. The Journal of comparative neurology and psychology. e olfactory bulbs and also have a caudal prolongation into theso-called occipital pole of the hemisphere. The tela of the diencephalon is separated from the membraneousroof of the telencephalon by a prominent velum transversum whichin the adult becomes complexly folded in connection with the chorioidplexus. In front of the velum is a highly developed paraphysis. 490 journal of Comparative Neurology and Psychology. Practically the whole of the membraneous roof of the telenceph-alon is involved in the two complex structures, the chorioid ple
. The Journal of comparative neurology and psychology. e olfactory bulbs and also have a caudal prolongation into theso-called occipital pole of the hemisphere. The tela of the diencephalon is separated from the membraneousroof of the telencephalon by a prominent velum transversum whichin the adult becomes complexly folded in connection with the chorioidplexus. In front of the velum is a highly developed paraphysis. 490 journal of Comparative Neurology and Psychology. Practically the whole of the membraneous roof of the telenceph-alon is involved in the two complex structures, the chorioid plexuseswhich extend into the lateral ventricles and the paraphysis whichprojects upward between the lateral lobes. The essential fact isthat the membraneous roof extends forward over the interv^entricularforamina to meet the lamina terminalis. The roof of the telen-cephalon near the middle line is membraneous for its whole length. The questions regarding the anterior end of the brain and theboundary between diencephalon and telencephalon have been most. Fig. 25. Amblystoma p., after closure oi: neuropore, model of the righthalf of the head, viewed from the medial surface, x 25. carefully studied in embryos of Amblystoma punctatum. In theseembryos the entoderm, mesoderm and notochord present essentiallythe same features and the same relations to the brain as in particular, the premandibular somites, the median undifferentiatedmass in which the notochord ends anteriorly, and the preoral ento-derm have the same disposition as in selachians. The only differenceis that all the structures are more compact in amphibians and thepreoral entoderm is shorter. As Figs. 23, 24, 25 show, the preoralentoderm fills the angle between the floor of the neural tube (neuralplate) and the ectoderm and there is a short prolongation of thearchenteric cavity into it in front of the site of the future neural plate is bounded by neural folds which meet in frontin the transverse term
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