BY W. L. CROWTHER, D.S.O., M.B.. AND C. LORD. 171 



Interval bstween internal margins of 



3rd molars 35.5 mm. 



Interval between internal margin^ of 



1st premolars 28 mm. 



Maximum length of skull 178 mm. (Approx.) 



Maximum height of skull 128 mm. (Approx.) 



Maximum breadth of skull (Impossible to measure with 

 accuracy, owing to disintegration.) 



EAGLEHAWK NECK SKULL. 

 (Tasmanian Museum, No. A. (E.H.) 558.) 



This cranium consists of the greater part of the Frontal, 

 right and left Parietal, and Occipital bones. Two small 

 portions of the temporal articulations have been recovered 

 and replaced in their correct positions. The calvarium itself 

 is in very fair preservation. In several places the outer 

 table is wanting. 



Inferior to the right temporal ridge; immediately above 

 the glabella; and in the sagittal suture 55 mm. posterior to 

 the bregma, are cavities throughout the whole thickness 

 of the bone. The loss of bone above the glabella enables 

 the conformation of the frontal sinus to be made out. and 

 shows this to consist of three large and several smaller air 

 cells, the largest of these being over 20 mm. in length by 

 14 mm. in breadth. This central space is connected directly 

 with the large cell of the right side, but not apparently with 

 that of the left. The disintegration of the orbital and nasal 

 portions of the bone allows only parts of six air spaces to 

 be identified. 



It appears that in this cranium the great development 

 of the glabella is associated with and is proportional to the 

 marked development of the air cells of the frontal sinus. 



The frontal eminences are not marked, and no remains 

 of the frontal suture are to be made out, nor any flattening 

 immediately behind the glabella. The superciliary ridges, 

 like the glabella, are well marked. The supra-orbital notches 

 are represented by two shallow grooves 5 and 7 millimetres 

 broad, on the right and left sides respectively. 



Passing backward in the median line, and 45 mm. an- 

 terior to the lambda, is a large parietal foramen, 1 mm. 

 to the right side of the sagittal suture. The thickness ^f 

 the va-Jit is 4 mm. The cerebral fossae are deep and circular 

 rather than ovoid in shape. 



The feature of greatest interest in the skull is its 

 remarkable resemblance, in point of general configuration 



