1907-8.] The Inca Bone : Its Homology and Nomenclature. 593 
In the same collection there is also the skull of a Malay who was 
murdered in the Northern Territory by means of a tomahawk. The con- 
dition it exhibits is unusual (fig. 5). Four bones combine to fill up the 
space usually occupied by the membranous portion of the occipital. Three 
sutures running in the sagittal direction divide into four portions what 
would otherwise be the representative of a single inca bone. The central 
suture, however, does not appear to correspond closely in position and 
character with the main sagittal suture of the skull ; and the question arises 
whether after all the “ subdivided inca ” is not really made up of Wormian 
bones, presenting a regular and fairly symmetrical appearance. 
Another skull (No. 35 in the South Australian Museum Collection), 
Fig. 5. 
one of an Australian aboriginal, shows a condition somewhat similar, but 
less in extent and presenting greater irregularity. Another aboriginal skull 
(No. 31 in the Museum Collection) shows two large Wormian bones 
separated by a “tongue” of the occipital (fig. 6). A similar condition 
occurred in the skull of a man here of European descent, twenty-seven 
years old. This skull presented also a persistent frontal suture. My atten- 
tion was directed to it by Professor Watson of the Adelaide University. 
The British skull referred to above, like several other Ancient British 
skulls in the same collection, has a persistent frontal suture. The association 
of such a suture with the existence of an “ interparietal ” has been noted by 
Vogt and others, although in many instances the adventitious bone has not 
been a true inca bone. 
VOL. XXVIII. 
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