ILLUSTRATIONS 



FIGURES 



i. Map to show the location of Aden Crater 2 



2. Rough vertical section of sloth pit 4 



3. Skull and Jaws, right aspect 7 



4. Skull, dorsal aspect 7 



5. Skull, palatal aspect 7 



PLATES 



I . Location of Sloth 23 



A. View of Aden Crater 



B. Looking west into the crater through the breach in the eastern wall of the rim. 

 The opening into the sloth pit reaches entirely across the floor between the man 

 on the left and the one on the right 



Photografh by Longwell 



C. Opening of sloth pit looking obliquely downward from the south side of the 

 breach. The opening is somewhat foreshortened in the view 



Photografh by Longwell 



II. Skeleton of N othrotherium shastense, left aspect, about 1/9 natural size 25 



III. Skull of N othrotherium shastense 27 



A. Lateral aspect showing portion of hide 



B. Palatal aspect 



C. Mandible 



About 1/3 natural size 



IV. Manus of N othrotherium shastense 29 



A. Right manus, palmar aspect, digit V apparently vestigial, probably premortem 

 injury 



B. Left manus, palmar aspect, missing hallux once present, but removed by a spec- 

 tator 



C. Right manus, inner aspect, hallux claw sheath missing 



D. Left manus, outer aspect 

 About 3/8 natural size 



V. Skiagraph of right manus 3 1 



A. Inner aspect 



B. Palmar aspect 

 3/4 natural size 



