620 E. H. .1. SCHUSTER. 



brauclies, which are better marked in the left hemisphere 

 than in the rig-ht. 



The sulcus ciuguli (Sc.) (intercalary or calloso-marginal 

 fissure) is quite t_ypical in its arrangement. At its anterior 

 end lie two shallow sulci rostrales (vo.), witli the upper of 

 which it is, in the riglit hemisphere, in connection. 



Tlie sulcus collateralis (Col.) is in the right hemi- 

 sphere divided into three segments ; the most anterior of these 

 (col.^) lies obliquely between the sulcus rhinalis and the 

 anterior end of the sulcus temporalis superior. The middle 

 segment (col.^) is the longest; it runs sagitally backward. 

 Between its posterior portion and the sulcus calcarinus lies 

 the third segment (ro/..,), the main portion of which runs 

 parallel to that fissure, to end posteriorly in a transverse 

 member. In the left hemisphere only two segments are 

 present, the anterior [col.-^) corresponding exnctly to the 

 anterior segment in the right hemisphere, while the posterior 

 segment of the left hemisphere corresponds to the two 

 posterior segments of the right ; at its hinder end it runs 

 upwards and ends very close to the sulcus calcarinus. 



In the left hemisphere a shallow T-shaped sulcus (T.) is 

 present lying between the posterior part of the sulcus colla- 

 teralis and the sulcus calcarinus. 



The sulcus rhinalis [rh.) is quite typical. 



The sulcus lunatus (Jun.) (" Aftenspalte ") is well 

 developed in both hemispheres; its })osterior li|) is produced 

 forwards to form an operculum.' Cuiving round its lower 

 end is the deep sulcus occipitalis inferior. 



The sulcus occipitalis inferior (0/.), the upper li]) of 

 which is produced downwards to form a well-marked oper- 

 culum. Behind this fissure, curving round the tentorio-lateral 

 margin, is another sulcus, which is independent in the right 

 hemisphere, but connected Avith it in the left. 



The sulcus occipitalis lateralis [01.) lies horizontally 

 between the sulcus lunatus and the occipital pole. It is a 

 very deep fissure, -which cuts obliquely downwards into the 

 hemisphere so that its lower lip forms an operculum. Its 



