592 Proceedings of the Royal Society of Edinburgh. 
I think there can be no doubt about the homology in the examples illus- 
trated in figs. 1 and 3, and in the skull from Torres Strait. The bone in 
each case is the portion of the occipital that develops in membrane — the 
inca bone of Tschudi. This bone in the human skull was said by him and 
is said by most others to correspond with or represent the “ interparietal ” 
(Parker and Bettany, Claus, etc.). One wishes, however, for details of the 
evidence, embryological or other, on which the statement is based. 
By a strange coincidence I received, about the same time, another New 
Caledonian kanaka skull from Captain Perny of the Messageries Maritimes 
Company. In it Wormian bones abound. It presents also a very striking 
Fig. 4. 
feature in the occipital region. Behind the left limb of the lambdoid suture* 
there is interpolated a large bone which one might properly describe as a 
huge Wormian bone (fig. 4). Curiously enough, the lower margin resembles 
closely in position and appearance the corresponding suture in the other 
kanaka skull (fig. 3). Had the inner margin of this bone coincided 
with the median line of the skull, one would probably have classed the bone 
as the left half of an inca bone. 
In the South Australian Museum there is an Ancient British skull from 
a round barrow presenting a condition very similar to this, but the bone is 
not so large. The adventitious bone in this case is no doubt a Wormian 
bone. 
