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TROCHIDAE 109
Margarites succinctus Carpenter Tucked Margarite
Alaska to Lower California.
Figure 31a
Vs, inch in length, 4 whorls, sHghtly wider than long, smoothish except
for microscopic, weak threads or incised lines. Umbilicus small, round, deep.
Exterior grayish brown, commonly with microscopic, brown, spiral lines.
Aperture dark-greenish iridescent. Littoral on algae; common.
Subgenus Pupillaria Dall 1909
Margarites pupillus Gould Puppet Margarite
Bering Sea to San Pedro, California.
Figure 31c
Vs to Y2 inch in length, whorls 5 to 6, upper whorls with 5 to 6 smooth-
ish, small, spiral threads, between or over which are microscopic, axial, slant-
ing threads. Umbilicus a minute chink. Exterior dull, chalky whitish to
yellowish gray. Aperture rosy to greenish pearl. Apex usually eroded. A
common littoral species in the northern half of its range. Also dredged in 50
fathoms.
Genus Lischkeia P. Fischer 1879
Subgenus Turcicula Dall 1881
Lischkeia bairdi Dall Baird's Spiny Margarite
Bering Sea to Coronado Islands, Mexico.
Plate 3 c
2 inches in length, moderately fragile, sculptured with varying number
of spiral rows of fairly large beads. No umbilicus. Shell white with a thin,
glossy, yellowish-green periostracum. Interior of aperture pearly-white. This
is a choice deep-water species much sought after by collectors. Moderately
common in 100 to 600 fathoms.
Subgenus Cidarina Dall 1909
Lischkeia cidaris Carpenter Adams' Spiny Margarite
Alaska to Lower California.
Figure 3ih
I to I /4 inches in length, moderately solid, similar to L. bairdi but with
a higher, flat-sided spire. The suture is usually more impressed. Color gray
to grayish white. Moderately common from 20 to 350 fathoms.