Journal of the Academy of Natural Sciences of Philadelphia . 0= occipital lobe; 0F= occipitofrontal lobe; OT= occipitotemporal lobe; S. S., Sylvian fissure;t-rad., fissuratri-radiatus; M. a., mesial arched fissure; Cal., callosal fissure; Hp., hippocampal fissure; Ca.,calcarine fissure. fissures pointed out above as fundamental have really the importance and signifi-cance ascribed to them. These fissures are present in all the monkeys as the bestmarked fissures of the hemisphere, and we may trace, in a descending scale, thegradual disappearance of the other fissures, until in the lowest form o
Journal of the Academy of Natural Sciences of Philadelphia . 0= occipital lobe; 0F= occipitofrontal lobe; OT= occipitotemporal lobe; S. S., Sylvian fissure;t-rad., fissuratri-radiatus; M. a., mesial arched fissure; Cal., callosal fissure; Hp., hippocampal fissure; Ca.,calcarine fissure. fissures pointed out above as fundamental have really the importance and signifi-cance ascribed to them. These fissures are present in all the monkeys as the bestmarked fissures of the hemisphere, and we may trace, in a descending scale, thegradual disappearance of the other fissures, until in the lowest form of monkeys,the Arctopithecini or marmosets, they remain as the only fissures of the hemisphere,as may be seen in the brain of Hapale jacchus and Midas, PI. XXXIV, figs. 11, 12and 13. They are also the first to appear in the development of the foetal monkeybrain as shown in PI. XXXIV, figs. 27 and 28, which represent the condition asfound in a foetal Cefais apella. No other fissures are present in these brains, therest of the cerebral hemisphere remaining en
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Keywords: ., bookcentury1800, bookdecade1810, booki, booksubjectnaturalhistory
