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Rh Figure 65. Atlantic Coast False Limpets. Side and interior views of a, Siphonaria alternata Say; b, S. pectinata Linne. Natural size. Siphonaria alternata Say Say's False Limpet Figure 65a Southeast Florida (and Sarasota), the Bahamas and Bermuda. % to % inch in length, with about 20 to 25 small, white, radial ribs between which are smaller riblets. Background gray to cream. Interior glossy-tan, sometimes striped or mottled with dark-brown. Fairly common on rocks near the shore line.