202 THE GEOLOGIST. 
The considerable development of the frontal sinuses and of the dif- 
ferent ridges and processes of the skull, shows it to be that of an adult, 
and the same characters lead me to believe that it belonged to a male. 
Otherwise it is small enough for a female, as its extreme length does 
not exceed 7*2 in., its extreme breadth 5*4 in., and its horizontal cir- 
cumference 20|- inches. 
The skull has a very peculiar form. If a line drawn from the 
glabella to the saperior curved line of the occiput be made hori- 
zontal, the highest point of the longitudinal median contour of the 
skull will be seen to be situated about the middle of the length of 
the sagittal suture, and from this point the contour shelves rapidly 
downwards, to the brow on the one hand, and to the centre of the 
space between the apex of the lambdoidal suture and the occipital 
protuberance on the other. This last is the most prominent portion 
of the back part of the skull, the median contour below it bending 
forwards to the occipital protuberance, which is a very strong, project- 
ing, triangular process. It follows from this description that a line 
taken from the glabella to the occipital protuberance is shorter 
than one from the glabella to a point midway between this and the 
lambdoidal suture. The difference between the two is about 0-3 of 
an inch. I find that crania differ a good deal in this respect, the 
occipital protuberance being in many, especially the lower races of 
mankind, the most backwardly situated part of the skull, when the 
glabello-occipital line is made horizontal, while in others, as in the 
present instance, the most posterior part of the skull is situated 
much higher up. 
The line of greatest breadth of the skull is situated nearly in the 
same plane as that of its greatest height, in the position indicated, 
and the auditory foramina may also be said, roughly, to be intersected 
by that plane. The forehead is low and narrow, but not retreating. 
The supraciliary prominences are very well developed and, by their 
form, indicate the existence of large frontal sinuses. The space be- 
tween the glabella and the nasal suture is not really very depressed, 
though on the side view of the skull it appears to be so, by reason 
of the projection of the supraorbital prominences. 
The vertical height of the skull from the centre of the auditory 
foramen to the vertex is 4'8 inches, and the centre of the auditory 
foramen lies about O'S of an inch below the level of the glabello-occi- 
pital line. 
The mastoid and styloid processes are well developed. 
