108 Proceedings of Royal Society of Edinburgh. [sess. 
characteristics of the Cro-Magnon type (cephalic index 7 6*26). 
The debris in which these skeletons were discovered contained 
relics comparable to those of the latest phase of the Palaeolithic 
civilisation (U Anthropologie, vol. xiii. pp. 561-583). 
Fig. 18 represents a series of lower jaws illustrating, accord 
ing to the late Paul Broca, the gradual evolution of the human 
chin. M. Broca exhibited the drawing in support of his views at 
the International Congress of Anthropology and Prehistoric 
Archaeology held in Paris in 1867 ( Gomptes Rendus, p. 399). The 
Spy jaw, which of course was then unknown, would take its place 
in the series between Nos. 2 and 3. 
