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98 Ainerican Seash ells
Diodora mur'vna Arnold Neat-ribbed Keyhole Limpet
Crescent City, California, to Magdalena Bay, Mexico.
% inch in length, similar to aspera, but smaller, with a lower, more
rounded apex, with convex sides, a narrower shell, and with finer, much
neater cancellate sculpturing. Color white or with few, or many, broken
radial rays of gray-black. The apical hole is nearer the anterior end. Mod-
erately common on rocks. This is D. densiclathrata of authors, not of Reeve.
Genus Lucapina Sowerby 1835
Shell thin, low-conic, with the apex in front of the middle. Orifice
rather large, roundish. Margin finely crenulated. Fleshy mantle covers most
of the shell; foot larger than shell.
Lucapina sowerbii Sowerby Sowerby's Fleshy Limpet
Southeast Florida and the West Indies to Brazil.
Plate lyh
% inch in length, oblong in outline. With about 60 alternating large
and small radiating ribs. Also with 9 to 1 3 raised, concentric threads. Color
white to buff, with 7 to 9 small, splotched rays of pale brown. Inside whitish;
callus sometimes bounded by an olive-green streak. Outside of orifice not
stained. Uncommon under rocks at low tide zone. It has been erroneously
called L. adspersa Philippi.
Lucapina suffusa Reeve Cancellate Fleshy Limpet
South half of Florida and the West Indies.
Plate 17k
I to 1 34 inches in length, oblong in outline. Much like L. sowerbii, but
larger, a delicate mauve to pinkish, and with a bluish-black orifice. Inside
grayish to dirty-white. Not uncommon under rocks. Formerly called L.
cancellata Sowerby.
Genus Lucapinella Pilsbry 1890
Shell depressed, conical, less than % inch, with a large orifice and thick-
ened margins.
Lucapinella limatula Reeve File Fleshy Limpet
North Carolina to south half of Florida and the West Indies.
Plate lyi
% inch in length, resembling L. soiverbii, but smaller with a proportion-