Figure 31a
Alaska to Lower California.
1⁄8 inch in length, 4 whorls, slightly 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
Figure 31c
Bering Sea to San Pedro, California.
1⁄3 to 1⁄2 inch in length, whorls 5 to 6, upper whorls with 5 to 6 smoothish, small, spiral threads, between or over which are microscopic, axial, slanting 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
Plate 3c
Bering Sea to Coronado Islands, Mexico.
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
Figure 31h
Alaska to Lower California.
1 to 11⁄2 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.
