196 PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



which showed a horizontal fissure in the left parietal bone. The 

 suture lines and fontanelles were depressed below the level of the 

 surface of the bone (Plate XI., Fig. 4), and the sutures, especially 

 the sagittal, were widely open. 



The measurements of the coronal arc, from the root of the 

 zygoma to the middle of the sagittal suture, were the following : 



Left. Right. 



Sagittal suture - 1 mm. 1 mm. 



Superior parietal bone 47*5 mm. J t Undivided 



+ intraparietal suture = 0-5 mm. | 97'5 mm. 89 mm. -j parietal 



Inferior parietal bone 50 mm. ) ( bone. 



Squamo-parietal suture - 2 mm. 6 mm. 



Squama of temporal bone 18 mm. 21 mm. 



118-5 mm. 117 mm. 



The two parietal bones of the left side thus measure together 97 

 mm., as compared with the 89 mm. of the right bone, and there is a 

 compensatory increase in the right squamo-parietal suture, and the 

 squamous portion of the right temporal bone. 



The second case was in the skull of a hydrocephalic child, who 

 died, aged 7 years. There was a bipartite parietal on the right 

 side, and marked asymmetry. The right coronal arc, from the middle 

 of the sagittal suture to the lower border of the divided parietal, 

 measured 280 mm. (upper segment, 105 mm. ; lower segment, 175 

 mm.) ; the left coronal arc measured 205 mm., there thus being a 

 difference of 7 - 5 cm. between the vertical diameters of the two 

 parietal bones. The metopic suture was closed, and the skull trigono- 

 cephalic in form. 



The third case which I shall mention has been described by Dr. 

 Barclay Smith, and is in the Anatomical Museum, Cambridge. In 

 this specimen a suture runs diagonally from the postero-superior angle 

 of the parietal bone to the antero-inferior angle. Now, on comparing 

 the diameter of the divided parietal at right angles to the line of the 

 suture with the corresponding diameter of the parietal bone of the 

 opposite side, I found the diameter from the postero-inferior angle to 

 the postero-superior angle of the left parietal bone measured 188 



