Figure 4. Two specimens of the Charleston Slit Shell, Perotrochus charlestonensis, from the base of the Tennessee Bioherm 1. This species was previously known only from the Charleston Bump, an area due east of Charleston, South Carolina. The characteristic slit of this group of snails is shown clearly here. This is a natural feature of the shell that forms the anatomical midline of the snail's body. Image courtesy of Brooke et al, NOAA-OE, HBOI.
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