CMS 



Figure 14: Inner aspect of the two parietal bones of the type specimen of 

 Homo habilis (Olduvai hominid 7). Their measurements show that they 

 are bigger than those of any australopithecine parietal bones yet dis- 

 covered. 



the new specimens, they were loosely spoken of as pre-Zinjanthropus. This 

 term was used only in the sense that the type specimen came from a slightly 

 lower level in the deposit; it was never intended that the specimen be 

 regarded as a form ancestral to Old. Horn. 5, although some people did 

 interpret this rather unfortunate nickname in that way. Later it was 

 formally named Homo habilis, and its catalogue number is Old. Horn. 7. 



Leakey (1961) pointed out that the parietals of Old. Horn. 7 were 

 larger than those of the robust australopithecine of Olduvai; indeed they 

 were patently larger than the parietal bones of any australopithecine yet 

 discovered (Tobias 1966a). Thus, the sagittal arc from bregma to lambda 

 measures 105 mm., whereas those of 5 australopithecines range from 74.5 

 to 91.5 mm. The squamosal arc from pterion to asterion is 69.0 mm. in 

 H. habilis (type specimen) but ranges from 55.5 to 62.5 mm. in austra- 

 lopithecine crania. The coronal edge, although not perfectly preserved, 



61 K 



