A CLINICAL STUDY OP THE SKULL. i)t 



scribed by anthropologists. They may be restricted to the subdi- 

 visions of the sagittal as above proposed. Thus the post-obelial 

 aud the intertuberal parts are often separately and distinctly cari- 

 nated. The bregmal and post-bregmal parts may be carinated, 

 while the rest of the sagitta is normal. The post-obelial, obelial, 

 and the posterior half of the intertuberal parts have been found to 

 be carinated, together with the bregmal and post-bregmal, the ante- 

 rior part of the intertuberal alone remaining normal. The cari- 

 nated portion of the sagitta may extend the entire length of the 

 suture, excepting only the post-obelial. This arrangement is ad. 

 mirably seen in the figures of a woman's skull in Welcker's mono- 

 graph (infra, xiii, Figs. 1, 2, 3, 4). 



The ridge which conforms to the temporal ridge is relatively in- 

 frequent. It is found in heavy male skulls as far as ray observa- 

 tions go. It should be easily felt in the head of the living subject. 

 The enormous lateral ridges of Uiutatherium are probably develop- 

 ments of the temporal ridges, thus showing the extraordinary influ- 

 ence muscle-traction can exert over bony surfaces. If the exact 

 ■degree of influence of all the muscles having bony attachments 

 <;ould be measured, osteology would be placed upon a philosophical . 

 basis. 



Instead of the sagittal suture at the obelion and the post-obelion 

 being depressed it may remain unchanged. The margins of the 

 pai'ietal bone remain also unchanged, while a ridge-like elevation 

 of bone passes obliquely from the sagitta, at the end of the inter- 

 tuberal portion, backward and outward to the meso-lambdoid 

 eminence. Such conformation is well marked in the skull of 

 a Chinese in the College of Physicians. In a living individual 

 retaining such a peculiarity it is highly probable that a large tri- 

 angular depression could be felt at the posterior part of the vertex. 



THE STUDY OF THE INTERIOR OF THE VERTEX. 



The interior or endo-cranial view of the vertex confirms the pro- 

 posed division of the sagittal suture. The several parts are as dis- 



