114 



ON THE VERTEBRATE SKULL. 



Perhaps no method of investigating the structure of the 

 skull conduces so much towards the attainment of a clear 

 understanding of this sort of architectural anatomy, as the 

 study of sections, made along planes which have a definite 

 relation to the principal axes of the skull. 



Ficr. 47. 



Fig. 47. — Diagrammatic side view of a Human Skull. — Fr. Frontal. Pa. Parietal. S.O. 

 Supra-occipital. S.O*. Squama occipitis above the torciilar Herophili ami lateral 

 sinuses. As. Alisphenoid. fity. Portio squamosa of the temporal bone. M. Mastoid 

 process and pars mastoidea. Ty. Tympanic. St. Styloid process. Nd. Nasal. /.. 

 Lachrymal. Ju. Jugal, or Malar. Pmx. Premaxilla. Mas. Maxilla. Mn. Mandible. 

 ////. ITvoid. in. Malleus, i. incus. [These letters will bear the same signification 

 throughout the series of figures of crania.] 



