The Journal of the Linnean Society of London . Vertical median section of part of the brain of Phoca vitulina, natural size. C. Crucial sulcus. Cm. Calloso-marginal sulcus. Hip. Hippocampal gyrus. 8a. Sagittal gyrus, xy. Secondary sulci. Fig. Dorsal surface of anterior median part of brain of Otaria Gillespii, natural size. C. Crucial sulcus, ^jc. Precrucial sulcus. the cerebral folds, however, a small secondary, forwardly and in-wardly proceeding sulcus could be detected on each side, so thata minute Ursine lozenge might be made out when the brainwas viewed anteriorly. A vertical section
The Journal of the Linnean Society of London . Vertical median section of part of the brain of Phoca vitulina, natural size. C. Crucial sulcus. Cm. Calloso-marginal sulcus. Hip. Hippocampal gyrus. 8a. Sagittal gyrus, xy. Secondary sulci. Fig. Dorsal surface of anterior median part of brain of Otaria Gillespii, natural size. C. Crucial sulcus, ^jc. Precrucial sulcus. the cerebral folds, however, a small secondary, forwardly and in-wardly proceeding sulcus could be detected on each side, so thata minute Ursine lozenge might be made out when the brainwas viewed anteriorly. A vertical section of the brain shows that the calloso-marginalsulcus is very widely separated from the inward prolongation of CEEEBEAL CONVOLITTIONS OF THE CAENIVOEA. 23 the crucial sulcus, the very wide and voluminous hippocampalgyrus (grooved by secondary sulci xy) rising to the surface behindthe crucial sulcus (fig. 9). The fold of cerebral substance thusinterposed is far larger than any met vpith in even the Arctoidterrestrial Carnivora. Otaria.—The brain of the Sea-Bear * is very instructive, for itsupplies what would otherwise be a missing link of much im-portance between the brain of the Seals and that of the ordinaryland Carnivora. In the first p
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectzoology, bookyear1865
