. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 441 to be the sulcus lunatus in more than 200 human brains and a large series of Apes and have been able to demonstrate its value as the one decisive criterion in the sure identification of the "Affenspalte". It is clear that it is the rapid expansion of the area striata which calls the sulcus lunatus into being. The other effects of its growth vary considerably in different genera. In most Apes the whole of the mesial part of the area striata becomes deeply involuted so that a vertical section through its posterior

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. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 441 to be the sulcus lunatus in more than 200 human brains and a large series of Apes and have been able to demonstrate its value as the one decisive criterion in the sure identification of the "Affenspalte". It is clear that it is the rapid expansion of the area striata which calls the sulcus lunatus into being. The other effects of its growth vary considerably in different genera. In most Apes the whole of the mesial part of the area striata becomes deeply involuted so that a vertical section through its posterior (i. e. broader) part (e. g. in a Cercopithecus aethiops) presents the peculiar appearance represented in Figure 5. None of the area striata is exposed on the surface but the whole of the walls of the deep furrow which most writers would call "calcarine" (s. i. m.) is formed of cortex containing the stripe of Gennari. The result of this infolding of the whole breadth of the area striata is the formation of a very deep fossa which extends forward to the region where the stria-bearing region is much narrower: consequently the walls of the anterior part of the "fossa striata" (as we may call it) are not wholly formed of area striata, because the latter is much too narrow and forms only the deeper part of the furrow (Fig. 6). Still further forward the fossa is prolonged s. 1. m.. foss. str. —'- , _, str. Gennan s. 1. m.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Anatomische Gesellschaft. Jena : G. Fischer