Journal of the Academy of Natural Sciences of Philadelphia . urface entirely smooth as may beseen in figs. 19 and 20, Plate XXXVII,and comparing these with PlateXXXVII, fig. 1, Plate XXXVIII, fig. 11,etc. In others, it becomes furrowed, andthis furrowing gradually increases incomplexity as we ascend towards Man,at the same time that the whole lobe be-comes relatively smaller, its place being-taken by the progressively increasing in the region between the occipital and occipo-frontal lobes of the pits de passage The consideration of theevolution of these fissures and convolutions w
Journal of the Academy of Natural Sciences of Philadelphia . urface entirely smooth as may beseen in figs. 19 and 20, Plate XXXVII,and comparing these with PlateXXXVII, fig. 1, Plate XXXVIII, fig. 11,etc. In others, it becomes furrowed, andthis furrowing gradually increases incomplexity as we ascend towards Man,at the same time that the whole lobe be-comes relatively smaller, its place being-taken by the progressively increasing in the region between the occipital and occipo-frontal lobes of the pits de passage The consideration of theevolution of these fissures and convolutions we will reserve for future discussion. BOUNDARIES OF THE LOBES OF THE CEREBRAL HEMISPHERE. 1. The occipito-frontal lobe is separated posteriorly from the occipitnl lobe bythe upper branch of the occipital arch, 0 1, superior occipital fissure, which in itsturn has been separated by previous writers into two separate fissures, the internalperpendicular (parietooccipital), and the external perpendicular (occipital), and pro- 37 JOURX. A. X. S. PHILA., VOL. Fig. 8.
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Keywords: ., bookcentury1800, bookdecade1810, booki, booksubjectnaturalhistory
