THE FOSSIL SLOTH AT BIG BOXE CAVE, TEXX. 



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Fig. io (x y^ ). — The sixth hone found (in Layer 2, depth about i foot). Calcaneum (heel bone) 

 of the extinct sloth Megalonyx. The cartilage (of a bright red toning into yellow in the origi- 

 nal) rests as a thick film, considerably cracked, on the left articular face. Marks of rodent 

 gnawing are shown around the lower circumference. 



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Fig. II (x -/i). — The seventh bone found (in Layer 2, depth about i foot). An 

 astragalus (joint or hinge bone of foot). A layer of cartilage (yellowish red in the 

 original) covers the round face and protrudes in brittle flakes from the hollow. 



