Abstract
TRANSVERSE COMMISSURE IN ARTHROPODS.—From a recent memoir laid before the Belgian Academy by M. Lienard (Archives de Biologie, tom. i. fasc. 2), it would appear that an arrangement of the cephalic nerve-centres, hitherto thought to have been peculiar to Crustacea, is really to be found in nearly the whole of the Arthropoda. It has been long known that in Crustaceans, e.g., Decapoda, besides the super and sub-œsophagean ganglionic masses and their lateral connections, there is a well-marked transverse commissure, situated in front of the sub-œsophagean mass, and iminediately behind the œsophagus. This commissure in other Arthropoda seems, from quite technical causes, to have escaped notice. M. Lienard finds it nearly everywhere among the Myriapoda, Coleoptera, Odonata, Lepidoptera, Hemiptera, Diptera (nymphs and larvæ). He has dissected the complete ring in nearly 100 forms, belonging to 70 genera. He is trying to ascertain the origin of the fibres which form the transverse commissure.
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Biological Notes . Nature 22, 520–521 (1880). https://doi.org/10.1038/022520a0
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DOI: https://doi.org/10.1038/022520a0