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268 Avierican Seashells
Genus Polystira Woodring 1928
Poly stira albida Perry White Giant Turret
South Florida, the Gulf of Mexico and the West Indies.
Plate 13I
3 to 4 inches in length, pure-white in color. P. virgo Lamarck, and
"Wood" are this species. Not uncommonly dredged in the Gulf of Mexico.
Folystira tellea Dall Delicate Giant Turret
Plate 1 3m
Off southeast Florida.
3 to 3% inches in length. Grayish white. Sculpture not so distinct nor
so smooth as in albida. Not uncommonly dredged off Key West. Do not
confuse this and the preceding species with Fiisinus couei (pi. 13d).
Subjamily COCHLESPIRINAE
Shell with a long canal. Sinus on the shoulder, rounded, broad and shal-
low to rather deep. Operculum variable. Radula with 2 strong marginals
and a very large central. Shell thin with a sharply angled periphery.
Genus Ancistrosyrinx Dall 1881
Ancistrosyrifix radiata Dall Common Star Turret
South Florida, the Gulf of Mexico and the West Indies.
Figure 576
^ inch in length. A delicate, glossy, translucent and highly ornamented
species. Anterior canal very long. Shoulders keeled, with numerous, small,
sharp, triangular spines. Commonly dredged from 30 to 170 fathoms.
A. elegans Dall (Elegant Star Turret) from about 200 fathoms off Key
West is 2 inches in length, more elongate, with more numerous and duller
spines on the sharp shoulder. Very rare.
Subfamily CLAVINAE
Shell between Y^ and /4 inch in length, spire tall and the anterior canal
short. Sinus on the shoulder, moderately to deeply U-shaped, often rendered
subtubular by a parietal tubercle. Operculum with an apical nucleus. Radula
variable.
Genus Crassispira Swainson 1840
Crassispira ebenina Dall Dall's Black Turret
Southeast Florida and the West Indies.
Figure 57)
3/ 4 inch in length; a solid brown-black in color and with a slight sheen.