1913] 



Stock: Nothrotherium and Megalonyx 



353 



distinctly the wider. On the dorsal surface of the tuberous apex 

 of the internal condyle is a short closed canal, which is not 

 present in M. jeffersonii, Hapalops, or Mylodon. 



Fig. 12. Megalonyx calif ornicus, n. sp. Left humerus, no. 21003, ap- 

 proximately one-fourth natural size (i.e., X .27). Eancho La Brea Beds. 



In the third left digit (l), no. 20002 (figs. 13 and 14) the 

 lateral faces of the proximal end of the first phalanx for meta- 

 carpal articulation are curved dorso-ventrally, and the concave 

 median face narrows below. The outer offset is more abrupt than 

 the inner one. The outer face has a greater width, but the base 



