Abstract
IN NATURE of Nov. 16, p. 760, Mr. H. C. Chadwick records a case of regeneration of the spines in Echinus esculentus. While working at the Marine Laboratory, Plymouth, last summer, I noticed a number of specimens of Psammechinus miliaris behaving in a similar way. The individuals belonged to a small, deep water race obtained from about 15 fathoms near the Eddy-stone. On July 25 about thirty specimens were placed in a bowl under circulation and kept in darkness. A similar number were exposed to direct sunlight. The former lot remained healthy and underwent no change. About half of the lot kept in the light threw off all their spines except those on the oral surface, which were unaffected. A week afterwards a fresh crop of minute spines began to appear. These grew so rapidly that in two months the majority of these individuals could scarcely be distinguished from those which had not thrown off their spines.
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HOBSON, A. Regeneration of the Spines in Sea-Urchins. Nature 125, 168 (1930). https://doi.org/10.1038/125168c0
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DOI: https://doi.org/10.1038/125168c0
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