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. -- 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.

to California, the fruit of the Rubus Nutkanus. -- Salmon killer (Zoöl.), a stickleback (Gasterosteus cataphractus) of Western North America and Northern Asia. -- Salmon ladder, salmon stair. See Fish ladder, under Fish. -- Salmon peel, a young salmon. -- Salmon pipe, a certain device for catching salmon. Crabb. -…

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.

The European fifteen-spined stickleback (Gasterosteus spinachia); -- called also bismore.

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

Any substance or fluid secreted, or elaborated and emitted, as the gastric juice.

the cells in segmentation or cleavage of the ovum; the cavity of the blastosphere. In the gastrula stage, the segmentation cavity in which the mesoblast is formed lies between the entoblast and ectoblast. See Illust. of Invagination. -- Segmentation nucleus (Biol.), the body formed by fusion of the male and female pro…

ses in a sewing machine. -- Shuttle shell (Zoöl.), any one of numerous species of marine gastropods of the genus Volva, or Radius, having a smooth, spindle- shaped shell prolonged into a channel at each end.

One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata.

Any one of numerous species of limpet-shaped pulmonate gastropods of the genus Siphonaria. They cling to rocks between high and low water marks and have both lunglike organs and gills. -- Si`pho*na"rid, a.

A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group.

An artificial division of gastropods including those that have siphonostomatous shells.

prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.