30 THE VARIETIES OF THE HUMAN SPECIES. 



1st. The corners are acute or obtuse; ^\\^\icz2. pentagonoides 

 acutus and obtiisus : the anterior part of the cranium, that is, the 

 two sides which reunite the parietal to the frontal protuberances, 

 can be longer or shorter than usual ; there will then be a penta- 

 gonoides oblongns or a brachypentago7ioides. 



3d. Rhomboid (rhomb oides). 



The rhomboid al form of the norma verticalis (Fig. 5) can inter- 

 change with the pentagonal form, because the most characteristic 

 difference consists in the suppression of the one side correspond- 

 ing to the frontal width. 



V 

 Fig. 5.— Rhomboides. 



This side is very short in the rhomboidal figure of the cranium 

 when considered in relation to the biparietal width of which the 

 protuberances are very distinct and pointed; so the occipital pro- 

 jection is still more acute on account of the greater convergence 

 of the two posterior sides. In this variety the cranium is smooth 

 in the sagittal line, low in relation to its width and length. 



