During an investigation into the functional morphology and habits of Pandora inaequivalis (Allen, 1954; Allen & Allen, 1955), successful artificial fertilization of the eggs was carried out and the larvae reared past metamorphosis to the dissoconch stage. As nothing is known of its development, nor that of any other member of the suborder Anomalodesmata, it seems desirable to describe the development and relate it to the habits of the adult. The adults of P. inaequivalvis, on the Brittany coast, are local in their distribution and occur in sheltered sandy bays where they lie at or very close to the surface of the sand at low-water mark. The problem of maintaining each population would seem to depend on some means of limiting the dispersal of the young. Such a limitation was found to occur.

Methods P. inaequivalvis is a hermaphrodite bivalve, the testis and ovary maturing at about the same time. The eggs and sperm are shed directly into the sea.

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