is the crown totally unworn but the roots are not in an advanced state of 

 formation, being very much more incomplete than in A. boisei (Old. 

 Horn. 5). Thus, on dental grounds, Old. Horn. 16 is of younger individual 

 age than Old. Horn. 5 and should perhaps be equated in age with the 

 H. habilis paratype, Old. Horn. 13. 



The calvaria has been reconstructed from no fewer than 107 fragments. 

 The first reconstruction by Dr. M. D. Leakey and a modified version of it 

 made by I.. Distiller and myself on casts of the fragments were both incor- 

 rect in that an elongate fragment of bone had been placed in the left tem- 

 poral fossa. As this fragment was orientated with its long axis (52.5 mm. in 

 length) anteroposterior, it had the effect of greatly elongating the recon- 

 structed cranium. At this stage, the reconstructed cranium had an esti- 

 mated maximum glabello-occipital length of 159 to 160 mm. Furthermore, 

 the long, ovoid appearance of the vault, as seen in norma verticalis, was 

 strongly reminiscent of some of the Asian specimens of H. erectus (cf. 

 Leakey 1966). 



In January 1965, when I had the opportunity of reexamining the origi- 

 nal fragments in Nairobi, I noticed a clear, beveled sutural edge on the 



_i_ 



CMS 



Figure 21: Norma lateralis of Olduvai hominid 16 (provisionally referred 

 to Homo habilis by Leakey, Tobias, and Napier). The estimated cranial 

 capacity is 620 c.c, corresponding to an "adult value" of 633 c.c. 



^ 76 



