268 Avierican Seashells 



Genus Polystira Woodring 1928 

 Poly stir a albida Perry White Giant Turret 



Plate 13I 



South Florida, the Gulf of Mexico and the West Indies. 



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 telle a 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 



Figure 576 



South Florida, the Gulf of Mexico and the West Indies. 



^ 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 



Figure 57) 



Southeast Florida and the West Indies. 



3/ 



4 inch in length; a solid brown-black in color and with a slight sheen. 



