Corystes cassivelaunus is a crab of unusually narrow and elongated form, which has received the popular name of “masked crab” from the grotesque resemblance which its sculptured carapace bears to a human face. It is common round all the coasts of the British Isles, and, although normally an inhabitant of the deeper water, is occasionally found at home in sandy pools on the sea shore, and is frequently cast up in hundreds on sandy shores after heavy gales.
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Walter Garstang (1896) studied this question.
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