Abstract
THE second part of the Zeitschrift für Wissenschaftliche Zoologie for 1899 contains two important contributions to the morphology of invertebrates. The first, by Dr. P. Obst, discusses the fate of the hucleolus in the development of the ovum of certain Molluscs and Arachnids; while the second, by Dr. E. Zander, deals with the abdominal bristle-like apparatus of the Hymenoptera. Especial interest attaches to the latter communication from the author's discovery that the first formation of the abdominal appendages and of the accessory sexual organs (gonapophyses) belongs to two distinct periods of development. The first of these are truly embryological, making their appearance during ovular development, whereas the second do not commence till an early larval stage is attained.
Article PDF
Rights and permissions
About this article
Cite this article
Scientific Serial. Nature 60, 432 (1899). https://doi.org/10.1038/060432a0
Issue Date:
DOI: https://doi.org/10.1038/060432a0