Embryological Studies on Diplax, Perithemis, and the Thysanurus genus Isotoma. [Please select]
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As he stated, this high degree of individual variation seems to be due to the embryological development of the system, wherein many of the adult channels of circulation are derived from embryonic plexuses. [Please select]
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” On embryological grounds, he observes, we should “place true Echini lowest, then the Clypeastroids, next the Echinolamps, and finally the Spatangoids. [Please select]
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