CRANIOLOGY OF THE ABORIGINES OF TASMANIA. 395 



and relative size of the frontal, parietal and occipital lobes of the cerebrum. The 

 point at which each radius intersected this plane is its tentorial point, and the 

 segment of the radius which extends from this point to the vault is its tentorial seg- 

 ment. The tentorial segment of the basi-perpendicular radius, from the basion to a 

 point on the cranial vault behind the bregma, drawn at right angles to the plane of 

 the foramen magnum, has a general relation to the fissure of Rolando, in front of 

 which is the frontal lobe : between the tentorio-perpendicular and tentorio-lambdal 

 radii are the parietal and the upper end of the temporal lobe : behind the tentorio- 

 lambdal radius is the occipital lobe. 



In this memoir, instead of making sections of the skulls and reproducing the 

 surface of section, I obtained tracings with Lissauer's apparatus of the cranial vault 

 from the opisthion to the nasion, and by marking the position of the basion I 

 have obtained the radial as well as the other measurements above referred to, and 

 I have indicated by the dotted line the position of the foramen magnum (figs. 

 2, 3, 4, 5, 6, 7, p. 396). 



Klaatsch, in a recent memoir,* has figured some Tasmanian skulls in the London 

 and Paris museums traced with his diagraph. He has taken the glabella as a centre 

 from which to draw lines to the bregma, lambda, occipital point and inion. From the 

 glabella-inion line he has taken the height to the bregma, to the vault behind the bregma 

 and to the lambda, as well as the chord of the arc from the glabella to the bregma. In 

 relation to these radii he has measured the bregma angle and other angles. In addition 

 to the Tasmanian skulls similar measurements of skulls of Australians, Europeans, and 

 other nationalities have been recorded in his tables. 



The glabella, owing to variations in its size and the degree of projection in individuals 

 and in races, exercises an important influence on the character of the physiognomy, and 

 is now almost universally employed as the point in front from which to measure the 

 maximum length of the skull and the head, in the determination of the length - 

 breadth or cephalic index. The range of variation in its projection, associated in a more 

 or less degree with the development of the frontal sinuses, unfits it to be used .for taking 

 the point in front from which to estimate the length of the cerebral part of the cranial 

 cavity. 



As I desire to employ measurements which, as far as is consistent with the difference 

 between a sagittal section and a sagittal contour, will enable a comparison to be made 

 between the skulls now described and those studied in my previous memoirs, I have 

 continued to employ the nasio-tentorial plane, and in Table III. I have stated the radial 

 and other measurements previously adopted. Six of the male Tasmanian skulls were 

 selected for this purpose, and they are designated by numbers corresponding to those 

 specified in Table I. The contour of the vault of these skulls, Nos. 1, 2, 5, 6, 7, 10, t 

 together with the lines of measurement, have been reproduced in Figs. 2, 3, 4, 5, 6, 7. 



* Zeitschrift fur Ethnologie, Heft 6, p. 875, 1903. 



t No. 3 is that of a female, in No. 4 the skull-cap was loose, Nos. 8 and 9 were fragmentary ; they are not figured. 



