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. 5. Planaxis. Two species. Shell marine, generally small, solid, of an oval conical form, oblong, a little sloping in front; columella flattened and truncated anteriorly; right margin furrowed or radiated within, and thickened by a callosity running to its origin; operculum oval, thin, horny, and sub-spiral. Planaxis sulcata. Planaxis undulata. _P. sulcata._ The furrowed Planaxis. Pl. 27, fig. 4. Imperforate, furrowed transversely; outer lip crenulated and striated internally; colour grayish white, spotted with black, forming oblique longitudinal bands. 6. Phasianella. The Pheasant Snail. Ten species. This genus of shells is celebrated for the beauty and variety of the colouring, disposed in such a manner as to resemble the plumage of a pheasant. They are marine shells, many of which are rare and valuable; they possess a very distinctive character, that of a slightly projecting angle running along the columella.