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286 American Seashells
lobes slightly lighter, and with blotches of black at the edges. Mantle purpleblack,
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
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
Southeast Florida (and the West Indies?).
7
Figure 61
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-