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1. It is shown that Pinnotheres ostreum invades its host, Crassostrea virginica in the first crab stage and not in the hard-shelled stage as hitherto believed.2. The finding of the first crab stage both in plankton samples and inside oysters marks the first find in nature of this stage for any pinnotherid crab.3. A preliminary description is given of the following pre-hard stages, which were the last unknown stages in the developmental cycle of P. ostreum. Both sexes of these stages were found only in the oyster and are never free-living. A full life-history of a pinnotherid crab is now known for the first time.4. Invasion of the oyster in Delaware Bay takes place in late summer at a time when most of the oyster spat have grown sufficiently large to harbor one or more crabs.5. More crabs invade spat than yearlings and older oysters, but the survival rate is higher for crabs invading the latter groups of oysters.6. The growth rate of the crab from the invasive to the mature stage is shown to be positively ...

LIFE-HISTORY AND BIOLOGY OF THE OYSTER CRAB, PINNOTHERES OSTREUM SAY