Abstract
The distribution of sessile marine invertebrates is often the consequence of the selection of a suitable substrate by motile larvae. Motile planulae larvae ofAurelia aurita (Linnaeus) are exposed to an artificial substrate in the laboratory to determine if they possess the capacity both for specific orientation and for discrimination of surface texture at time of attachment. More than 90% (PCyanea capillata (Linnaeus). The planular effected orientation of the scyphistoma may be generally true for coastal representatives of the Semaeostomeae, and perhaps for other shallow water Scyphozoa (including the Class Cubozoa).

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