286 American Seashells 



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- 



