CMS 



Figure 16: Anterior view (above) and posterior view (below) of the bi- 

 parietal arch of Olduvai hominid 7 (the type specimen of Homo 

 habilis). In the lower photograph, the artificial part-endocast is shown 

 in position. 



The partial endocast of Olduvai Hominid 7. From the 2 recon- 

 structed biparietal arches, partial biparietal endocasts were next made, 

 each representing that part of the cranial cavity enclosed above and at 

 the sides by the parietal bones (Figure 16). The front, back, and sides 

 of the endocast were set by the borders of the articulated, reconstructed 

 parietal bones. The basal aspect of the endocast was made to follow the 

 concavo-convex contour of the temporal (squamosal) margins of the parietals. 

 Each of the 2 finished products was accepted as representing the volume of 

 the tunnel shaped space enclosed by the parietals (Figure 17). 



The volume of each of the 2 partial endocasts was determined 5 times 

 by water displacement. The endocast based on the first biparietal recon- 



& 6 4 



