822 



PETER BASSOE 



The mesial portions of the superior orbital fissures are dilated and their 

 lateral margins sharpened. The round and oval foramina are of 

 normal size while the carotid foramina are enlarged in their inner por- 

 tions and the margins sharpened. The grooves for the middle- meningeal 

 arteries on either side are deepened by marginal new bone formation. The 

 posterior fossa shows marked roughening of its entire surface except in the 

 cerebell'ar fossae. The groove for the right lateral and sigmoid sinuses is 

 large, with exostoses about its margins ; the left is small and deep. The 



Fig. i). Floor of cranial cavity showing 

 and sella turcica. (Case of Dean Lewis.) 



roughness of bone, large frontal sinuses 



posterior lacerated foramina are small and on both sides divided by parti- 

 tions formed from marginal and ligamentous ossification. The clivus is 

 extremely irregular with excrescences at the base of the dorsum sellae. 

 The foramen magnum is irregular and reduced in size. The internal 

 auditory canals are somewhat funnel-shaped from within outward and 

 not reduced in si/t-. The external auditory canals are of about normal size 

 but there is a small warty excrescence on the outer wall of the right canal. 

 Facial Hones. The nasal bones are little changed. The orbital open- 

 ings are somewhat reduced from overgrowth at their superior margins, the 

 remainder of the orbital walls being thin. The lacrymal fossae are deep- 

 cried and their margins sharpened. The superior maxillary bones are re- 

 duced in size, with marked thinning of the bony walls, and deepening of 





