Interambulacral sections of live test from Echinus esculentus, pieces of dead test, and settlement slates coated with various echinoid and barnacle extracts were made available to settling cypris larvae of Balanus balanoides. These cyprids appear unable to settle on live healthy test preparations of the sea‐urchin. The test of E. esculentus itself is not physically unsuitable for the settlement of cypri'ds, and there is no repulsion due to chemicals in the epithelium or the pedicellariae. However, cyprids do not appear able to settle when the pedicellariae and spines are active.
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Campbell et al. (1977) studied this question.
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