SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 83, PL. 91 



M^*^ 



1. Skull of adult (?) Sinanthropus. side (?) view. 



2. Mesial view of the six normae of the adult Siimiitliropiis jaw fragment, mesial 



view. (After Black.) 



3. The unerupted left permanent canine of Sinaiitliropiis juv. on the fractured 



surface. (After Black.) 



