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suleus, into which the sulcus interparietalis terminates (sule. occipitalis 
transversus) ; 
4. The occipital extremity of the suleus calcarinus falls (whether 
bent or not round the mantle-side) behind it, and sometimes extends 
between two sulci occipitales which are found there (they may be 
connected V-shaped). 
Fig. I represents an occipital lobe (of an idiot) 
seen from behind on which the above-mentioned 
desiderata have been most accomplished. 
The principal requirements are fulfilled: the 
situation of the sulci occipitalis transversus (0.t.) 
and calearinus (c.a) resp. before and behind 
the suleus lunatus (Lun) is typical. At the 
former the suicus interparietalis (..p.) terminates ; 
Pig! 1. the suleus parieto-occipitalis (po) cuts frontally 
Occipitallobe of theidiot from it the medial mantle-side. An indication 
D,seen from behind. The of a V-shape of the occipital sulci (0) between 
dotted line indicates the which the sule. calcarinus points, is extant. 
direction of the section 
according to which fig. 4 : 
has been drawn; for the not immediately connected with the sulc. tem- 
shortenings vide text. poralis primus (¢,.. All other hemispheres pos- 
The suleus praelunatus (pr{.) is distinct, but 
sessing the suleus lunatus have a similar appearance. The greatest 
variation exists in the occipital sulci and the relations of the suleus 
praelunatus. All our cases answer to the above-mentioned principal 
requirements, where a suleus lunatus was admitted, with only one 
exception. In the latter case (it regards the cerebrum of an idiot, 
with a too little frontocaudal diameter; weight of the brain about 
1000 grams) the cuneus is very narrow, because the sulcus calcarinus 
has a strongly dorsal direction. I refer to 
fig. 2. At the limitation of the second and 
posterior third part of the cuneus this sulcus 
splits T-shaped. The inferior branch terminates 
near the occipital pole, behind the sulcus 
lunatus, the dorsal branch reaches the medial 
mantle-side immediately behind the sulcus 
parieto-occipitalis; consequently not only far LEH acco lone Ob tie 
before the sulcus lutanus, but even before idiot W, seen from the me- 
the sulcus occipitalis transversus. Vide fig. 3. dial side. 
I come to the conclusion that this branch 2° = Sulc. parieto-oecipitalis 
} ca = sulc. calcarinus 
must indeed be reckoned to the sulcus ¢ — corpus callosum (sple- 
Fig; 2: 
calcarinus, and is not a cuneus-sulcus — nium). 
