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Acad Anderson angulation anteriorly apertural view back view beaks body whorl bolivarensis Clark Calif callus Calyptraea Colombia columella Conrad Corbula depressed Dimensions of holotype elongate EOCENE GASTROPODA EOCENE PELECYPODA fairly heavy fauna figs figures Genotype by monotypy Genotype by subsequent Genus groove height of aperture hinge plate hypotype inner lip interspaces Lamarck lateral left valve length Linnaeus locality longitudinal ribs lunule main surface maximum width middle cardinal middle Eocene Miocene narrow nymph plate Oligocene outer lip outline paratype Paris Basin Peru plications portion posterior cardinal posterior dorsal edge posterior end prominent protoconch radial ribs right valve sculptured by series septa Shell medium Shell small siphonal notch smooth southern United spec species specimen spiral riblets spiral ribs strongly inturned Subgenotype Subgenus subsequent designation subsp surface sculptured suture Talara Tertiary Turritella U. C. Loc umbilicus upper Eocene varix Venericardia ventral whorls of spire width of body