THE VARIETIES OF THE HUMAN SPECIES. 



37 



7th. BiRSOiD {byrsoides) (Fig. 16). 



The apparent form of this cranial type is an ovoid, which is 

 removed from the usual form, because it has a rather large biparie- 

 tal expansion, which does not terminate at the apex of the ^%%^ 

 but is rounded off; moreover, the curves, which are directed from 

 the larger to the frontal expansion, are concave, with dilatation of 

 the frontal line. Thus this form seems to be that of an elongated 

 purse, the opening of which is found at the bifrontal line and the 

 bottom at the expansion of the parietal curves, whence the name 

 of byrsoides (like a purse). 



Fig. 16.— Byrsoides. 



Observed from the side, the birsoid presents a superior plane; 

 it is low, with the occipital rounding, but protuberant. 



In its norma verticalis I have observed a variation among the 

 birsoids of ancient Egypt, one with a smaller biparietal expansion. 

 The cranium of this variety is large. 



The seven forms which have been described are recognizable 

 by the norma verticalis. The following are those in which the 

 vertical is insufficient, uncertain or can be easily confounded with 

 others wh.ich are different. Among these the following are found: 



