96 



C. W. M. Poynter 



EXPLANATION OF PLATES. 



These figures are semidiagramatic in that they represent the actual con- 

 ditions of the brains rather than the way they appear. Photographs were 

 made of the brains and tracings made on these as the brains were studied; 

 finally drawings were made from the brains and corrected from the re- 

 traced photographs. I am indebted to Miss Warner, the department artist, 

 for the excellence of the final results. 



Figures i to 6 belong to Case L and figures 7 to 12 to Case IL On 

 account of the full description in the text and the similarity of the hemi- 

 spheres on the two sides I have not considered it necessary to employ 

 identification marks for all of the figures. 



ABBREVIATIONS USED IN FIGURES 



Lateral Surface 



Fissura Sylvii — main stem, fsy. 



Fissura Sylvii — ramus posterior as- 

 cendens, rpa. 



Fissura Sylvii — ramus posterior de- 

 scendens, rdp. 



Fissura Sylvii — ramus anterior as- 

 cendens, ra. 



Fissura Sylvii — ramus anterior hor- 

 izontalis, rh. 



Sulcus centralis, c. 



Sulcus praecentralis superior, prs. 



Sulcus praecentralis inferior, pri. 



Sulcus praecentralis inferior — ra- 

 mus horizontalis, h. 



Sulcus frontalis superior, fs. 



Sulcus frontalis medius, fm. 



Sulcus frontalis inferior, fi. 



Sulcus frontomarginalis, fma. 



Sulcus radiatus, r. 



Sulcus diagonalis, d. 



Sulcus subcentralis anterior, sea. 



Sulcus subcentralis posterior, scp. 



Sulcus retrocentralis superior, ros. 



Sulcus retrocentralis inferior, roi. 



Sulcus interparietalis, ip. 



Sulcus interparietalis, lateral 



branches, ipl. 

 Sulcus occipitalis transversus, tr. 

 Sulcus occipitalis lateralis, lun. 

 Sulcus occipitalis superior, occ. sup. 

 Sulcus occipitalis inferior, occ. inf. 

 Sulcus temporalis superior, ts. 

 Sulcus temporalis medius, tm. 

 Sulcus temporalis transversus, tt. 



Mesial and Inferior Surfaces 



Sulcus rostralis, ro. 

 Sulcus cinguli, sc. 

 Sulcus praecuneus, pc. 

 Sulcus subparietalis, sp. 

 Incisura parieto-occipitalis, ipo. 

 Fissura parieto-occipitalis, fpo. 

 Fissura calcarina, cal. 

 Sulcus retrocalcarinus, real. 

 Sulci subcalcarini, subc. 

 Sulcus temporalis inferior, ti. 

 Fissura hippocampi, fh. 

 Fissura collateralis, co. 

 Sulcus rhinalis inferior, sri. 

 Sulci orbitales, or. 

 Sulcus olfactorius, 0. 



440 



