158 



Mr Shrubsall, Crania from Teneriffe. [May 11, 



Classifying by this index according to Brocas divisions, we 

 obtain the following table : 



In the great majority of crania from Teneriffe the frontal 

 region is well developed, the forehead being full, rounded and 

 decidedly broad, although in some which constitute a distinct 

 type by themselves it is low and receding. 



The glabella is only moderately prominent, but the superciliary 

 ridges are well developed even in the female, the subcerebral 

 curve contributing on the average in the male 23'9 per cent, 

 and in the female 17'2 per cent, of the total frontal curve. 



The frontal eminences are usually prominent but do not reach 

 to the level of the mid-sagittal line. 



The sagittal curve in most typical cases runs uniformly back 

 to the lambda, but in some crania the annular post coronal 

 depression of the middle third of the parietal bone described by 

 M. Vernau is to be seen. This depression, which somewhat 

 resembles that produced by a bandage tied tightly round the 

 head during early youth, is. according to that author, not an 

 artificial deformity but a natural variation in the sagittal curve. 

 After passing the lambda this curve often shews a distinct flatten- 

 ing over the upper part of the occipital bone, and when this is 

 present there is a decided fulness of the whole occipital region, 

 the projection backwards taking place immediately at the parieto- 

 occipital suture. From the inion the curve passes sharply down- 

 wards and forwards to the opisthion, the bone in this region being- 

 flattened and strongly marked by muscular impressions. In 

 many cases the conceptaculse cerebelli are so far developed that 

 the skull rests posteriorly upon them rather than upon the mastoid 

 processes or the occipital condyles. The inferior portion of the 

 occipital bone is horizontal. The relationships in point of size 

 of the various portions of the curve are shewn in the following 

 table, in which they are compared with the length of the total 

 sagittal curve (= 100) : 



