1⁄4 inch in length, equally wide, very thick-shelled, resembling in shape a Margarites. Pure white in color. Whorls rounded, 5 to 6 in number, each bearing 5 to 6 strong, rounded, spiral cords, the lower 2 being below the periphery of the whorl. Aperture and parietal wall glossy, slightly opalescent. Columella arched, with a small tooth in the middle and a smaller one usually at the base. No umbilicus. Commonly dredged from 35 to 450 fathoms.
H. linnei Dall from southeast Florida to Barbados has 8 smaller, beaded spiral cords on the upper part of the whorls and 10 on the base, otherwise it is very similar to albida. It is quite rare.
Plate 18i
Alaska to Lower California.
1⁄4 to 3⁄8 inch (5 to 9 mm.) in length, solid, globose. Pinkish red to brownish red in color. Last whorl and base with 15 to 20, evenly sized, smooth, spiral cords separated from each other by a space about half as wide as the cords. Base of pearly columella with 2 or 3 exceedingly weak nodules. A very common species frequently washed ashore and inhabited by small hermit crabs from Monterey to Mexico. Do not confuse with lurida.
Puget Sound to Lower California.
1⁄4 inch (5 to 7 mm.) in length, similar to carpenteri, but half as large, black-brown in color, although occasionally whitish with red axial streaks. The spiral cords are usually fewer in number and more rounded. Moderately common in shallow water under rocks.
Puget Sound to Lower California.
1⁄4 inch or less in length, similar to carpenteri but with a flatter spire, and smoothish, except for numerous incised, spiral lines producing very weak threads. Color dark, rosy-brown. A moderately common shallow-water species, sometimes found with carpenteri. A thorough anatomical and life history study of this genus is needed to ascertain the validity of these species.
Family Phasianellidae
Genus Tricolia
