Weismann, A., 1881.: - Observations sur l'origine des cellules sexuelles des Hydroïdes. [Ann. Sci. Nat., Zool., Sér. 6, 11(6).]

Paris 1881. 8vo, 24.3cm. Pp. 37, 3 figs. on 1 lithogr. plate. Plain new wrappers.

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