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308 American Seashells
leaves, all told, in the club of the rhinophore. Distinguished from frondosus
by the 3 to 5 small but well-marked dendriform papillae on the posterior
edge of the rhinophore sheath. Usually dredged down to 25 fathoms. Prob-
ably the largest of the American nudibranchs.
Fa7mly SCYLLAEIDAE
Genus Scyllaea Linne 1758
Scyllaea pelagica Linne Sargassum Nudibranch
Southeast United States. Other warm seas.
I to 2 inches in length. Translucent cream-brown to orange-brown.
With numerous flecks of red-brown. Body elongate. Oral tentacles absent.
Two slender long rhinophores. Sides of body with 2 pairs of large, clublike,
foliaceous gill plumes or cerata. Common in floating sargassum weed
in the Gulf Stream.
Family AEOLIDIIDAE
Genus Aeolidia Cuvier 1798
Body depressed, rather broad; branchiae a httle flattened, set in numer-
ous, close, transverse rows; 4 tentacles simple; foot broad, anterior angles
acute. Radula of a single, broad, pectinate plate,
Aeolidia papulosa Linne Papillose Eolis
Plate i5g
Arctic Seas to Rhode Island. Europe. Arctic Seas to Santa Barbara,
California.
I to 3 inches in length. Color variable: brown, gray or yellowish,
always more or less spotted and freckled with lilac, gray or brown and
opaque-white. Number of papillae fcM^er in young specimens. 30 rows in
radula of a single, broad, arched tooth bearing about 46 denticles.
Family TERGIPEDIDAE
Genus Catriona Winckworth 1941
(Cratena of authors)
Catriona aurantia Alder and Hancock Orange-tipped Eolis
Arctic Seas to Connecticut. Europe.
Plate 15J
% inch in length. Branchiae numerous, occurring in 10 or 11 close,
transverse rows, anteriorly with 5 to 6 papillae per row, posteriorly with 2