EDENTATA OF THE SANTA CRUZ BEDS. 317 



the inner side of the distal end is more massive than in the other genera. 

 The astragalar surface is remarkably flat, and though the intercondylar 

 tongue appears on the dorsal border, it is not continued backward as a 

 ridge, and the facet for the inner condyle of the astragalus is very much 



less concave than usual. 



MEASUREMENTS. 



Femur, proximal width 044 Tibia, proximal thickness 040 



" distal width 054 " least width of shaft 017 



Tibia, length 114 " distal width 0395 



" proximal width 05 1 " " thickness 023 



Of the pes (Plate LIII, fig. 7), this individual lacks all the tarsus, 

 except the cuboid, and the first digit. The cuboid is quite peculiar and 

 has a very different appearance from that of Hapalops ; it is relatively 

 long and narrow and has an oblique position in the tarsus ; the calcaneal 

 facet is large and convex and almost lateral in position, and the astragalar 

 facet, which is smaller than in Hapalops, meets the former at an acute 

 angle ; on the tibial side distally and almost confined to the dorsal border, 

 is a small oblique facet for metatarsal III ; the distal end is occupied 

 chiefly by the large, saddle-shaped surface for the fourth metatarsal, that 

 for the fifth being very much smaller and placed at the postero-external 

 angle. 



The metatarsus most resembles that of Analcimorphus and, presum- 

 ably, that of Schismotherium also, but with certain well defined character- 

 istics of its own. 



Metatarsal II is short and massive and, though somewhat narrower in 

 proportion to its length, is otherwise so similar to that of Hapalops as to 

 require no particular description. 



Metatarsal III is somewhat shorter and heavier than II, but is not so 

 extremely shortened as in the genus last named, and the facet for the 

 ectocuneiform has no such deep median notch ; the proximal end is very 

 broad, extensively overlapping the head of IV and articulating by a con- 

 siderable facet with the cuboid, an articulation which has not been ob- 

 served in any other Santa Cruz genus of the order. The shaft is very 

 short, broad and thick, somewhat contracted in the middle and broaden- 

 ing slightly at the distal end, and the distal trochlea has an immense 

 carina. It is worthy of notice that the two sesamoids, which are attached 

 to the plantar side of the distal trochlea, are of very different sizes, that 



