. Journal of comparative neurology . Fig. 72 Section through the hippocampal commissure, fornix columns andneuroporic recess. Fig. 73 Section mm. rostral to the last. The zona limitans is sharplymarked by the precommissural fibers as in the opossum and rabbit. Islands ofCalleja come up to this level as in the other forms. SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 469 ?^i^^^^. 76 Fig. 74 Section mm. rostral to the last. Note that in the bear theprimordium hippocampi has become almost thin enough to be called a septumpellucidum. Fig. 75 Section behind the genu and cutting the rostru

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. Journal of comparative neurology . Fig. 72 Section through the hippocampal commissure, fornix columns andneuroporic recess. Fig. 73 Section mm. rostral to the last. The zona limitans is sharplymarked by the precommissural fibers as in the opossum and rabbit. Islands ofCalleja come up to this level as in the other forms. SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 469 ?^i^^^^. 76 Fig. 74 Section mm. rostral to the last. Note that in the bear theprimordium hippocampi has become almost thin enough to be called a septumpellucidum. Fig. 75 Section behind the genu and cutting the rostrum beneath. Notethat here the indusium coming down around the genu as in all forms is continueddown from the rostrum toward the olfactory peduncle. It is diagrammaticallyrepresented in black. This is essentially the condition of the hippocampus inthe embryos of higher mammals and man. Fig. 76 Bear, a part of the section shown in figure 73, drawn at a higher mag-nification. Description in the text.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191