supplies the anterior boundary of the lachrymal foramen 

 (margo lacrymalis), at the angle between these two is the 

 socket-like notch with which the prefrontal process of the 

 vomer articulates (incisure romevulis) \ 1. 



The Frontal (O.s front ale) | Fig. 14] is a stout ilat bone 

 of irregularly pentagonal outline. On the inferior surface 

 a longitudinal ridge (crista orbito-sphenoidea) 1 1 1 separates 

 a narrow medial area (scmhulcm olfuctorius) [2] from an 

 expansive orbital surface [3]. With the bones in contact 

 the two olfactory semisulci form the roof of that portion of 

 the cranial cavity which lodges the olfactory peduncles, 

 the orbito-sphenoid cartilages are attached to the ridges 

 of that name. The medial border (mavyo sagittali*) [4] 

 articulates with the other frontal. The bone also presents 

 parietal [5], post frontal [6] and prefrontal [7] margins for 



of an oblong flattened body i 1 1 bearing below a do* awai Uj 



projecting alispheuoid plate |2|. The ventral surface is 

 divided by the base of the alisphenoid plate and the orbito- 

 sphenoid crest [3] into narrow cerebral [4] and a very much 

 more extensive orbito-temporal area. The anterior portion 

 of the cerebral surface is a backward continuation of the 

 olfactory semisulcus on the frontal, and the orbito-sphenoid 

 crest which limits it, is continuous with that of the same 

 bone. The orbito-temporal area is divided into a lachrymal 

 surface in front [5| in contact with the lachrymal gland, and 

 a temporal surface |6 1 behind, by a low rounded ridge which, 

 though at times slightly developed, can always be detected. 

 The body articulates with the other parietal along the 

 sagittal margin [7J. Behind the cerebral surface, which 

 only extends along one half the bone, is an area for articu- 

 lation with the supraoccipital; this supraoccipital surface 



