Abnormal Thickness of Skull. 423 



6. 545. Great Irregularity in the Thickness of the Skull. 



— Skull-cap — macerated and trefined, illustrating the above. 



The specimen is very irregular in thickness, the irregu- 

 larity being especially noticeable on the inner aspect. Near the 

 longitudinal sinus there are several deep depressions resem- 

 bling those produced by Paccionian bodies. On each side, 

 a little behind the coronal suture, there is an elevation, due 

 partly to thickening and partly to depression on the outer 

 aspect. There is a small exostosis on the inside of the frontal 

 bone near the front. B. C. i. 2. M. 49. 



6. 546. Abnormally thin Skull-cap. — Skull-cap — macerated, 



illustrating the above. 



The whole bone is remarkably thin. The digital impres- 

 sions are well marked, especially on the inside of the frontal and 

 lower part of the parietal bones. On the outer surface near 

 the junction of the sagittal and coronal sutures there are two 

 elongated areas where the surface is remarkably porous. 



B. C. I. 3. M. 44. 



6. 547. Deep Depression over the Sagittal Suture,— 



Skull-cap — macerated, illustrating the above. 



The coronal and sagittal sutures are nearly obliterated, 

 but a sulcus marks their position. This sulcus, which is deep 

 on the sides of the coronal suture, is remarkably so at the vertex, 

 where the bone is reduced to a thin shell, and is perforated at 

 one spot. The bone is also thin, and transmits light in several 

 other places, especially near the parietal eminences, and at 

 the junction of the coronal and sagittal sutures. 



B. C. I. 3. M. 42. 



For Inflammatory Affections of the Skull, sec 6. 86 ; 6. 200 and 

 201 ; and 6. 237 to 281. For New Groicth, sec 6. 400. 



