download pdf

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
Massachusetts to Florida, Texas and the West Indies.
Plate i9y
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
Southeast Florida, the West Indies and Bermuda.
Plate 19ZZ
^ 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 pulehella C. B. Adams Beautiful Trifora
Southeast Florida and the \\'est Indies.
Plate 19Z
%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.