Abstract
IN NATURE for June 4 (p. 106) Mr. John Bidgood recorded the presence of this Hydrozoon in vast numbers on submerged roots and stems in the Ant, Bure, and Thurne. Till then its only known Norfolk locality was that given in Allman—“an agricultural drain near Lynn Regis.” This summer innumerable colonies were to be seen on weed floating on the surface on both sides of the Thurne from Ludham Bridge right up to Hickling Broad. A boatman told me he had seen “them insecs” every summer for many years past. Mr. Edward Corder, the Secretary of the Norwich Natural History Society, took some early in June, and some, which he was good enough to send me, is still living in a 4-ounce bottle. All the authorities state that Cordylophora is a “light-shunning animal,” and the localities hitherto recorded certainly warranted such a conclusion. But the colonies taken from the surface of the water by Mr. Corder, and those I took some time later, were stronger and cleaner than those obtained from below the surface. I distributed some of the gathering which I brought back to London, and learn that it is all doing well in ordinary aquaria. Some that I sent to Mr. Bolton for distribution unfortunately died in transit. One large colony, some eight inches long, on the stem of a Potamogeton, was kept in the shade for a fortnight; the tubes became flaccid, and the hydranths pendent, but they revived within twenty-four hours when exposed on the ledge of a window with a western aspect. This seems to point to a change of habit. All the colonies were doubtless founded below the surface of the water, and the weeds, when cut to clear the fairway for wherries, were floated up towards Hickling Broad by the tide. But if reproduction takes place—as it certainly does—under these conditions, is it not probable that we shall have a race tolerant of direct light, if not as sensitive thereto as Hyadra vulgaris?
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SCHERREN, H. Cordylophora lacustris. Nature 44, 445 (1891). https://doi.org/10.1038/044445a0
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DOI: https://doi.org/10.1038/044445a0
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