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The adults and vase-shaped egg-capsules of the oyster drill are found on rocks between tide levels. Near Woods Hole, Mass., they are abundant at Grassy Island (the Spindle) and at Sheep Pen Cove on Nonamessett Island. The sexes are separate. Males are easily recognized by the long, curved penis, which is located on the right side of the body behind the eye.
Federighi (1931) and Nelson (1931) both observed that breeding begins when the water temperature has remained for at least a week above 20° C. At Woods Hole, the season begins late in May (Bumpus, 1898), and probably continues throughout the summer.