. Ecological aspects of two wood-boring molluscs from the continental terrace off Oregon. . -«^^_^ -^ """—• —; """"• - ---A 200 400 600 800 1000 Depth of exposure (meters) Figure 40. Average depth of maximum penetration versus depth of exposure for 60 days.

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Keywords: ., bookcentury1900, bookcollectionamerican, booksubjectoceanography