Die Typenlehre und E. Haeckel's sog. Gastraea-Theorie

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G.J. Manz, 1874 - 30 páginas
 

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Página 23 - ... rest of the series ; and it is curious to remark, that throughout, the outer and inner membranes appear to bear the same physiological relation to one another as do the serous and mucous layers of the germ ; the outer becoming developed into the muscular system and giving rise to the organs of offence and defence ; the inner, on the other hand, appearing to be more closely subservient to the purposes of nutrition and generation.
Página 23 - Medusae with the corresponding membranes in the rest of the series ; and it is curious to remark, that...

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