Cope.] 82 
[April 7, 
front, and much deeper superior ligamentous pit. Of the scaphoids, two 
probably of the same animal, are deeper posteriorly, and with the convex 
part of the superior articular face rounded ; four others are flatter, two 
with the articular face above rounded, and two subconical. The cuboids 
differ in the degrees of depression of form. ‘Two are more depressed, 
three larger less so, and one still less. 
The metacarpals are all present, and belong to several animals. There 
are four of the first, which appear to have belonged to two species. 
Three exhibit the articular extremity as very oblique to the superior 
plane of the bone, and including a groove between it and the surface of 
attachment to the 2d metacarpal. The inferior surface exhibits a 
swollen knob, and a pit behind it. The fourth is nearly plane above and 
below, with the articular ginglymus at right angles to both, and articula- 
tion to second metatarsal also at right angles to them. No groove be- 
tween these surfaces, but a regular concavity. Outer extremity not pro- 
Jecting as in the first. The other metatarsals have the form and propor- 
tions already described by Leidy. 
M. 
Pength ot Metdtarsis Iii Gis ei eae esa! 045, 
Width & ORUCTIOUNINA © LON cd eb ets ae) sei ee 036 
Length...‘ Ms Ney eee Ni nae 059 
Depth i ie Obes Gian atti Orit Gaon eee OMe 052 
lieneth  . ‘ Ti, og nls ee ete a aod % 0945 
Depth Nhek Wibere ann Sie ers neledgn se eres 057 
ibength =“ AVG FU See bee ee eres. 104 
Depth te {Ce SEDER oes ae ieee tS 05 
The phalanges are like those figured and described as belonging to the 
M. jeffersonti. Many of them are the proximal ones of greatly shortened 
proportions, characteristic of the sloths. The penultimate are of various 
sizes, an average one measures as follows: 
Ni 
WECM a Seve seca ceed ee Ae ee ieee 0.071 
WCU DOMIN rice loeb iets et ee 045 
VIO OS air sa enc. So va ce a 037 
But the following measurements of a proximal phalange indicate an 
immensely large example. 
M. 
ARCO TM vl wm Mahene Gee se Fares koe ee ee sal yess” 0.081 
US PE OCMC vey acs on ieee G ls ene i a 062 
ROU eee Piste nus ee Weer css os Hier el sases ieee oa 058 
The wngucal phalanges are compressed and curved, with obtuse rounded 
superior margin. Only one exhibits a tendency to the acute superior 
margin characteristic of those typical of M. jeffersonii, though claws of 
both kinds have been ascribed to the latter. The inferior plane is 
gently convex. The insertion for flexor tendon is expanded laterally 
