58 Proceedings of the Royal Irish Academy. 



LraiBAE AND Sacral Plexus of Tetrapteryx Stanhyanus. 



X.— The Pkesence oe a Lacheymo-jtjgal SSutuke in a Human Skull, 

 AND ON ITS Comparative Anatomy. By A. Macalister, M. B., 

 Professor of Comparative Anatomy, Dublin University. (With 

 ' Plate 1.) 



[Read November 9th, 1874.] 



The relation of the processus maxillaris of the jugal bone to the 

 supraorbital edge of the maxillary is subject to a considerable amount 

 of variety. In the largest number of ordinary European crania this 

 process ends at a point vertically over the infra-orbital foramen, or 

 over the space between the first and second premolar tooth. The fol- 

 lowing Table shows accurately the relationships of this process, as 

 noted in connexion with collateral points in 204 skulls : — 



