. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 471 out principally by means of the Weigert, Pal, Golgi and anilin blue black staining methods. The fibres of the external olfactory root arise as axis-cylinder processes of the "mitral cells" of the olfactory and terminate by means of "collaterals" and end-branchings in re- lation with the protoplasmic processes of the cells of the pyriform lobe (uncus) and olfactory tract as demonstrated already by Ramon t Cajal ("Neue Darstellung vom histologischen Bau des Centrain er vensystem s", Archiv f. A
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 471 out principally by means of the Weigert, Pal, Golgi and anilin blue black staining methods. The fibres of the external olfactory root arise as axis-cylinder processes of the "mitral cells" of the olfactory and terminate by means of "collaterals" and end-branchings in re- lation with the protoplasmic processes of the cells of the pyriform lobe (uncus) and olfactory tract as demonstrated already by Ramon t Cajal ("Neue Darstellung vom histologischen Bau des Centrain er vensystem s", Archiv f. Anatomie und Physiologie, Heft VI, 1893). No fibres can be traced by this route into the hippo- campus, as stated by Edinger and Herrick (loc. cit). The external root and the middle root (which goes to the pes pedunculi) will not be considered in this paper. Before describing the internal root, some reference must be made to the relations of the mesial hemisphere wall in Ornithorhynchus. In front of the anterior commissure there is an area of grey matter { Fig. 1) Kf •^' dLL-vJ&jGk- . o[{1U. Fig. 1. Mesial aspect, cerebrum of Platypas; enlarged. which is directly continuous behind with the thickened lamina terminalis which lies between the anterior commissure and the hippocarapal commissure {h. f) and which is the homologue of the septum pellu- cidum of higher mammals. Above, this region is directly continuous with the fascia dentata below with the "quadrilateral area" of Broca and in front (below) with the mesial olfact. root {in. o. r.). This area is developed in Platypus from the posterior olfactory lobule of this and is homologous to the gyrus subcallosus of Zuckerkandl — the peduncle of the corpus callosum of human anatomy. Both of these terms are inapplicable to the monotreme. 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
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