Abstract
1. Apparatus was developed which made it possible to determine whether commensals of the polynoid genus Arctonoe are attracted by specific substances to their hosts and whether they can distinguish between water coming from an aquarium containing their host and sea-water alone or water from non-host.2. Arctonoe fragilis (Baird) commensal with the star Evasterias troschelii Stimpson are clearly attracted to their host and can distinguish between water coming from their host and sea-water alone. Arctonoe (pulchra-vittata?) commensal with the cucumber Stichopus are likewise attracted to their host.3. Arctonoe fragilis commensal with Evasterias are not attracted to the non-host star, Pisaster, occurring in the same immediate environment as their host. Arctonoe (pulchra-vittata?) commensal with the cucumber Stichopus are likewise not attracted to the non-host Cucumaria.4. Arctonoe (pulchra-fragilis?) commensal with the mud-star Luidia are not attracted, under these experimental conditions at least, to their ow...
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