The elasmobranch fishes . elasmobranchfish03dani Year: 1934 232 THE ELASMOBRANCH FISHES although in it fusion is greater. From Heterodontus to Scoliodon (fig. 211a) a series of forms may be obtained, showing a progressive specialization to a condition in which practically no sign of right and left lobes remains. In the component parts of the telencephalon there is also great diversity. The median olfactory nucleus () produces very different effects depend- ing on the degree of its own development and also on the degree of fusion of the right and left telencephalic lobes. In Scymnus these

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The elasmobranch fishes . elasmobranchfish03dani Year: 1934 232 THE ELASMOBRANCH FISHES although in it fusion is greater. From Heterodontus to Scoliodon (fig. 211a) a series of forms may be obtained, showing a progressive specialization to a condition in which practically no sign of right and left lobes remains. In the component parts of the telencephalon there is also great diversity. The median olfactory nucleus () produces very different effects depend- ing on the degree of its own development and also on the degree of fusion of the right and left telencephalic lobes. In Scymnus these nuclei constitute a

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