXXVII. 
The articulated skeleton of Moropus elatus presents many unique features. 
Perissodactyl characters predominate when the skeleton is viewed as a whole, 
but in detail there are a number of anomalous features, among which the structure 
