UNALTERED NACRE FROM THE PENNSYLVANIAN BUCKHORN ASPHALT, AND IMPLICATIONS FOR THE ARMS RACE BETWEEN MOLLUSKS AND THEIR PREDATORS
COVER EXPLANATION.—Drill holes made by predatory gastropods may facilitate the preservation of their echinoid prey. A modern echinoid, Meoma ventricosa, and predatory King Helmet, Cassis tuberosa, from San Salvador Island, Bahamas (see Tyler et al. this issue). Photograph by Troy Dexter.
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