FROM THE NEW HEBRIDES. CAMERON. 419 



the Piltdown skull. It is evident then that the length of 

 the glabella-bregma chord exhibits no very striking points 

 of significance, as it is apparently a fairly constant factor 

 both in fossil and in modern hominidse. It is a very dif- 

 ferent story, however, with regard to the maximum distance 

 between it and the frontal cranial arc. This was calculated 

 to be 13.5 mm. (at a point about midway between the 

 glabella and the bregma) in No. 1 skull, and 14 mm. (at 

 a point about two thirds of the way from the glabella to 

 the bregma) in No. 2 skull, distances which compared in 

 the most striking degree with 25 mm., which the writer 

 found in the case of a Canadian skull taken at random( this, 

 it may be mentioned, is a medium figure for the skulls of 

 white races). Figure 6 has been designed to demonstrate 

 the fact that the evolution of the frontal cranial arc is due 

 in least degree to the elongation of the glabella-bregma 

 chord, and in very marked degree to the expansion of the 

 Bregmatic angle and the increase in the curvature of the 

 frontal cranial arc. It may be mentioned that the writer 

 calculated the maximum distance of the frontal cranial 

 arc from the glabella-bregma chord to be 25 mm. in Smith 

 Woodward's reconstruction of the Piltdown skull, which 

 was thus nearly twice that in these two Melanesian specimens. 

 In fact the latter were to be intimately compared to such 

 lowly evolved skulls as those of the Spy-Neanderthal race 

 where the above average distance was found to be 14.3 mm.^*^^ 



The Bregma-lamhda Chord and the Parietal Arc. — The 

 bregma-lambda chord was 12.1 cm. in length in No. 1 skull 

 and 12.35 cm. in No. 2, measurements which are both 

 slightly higher than the average for one hundred aboriginal 

 Australian skulls, which was found by Berry and Robertson^'*^) 

 to be 11.46 cm., and likewise higher than the average for 

 forty-eight aboriginal Tasmanian skulls which was calculated 

 by the same two observers ■^'^Ho be 11.3 cm. The maximum 

 distance of the chord from the parietal arc was 30 mm. in 



Pro:. <k Trs.ns. N. S. Inst. Sci.. Vol. XIV. Trvns. 27. 



