. The Journal of comparative neurology and psychology. end of this article. diencephalon and telencephalon is clearly marked dorsally by a deepvelum transversum which forms the anterior wall of the dorsal sacbelonging to the diencephalon, and the posterior wall of the para-physis belonging to the telencephalon (Fig. 1). In front of the para-physis the membraneous roof is complexly infolded to form the plexus Johnston, Forehrain Vesicle in Vertebrates. 465 chorioideus of the telencephalon. The anterior limb of the plexusis attached to the massive nervous wall which overarches the frontpart of t
. The Journal of comparative neurology and psychology. end of this article. diencephalon and telencephalon is clearly marked dorsally by a deepvelum transversum which forms the anterior wall of the dorsal sacbelonging to the diencephalon, and the posterior wall of the para-physis belonging to the telencephalon (Fig. 1). In front of the para-physis the membraneous roof is complexly infolded to form the plexus Johnston, Forehrain Vesicle in Vertebrates. 465 chorioideus of the telencephalon. The anterior limb of the plexusis attached to the massive nervous wall which overarches the frontpart of the median ventricle. In the more primitive selachians suchas Heptanchus and in Chimsera the massive roof is smaller and themembraneous roof extends farther forward. As shown in Fiff. 1,the massive roof is pierced from the dorsocephalic surface by a vas-cular canal which reaches nearly to the ventricle. This has beeninterpreted (Johnston, 1906) as the remnant of a deep groove whichseparated the lateral lobes of the telencephalon earlier in the phylo-. IV vent
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