"The genus Monodonta holds a middle place between Trochus and Turbo, differing from the former in the aperture, and from the latter in the columella, which is arched and truncated at the base. They are all marine shells.
LITORINA.
TURBO.
PHASIANELLA.
"From the well-known genus Turbo, a new one has been formed, called Litorina, which includes all the shells of our own coasts that formerly ranked under Turbo. Consequently we find the periwincle has changed its generic name, and from Turbo it is altered into Litorina. T. muricata is now of the same new genus, Litorina muricata. ([Plate 7.])
"Turbo pica is a large pearly shell known as the magpie. The golden-mouthed Turbo is very brilliant; the aperture appears as if gilded, so fine is the yellow tint. It comes from the Molucca Isles. Turbo smaragdus, from New Zealand, is a rare and beautiful species of a bright green colour.
"Phasianella is a beautiful genus of shells, formerly very costly. A small but elegant species is found on our own shores, P. pullus, Turbo pullus of some authors. The colour is pink.
"Phasianella bulimoides, from New Holland, is the largest of the species, and once a very rare shell.
"The term Turritella will give you an idea of the form of our last genus in the family Turbinacea. The shells are like little towers, with a circular aperture. The older conchologists gave the name of screw to all turreted shells, without attending to the form of the aperture. Hence we find screws among Turbo, Buccinum, and Strombus (spindle).
TURRITELLA.