Distinguished from the Monodonta by never having the columella truncated
at the base; and from the Trochus by being solid, with the whorls
constantly convex and never flattened. Like the Trochus, when
decorticated, the Turbo exhibits splendid pearly, gold, or silver
irridescent colours.
Shell thick, pearly in the interior; depressed, conical, or
sub-turreted; umbilicated or not, little or not carinated at its
circumference; aperture round or little depressed; the middle of the
external edge not bent, but sometimes hollowed or sloped in some part;
the edges rarely joined by a callosity; the columella arched, rarely
twisted, and not truncated at the base; operculum calcareous or horny;
the spire visible externally in the latter and interiorly in the former;
the exterior often thickened and curved.
Turbo marmoratus.
T. imperialis.
T. torquatus.
T. diaphanus.
T. rugosus.
T. coronatus.
T. sarmaticus.
T. cornutus.
T. argyrastomus.
T. Chrysostomus.
T. radiatus.
T. margaritaceus.
T. setosus.
T. Spenglerianus.
T. petholatus.
T. undulatus.
T. pica.
T. versicolor.
T. smaragdus.
T. cidaris.
T. crenulatus.
T. hippocastanum.
T. muricatus.
T. littoreus.
T. ustulatus.
T. Nicobaricus.
T. neritoides.
T. retusus.
T. rudis.
T. obtusatus.
T. pullus.
T. cærulescens.
T. cancellatus.
T. costatus.
_T. pica._ The Magpie Turbo. Pl. 24, fig. 6.
Species in which the aperture is oblique; the columella losing itself
entirely in its continuation with the margin, the umbilicus always
uncovered; colour black and white.
_T. setosus._ The bristly Turbo.
Thick, transversely and deeply sulcated, longitudinally striated; spire
short, volutions rounded, lip crenulated; inside pearly, variegated with
white, green, and brown.
_T. rugosus._ The rough Turbo.
Species of which the aperture is perfectly round in the direction of the
axis; the operculum horny.