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TROCHIDAE 115
% to I Inch in length, heavy for its size; whorls angular, with the upper
third slightly concave to flat and the somewhat angular periphery flatfish.
Early whorls with minutely beaded threads, later whorls with fine, smoothish
cords of various sizes. Nucleus tan to whitish. Color yellowish brown
with a few spiral lines of alternating brown and white bars. Sometimes axially
variegated. Dredged just off-shore from 8 to 35 fathoms. Moderately common.
Calliosto772a gemmiilatii7n Carpenter Gem Top-shell
Cayucos, California, to the Gulf of California.
Figure 33d
% inch in length, not as wide; characterized by its dark gray-green color
and two extra-strong, beaded spiral cords. There are also 3 or 4 minor cords
that are not so heavily beaded. Nucleus dark-tan. Moderately common in
the littoral zone on rocks and wharf pilings.
Calliostoma supragranosmit Carpenter Granulose Top-shell
Monterey, California, to Lower California.
Plate 1 8s
^ inch in length, solid, glossy; characterized by numerous, fine, spiral
cords which are sometimes weakly beaded, and by a wide, rather flattish pe-
riphery. Nucleus tan. Color light yellowish brown, commonly with a spiral
row of subdued white spots at the lower periphery. Interior brightly nacre-
ous. Moderately common on rocks at low tide.
CalUost07na a7272ulatU77t Solander Ringed Top-shell
Alaska to San Diego, California.
Figure 33f
I to 1/4 inch in length, not quite so wide; characterized by its light
weight, golden-yellow color with a mauve band at the periphery, and by the
numerous, spiral rows of tiny, distinct beads (5 to 9 rows in the spire whorls).
Nucleus pink. Dredged offshore and occasionally washed ashore. Formerly
C. annulatum Martyn.
Calliosto77m canaliculatinn Solander 1786 Channeled Top-shell
Alaska to San Diego, California.
Plate 3q; figure 33!!
I to 1% inches in length, not heavy, sides of whorl flat. Periphery of
the last whorl sharp. Base of shell almost flat. Characterized by sharp, promi-
nant, slightly beaded, spiral cords. Color yellowish tan. Nuclear whorls
white. Moderately common off^shore. Found on floating kelp weed. For-
merly known as C. canalicukumt Martyn, and doliarhmi Holten 1802.