Therefore, it seems to be, with our present knowledge, a hopeless task to analyse the branchial organs of Arthropoda and to identify them genetically in groups.
21), so that its fibres join the anterior faces of the nerve-end cells as in Vertebrates, instead of their posterior faces as in the cephalic eyes of Mollusca and Arthropoda; moreover, the lens is not a cuticular product but a cellular structure, which, again, is a feature of agreement with the Vert
It seems that there is a primitive tendency in the Arthropoda for the arteries to accompany the nerve cords, and a supra-spinal artery - that is to say, an artery in close relation to the ventral nerve cords--has been described in several cases.
It has taken some time to obtain any general acceptance of the view that the parapodia of the Chaetopoda and the limbs of Arthropoda are genetically identi cal structures; yet if we compare the para podium of Tomopteris or of Phyllodoce with one of the foliaceous limbs of Branchipus or __; Apus, the
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