Abstract
I ENCLOSE a photograph which may interest your readers. It is one of a water-colour painting of a seaurchin, magnified 4 diameters, which has been reared in my laboratory by Dr. Cresswell Shearer. It is a hybrid, a cross between Echinus milearis (male) and E. esculentus (female), both obtained from the Plymouth Marine Laboratory. The cross was effected in the early part of March last. It was kept in thoroughly aërated seawater for some time, but has for the last three months been living in a bell-jar with part of an old crock covered by worm tubes, without the water being aërated in any way. It generally shelters in the day time under the crock. When disturbed, it moves actively away from the light, and still appears thoroughly healthy. It shows what may be done in an inland laboratory with simple appliances.
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GARDINER, J. The Rearing of Sea Urchins. Nature 87, 110 (1911). https://doi.org/10.1038/087110d0
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DOI: https://doi.org/10.1038/087110d0
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