TRIPHORIDAE 159 



cords or threads. Axial sculpture of weak, obsolete or sometimes strong, very 

 tiny, rounded riblets. A. t. diegeiisis Bartsch is a strongly sculptured form 

 of this species. 



Family TRIPHORIDAE 

 Genus Triphora Blainville 1828 



Shell left-handed (sinistral), very small, and slender. Aperture subcir- 

 cular. Siphonal canal short, curved backward, slightly emarginate, upper 

 part almost or completely closed. Posterior canal very slightly developed. 

 Sculpture of spiral rows of neat beads, often joined by axial threads. 



Triphora nigrocincta C. B. Adams Black-lined Trifora 



Plate i9y 



Massachusetts to Florida, Texas and the West Indies. 



Vs ^o Vi inch in length, left-handed, with lo to 12 slightly convex 

 whorls; dark chestnut-brown with 3 spiral rows of prominent, grayish, glossy 

 beads. Darker band of black-brown is just below the suture. Aperture and 

 columella brown. A common species found on seaweed at low tide. Some- 

 times considered a subspecies of perversa from Europe. 



Triphora decorata C. B. Adams Mottled Trifora 



Plate 19ZZ 



Southeast Florida, the West Indies and Bermuda. 



^ inch in length, left-handed, with about 20 flat-sided whorls which 

 bear 3 spiral rows of large beads (28 per row per whorl). Color of shell 

 cream to gray with large, irregular maculations of reddish brown. Moderately 

 common from i to 40 fathoms. T. ornata Deshayes from the same area is 

 very similar, but half as large, the spire slightly concave instead of being flat. 



Triphora pule hell a C. B. Adams Beautiful Trifora 



Plate 19Z 



Southeast Florida and the \\'est Indies. 



%6 inch in length, left-handed, spire slightly convex; 15 whorls slightly 

 convex, and with 3 spiral rows of beads which are joined axially and spirally 

 by small, low, smooth threads. Suture well-indented. Upper third of whorl, 

 including beads, colored light-brown, lower two thirds white. Uncommon 

 in shallow water down to 56 fathoms. 



Triphora pedroajja Bartsch San Pedro Trifora 



Redondo Beach, California, to Lower California. 



