Crescent City, California, to Magdalena Bay, Mexico.
3⁄4 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. Moderately 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.
Plate 17h
Southeast Florida and the West Indies to Brazil.
3⁄4 inch in length, oblong in outline. With about 60 alternating large and small radiating ribs. Also with 9 to 13 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.
Plate 17k
South half of Florida and the West Indies.
1 to 11⁄2 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 3⁄4 inch, with a large orifice and thickened margins.
Plate 17i
North Carolina to south half of Florida and the West Indies.
1⁄3 inch in length, resembling L. sowerbii, but smaller with a proportion-
