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A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.

A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.

An extensive division, or sub-class, of hermaphrodite gastropods, in which the mantle cavity is modified into an air- breathing organ, as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnæa and Planorbis.

A genus of marine gastropods, usually having a rough and thick shell. Some species yield a purple dye.

ng, or connected with, a purple-colored secretion; as, the purpuriparous gland of certain gastropods.

A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

A divisiom of gastropods; the Pectinibranchiata.

A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append.

A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.

Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidæ, found both in fresh and salt water.

. -- River pirate (Zoöl.), the pike. -- River snail (Zoöl.), any species of fresh-water gastropods of Paludina, Melontho, and allied genera. See Pond snail, under Pond. -- River tortoise (Zoöl.), any one of numerous fresh-water tortoises inhabiting rivers, especially those of the genus Trionyx and allied genera. See…

y circulated in Ireland in the 13th century for a penny. Rosary shell (Zoöl.), any marine gastropod shell of the genus Monodonta. They are top-shaped, bright-colored and pearly.

A division of pectinibranchiate gastropods, having the head prolonged into a snout which is not retractile.

The snout of a gastropod mollusk. See Illust. of Littorina.

Any one of numerous species of small, polished, brightcolored gastropods of the genus Rotella, native of tropical seas.

eries of large egg capsules, or oöthecæ, of any one of several species of American marine gastropods of the genus Fulgur. See Oötheca. Ruffle of a boot, the top turned down, and scalloped or plaited. Halliwell.

Any one of numerous species of marine gastropods of the genus Scalaria, or family Scalaridæ, having elongated spiral turreted shells, with rounded whorls, usually crossed by ribs or varices. The color is generally white or pale. Called also ladder shell, and wentletrap. See Ptenoglossa, and Wentletrap.…

so, a steam vessel propelled by a screw. -- Screw shell (Zoöl.), a long, slender, spiral gastropod shell, especially of the genus Turritella and allied genera. See Turritella. -- Screw steamer, a steamship propelled by a screw. -- Screw thread, the spiral which forms a screw. -- Screw stone (Paleon.), the fossil st…

An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

Any small creeping marine gastropod, as the species of Littorina, Natica, etc.