Page:American Seashells (1954).djvu/173

Rh $3/16$ inch in length, turbinate, similar to A. gemma but pure white in color, with scale-like beads, suture more deeply channeled, and with a more rounded periphery. 12 very weak beads bordering the more open umbilicus. The 3 spiral rows of beads on the whorl may be almost smooth in some specimens. Very commonly dredged from 20 to 270 fathoms.

1 to $1 1/2$ inches in length. Color orangish, greenish, brown or grayish, commonly banded with flame-like white spots. Aperture white. Callus on columella heavy. Lower lip projects downward. Operculum calcareous. The form named crenulatus Gmelin is merely less tuberculate.

2 to 3 inches in length. A deep smooth channel runs just below the suture. Surface glossy. 16 to 18 strong, spiral, smooth cords on body whorl. Aperture white. Umbilicus narrow. Operculum pale-brown inside with 3 to 4 whorls, and white, smoothish and convex on the outside. This is the hand- somest Turbo in the Western Atlantic, and considered a great rarity in American waters. Formerly T. spenglerianus Gmelin.

2 to $2 1/2$ inches in width; shell low, almost flat on its underside. Periphery of whorls with strong, flattened, triangular spines. Either with or without an umbilicus. Aperture silvery inside. A form which has an elevated spire and is more spinose (pl. 3m) was known as A. spinulosa Lamarck. Short-spined specimens of this species are often erroneously called