Page:American Seashells (1954).djvu/126

108 $1/2$ inch in length, $3/4$ inch in width. Angle of spire 110 degrees. Whorls strongly rounded, aperture round, umbilicus wide and deep. Outer lip and columella very thin. Base smooth; top of whorls with about a dozen smooth spiral lirations or almost entirely smooth (form umbilicalis Broderip and Sowerby). Nucleus glassy smooth. Suture ﬁnely impressed. Color glossy-cream to tan. Aperture pearly. Commonly dredged from 5 to 150 fathoms.

$1/8$ inch in length, 4 to 5 whorls, strong, semi-glossy. Very variable in color (solid purple, whitish with dark-brown variegations and sometimes with a spiral row of dark squares on the periphery), and variable in the number and strength of the small, smooth, spiral cords. Base rounded. Umbilicus narrow but deep. Suture well-impressed. Interior iridescent. Common in shallow water. M. parcipictus Cpr. and obsoletus Cpr. are forms of this species.