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286 lobes slightly lighter, and with blotches of black at the edges. Mantle purple- black, spotted irregularly with lighter purple. Uncommon? Subgenus Metaplysia Pilsbry 1951 Aplysia badistes Pilsbry 1951 Walking Sea-hare Biscayne Bay, Florida. And south? 2 to 4 inches in length. Mantle under the lobes with a large perforation. Sole of foot with a characteristic, muscular disk at each end. Exterior of animal dark-olive, indistinctly mottled with irregular spots of dusky buff, and having small, sparsely scattered, ragged black spots. Sole of foot yel- lowish olive. Found recently along the Venetian Causeway under rock ledges at low tide. (For details see Notulae Naturae, Philadelphia, no. 240, pp. i to 6, illustrated.) Genus Bnrsatella Blainville 181 7 Bursatella leachi plei Rang Ragged Sea-hare West and northwest Florida and the West Indies. 4 inches in length, elongate-oval, plump, soft and flabby. Greenish gray to olive in color, sometimes with white flecks. Surface covered with nu- merous, ragged filaments. Shell absent in adults. Commonly found in grassy, mud-bottom areas at low tide. The east side of Sanibel Island is a good col- lecting spot. This is the only western Atlantic species known in this genus. Formerly placed in another genus, Notarcbns Cuvier 18 17. Family PLEUROBRANCHIDAE Genus Fleiirobranchiis Cuvier 1805 Subgenus Siisania Gray 1857 Pleurobranchus atlanticus Abbott Atlantic Pleurobranch Figure 61 Southeast Florida (and the West Indies?). I % to 2 inches in length. Mantle with U-shaped notch in front where two tube-like rhinophores protrude up. Dorsum or back with numerous small rounded warts. Color yellowish orange with irregular splotches of deep maroon-brown. Largest warts translucent pale-yellow with a chocolate ring around the base. Some tipped with chalk-white. Foot pale-yellow to orang-