'20 



PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



passing superior to the lower half of that muscle, the other being in- 

 ferior. On the left side there is no abnormality. 



(Signature of observer) ROBERT RICHARDS. 



Date of observation, November, 1906. 

 Sex, Male. 



Measurement of frontal sinuses. 



Maximum depth (antero-post) 

 Minimum depth (antero-post) 

 Maximum width 

 Approximate height - 



Right sinus. 

 14 mm. 

 11 mm. 

 30-2 mm. 

 29 mm. 



Left sinus. 

 13 mm. 

 10 mm. 

 30-2 mm. 

 28 mm. 



The superciliary ridges are well developed and the ethmoidal cells 

 are large. The frontal sinuses lead by a large opening into the middle 

 meatus. 



(Signature of observer) D. H. W. WILLIAMSON. 



