When we eliminate all the cases that show any trace of artificial
flattening of the back of the skull, there remain only a few specimens
for observation. Among these, three-fourths show medium convexity
of the occiput, while in one-fourth the region is protruding. There
is no difference in this respect in the two sexes. The external
occipital protuberance and the occipital ridges do not show especially
strong development in any case, and barring a single instance of
the occurrence of an Inca bone, which will be spoken of in another
connection, there are no anomalies of this region to be recorded.