download pdf

MITRIDAE 249
in color. lo whorls. Characterized by the numerous, very small, beaded,
axial riblets and the thin, gray periostracum. Columella folds 5, the lower 2
being very weak. Nuclear whorls small, smooth and pointed. Commonly
dredged from 30 to 333 fathoms.
Mitra barbadejisis Gmelin Barbados Miter
Southeast Florida and the West Indies.
Plate 26d
1 to 1% inches in length, slender, with the aperture wide below and
half the length of the entire shell. Characterized by its yellow-brown to fawn
color which has an occasional fleck of grayish white. Aperture tan within.
Columella with 5 slanting folds. The sides of the spire are almost flat. Weak
spiral threads are often present especially in the earlier whorls. A common
species under rocks at low tidje.
Mitra hendersoni Rehder Henderson's Miter
Southeast Florida and the AVest Indies.
Plate 26c
% to % inch in length, fusiform in shape, with 8 whorls, each bearing
a dozen sharp axial ribs which extend halfway down the whorl. Numerous
microscopic, spiral cords present. Columella with 4 folds. Color drab pink-
ish gray with the upper half of the whorl bearing a wide, lighter, spiral band.
Moderately common offshore in several fathoms.
Mitra sidcata Gmelin Sulcate Miter
Southeast Florida and the West Indies.
Plate 26a
% inch in length, rather fusiform in shape, with axial ribs as in hender-
soni, but without spiral threads. 4 columella folds large and dark-brown.
Color of shell dark chocolate-brown with a narrow, white, spiral band on
the upper half of the whorl. Moderately common below low-water line
under rocks in sand. Do not confuse with Engina tnrhinella which has no
columella folds. Mitra albocincta C. B. Adams is probably this species.
Mitra idae Melville Ida's Miter
Farallon Islands to San Diego, California.
Plate 2op
2 to 3 inches in length, heavy, elongate. With 3 columella folds. Color
mauve-brown, but usually covered with a thick, finely striate, black perio-
stracum. Uncommon offshore.