EDENTATA OF THE SANTA CRUZ BEDS. 303 



process which abuts against the unciform. Metacarpal IV is much more 

 slender than II or III and somewhat shorter, a marked difference from 

 Hapalops ; V also is much shorter than in the latter and a little stouter 

 in proportion. 



The phalanges of the first and second rows differ very little from those 

 in the last named genus, but the unguals are broader at the proximal end, 

 less compressed and not so sharply pointed ; in order of size the arrange- 

 ment would be, III, II, IV, I, V. ' 



Associated with the skull, No. 15,524, was found the proximal half of a 

 femur (Plate LIII, fig. i), so unlike that of the other Santa Cruz Gravi- 

 grada as to raise a suspicion that the association was accidental. How- 

 ever, the femur of Analcimorphus serves to connect that referred to 

 Schismotherium with the usual gravigrade type. 



The head is hemispherical, set upon a distinct neck, rising far above 

 the great trochanter and presenting proximally more than internally ; its 

 surface is smooth, without sulcus for the round ligament ;. the great tro- 

 chanter is low and massive and, on the posterior side, it forms a broad, 

 elongate ridge, enclosing a very small digital fossa ; the second trochanter 

 is a prominent, heavy and rugose tubercle, and the third is also very 

 prominent. Aside from the shape and position of the head and the 

 absence of the pit for the round ligament, the great peculiarity of this 

 femur is in the form of the shaft, which is not antero-posteriorly com- 

 pressed and flattened, as it so universally is among the Gravigrada, but 

 tends to the cylindrical shape common to most mammals. 



MEASUREMENTS. 



Humerus, length 138 Metacarpal II, length 021 



" width of proximal end 037 " " width of proximal end .0105 



" " " distal end over epi- " " " " distal end... .009 



condyles 066 Metacarpal III, length 021 



" " distal trochlea ... .029 " " width of proximal end .017 



Radius, length .120 " " " " distal end. . . .010 



width of proximal end 019 Metacarpal IV, length 020 



" " distal end 021 " " width of proximal end .006 



Carpus, proximo-distal length in " ." " " distal end... .006 



median line 015 Metacarpal V, length 012 



" width 033 " " width of proximal end . . ?.OO5 



Metacarpal I, length oio " " " " distal end 006 



" width of proximal end. . .006 Ungual phalanx, digit I, length 018 



" " distal end 006 " II " 033 



