. The Journal of comparative neurology and psychology. IV vent. Fig. 2. A, an outline of the brain and brain ventricles of Mustelus asseen from above. B, a diagram of one side of the fore-brain to show theprimitive relations of the wall and ventricle. From Johnston, 1906. geny of selachians, and the process by which the present fonn wasreached is indicated by the accompanying diagram (Fig. 2, B). That portion of the massive roof which lies behind the vascularcanal is formed by the great growth of the lateral walls and it hasfor its basis a fiber-decussation which is comparable in position andi
. The Journal of comparative neurology and psychology. IV vent. Fig. 2. A, an outline of the brain and brain ventricles of Mustelus asseen from above. B, a diagram of one side of the fore-brain to show theprimitive relations of the wall and ventricle. From Johnston, 1906. geny of selachians, and the process by which the present fonn wasreached is indicated by the accompanying diagram (Fig. 2, B). That portion of the massive roof which lies behind the vascularcanal is formed by the great growth of the lateral walls and it hasfor its basis a fiber-decussation which is comparable in position andin a part of its fiber components to the superior olfactory decussationof Petromyzon. In selachians, then, owing to the enormous devel-opment of the olfactory centers, that part of the membraneous roof ofthe telencephalon which contains fibers in cyclostomes is invaded bygray matter as well. 466 Journal of Comparative Neurology and Psychology. The form of the ventricle is shown in Fig. 2, and it is necessaryonly to point ont that quite distinct lateral ventric
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