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230 American Seashells
Neptunea ventricosa Gmelin Fat Neptune
Arctic Ocean and Bering Sea.
Plate 24s
3 to 4 inches in length, heavy, with a large, ventricose body whorl.
Axial ribs or growth lines coarse and indistinct, rarely lamellate. Shoulders
sometimes weakly nodulated. Spiral cords absent or very weak. Color a
dirty-brownish white. Aperture white or flushed with brownish purple.
Moderately common offshore. This is Chrysodomus satura Martyn and its
several poor varieties.
Neptunea pribiloffensis Dall Pribiloff Neptune
Bering Sea to British Columbia.
Plate 241
4 to 5 mches in length, similar to N. lyrata, but with a lighter shell, with
weaker and more numerous spiral cords, and with more numerous and
stronger secondary spiral threads. Outer lip more flaring and the siphonal
canal with more of a twist to the left. Fairly commonly dredged from 50 to
100 fathoms.
Neptunea lyrata Gmelin Common Northwest Neptune
Arctic Ocean to Puget Sound, Washington.
Plate 24q
4 to 5 inches in length, % as wide, solid, fairly heavy. With 5 to 6
strongly convex whorls, bearing about 8 strong to poorly developed, raised
spiral cords (2 of which usually show in each whorl in the spire). Faint,
quite small, spiral threads are also present. Exterior dull whitish brown.
Aperture enamel-white with a tan tint. Fairly common in Alaska from shore
to 50 fathoms. This is Chrysodo?mis Jirata Martyn.
Subgenus Ancistrolepis Dall 1894
Neptunea eucosmia Dall Channeled Neptune
Alaska to Oregon.
Figure 516
1V2 inches in length, solid, outer lip sharp, strong and crenulated. Si-
phonal canal short, wide and slightly twisted. Spiral cords strong. Suture
channeled. Shell chalk-white, but covered with a rather thick, yellow-brown
to gray periostracum which is axially lamellate and bears minute, erect hairs.
Aperture glossy-white. Not uncommonly dredged from 62 to 780 fathoms.
N. californica Dall and bicincta Dall appear to be this species.