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Updated: May 3, 2025
The sea-squirt has in its early youth the line of cartilage through the body which, in embryonic development, represents the first stage of the backbone; the lancelet and the Appendicularia have a rod of cartilage throughout life; the "acorn-headed worm" shows traces of it.
Ninthly, a second variety of Appendicularia, described by my friend and companion, on board the Rurik, A. von Chamisso, in the tenth volume of the N. Acta Acad. Leop. Car., which proved to be a species of Mollusca belonging to the Heteropodes of Lamarck. Tenthly, a Pelagia, scarcely, if at all, to be distinguished from the Panopyra Per. Lastly, a new kind of Cestum, C. Najadis N.
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