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A division of fishes including the mackerels, tunnies, and allied fishes.

(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 stem of an encrinite. -- Screw tree (Bot.), any plant of…

urvy, and has proved a valuable food to arctic explorers. The name is given also to other allied species of plants.

Any crustacean of the genus Palinurus and allied genera, as the European spiny lobster (P. vulgaris), which is much used as an article of food. See Lobster.

Any one of several species of fish-eating eagles of the genus Haliæetus and allied genera, as the North Pacific sea eagle. (H. pelagicus), which has white shoulders, head, rump, and tail; the European white-tailed eagle (H. albicilla); and the Indian white- tailed sea eagle, or fishing eagle (Polioaëtus ichthyaëtus). T…

Any one of several species of nudibranchiate mollusks of the genus Doris and allied genera, having a smooth, thick, convex yellow body.

Any one of numerous species of isopod crustaceans of Cymothoa, Livoneca, and allied genera, mostly parasites on fishes.

Any bryozoan of the genus Flustra or allied genera which form frondlike corals.

A dorsibranchiate annelid, belonging to Aphrodite and allied genera, having long, slender, hairlike setæ on the sides.

nd in the North Pacific Ocean. Its fur is highly valued, especially by the Chinese. It is allied to the common otter, but is larger, with feet more decidedly webbed. Sea-otter's cabbage (Bot.), a gigantic kelp of the Pacific Ocean (Nereocystis Lutkeana). See Nereocystis.

Any fish of the genus Diodon, and allied genera, whose body is covered with spines. See Illust. under Diodon.

An American cottoid fish (Hemitripterus Americanus) allied to the sculpins, found on the northeren Atlantic coasts.

Sensitive plant. (Bot.) (a) A leguminous plant (Mimosa pudica, or M. sensitiva, and other allied species), the leaves of which close at the slightest touch. (b) Any plant showing motions after irritation, as the sensitive brier (Schrankia) of the Southern States, two common American species of Cassia (C. nictitans, and…

Appearing or blossoming later in the season than is customary with allied species.

Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidæ. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an o…

s species of long-winged oceanic birds of the genus Puffinus and related genera. They are allied to the petrels, but are larger. The Manx shearwater (P. Anglorum), the dusky shearwater (P. obscurus), and the greater shearwater (P. major), are well-known species of the North Atlantic. See Hagdon.

A European siluroid fish (Silurus glanis) allied to the cat- fishes. It is the largest fresh-water fish of Europe, sometimes becoming six feet or more in length. See Siluroid.

Any one of several species of large Old World ducks of the genus Tadorna and allied genera, especially the European and Asiatic species. (T. cornuta, or tadorna), which somewhat resembles a goose in form and habit, but breeds in burrows.

Any long, slender, worm-shaped bivalve mollusk of Teredo and allied genera. The shipworms burrow in wood, and are destructive to wooden ships, piles of wharves, etc. See Teredo.

A large African wading bird (Balæniceps rex) allied to the storks and herons, and remarkable for its enormous broad swollen bill. It inhabits the valley of the White Nile. See Illust. (l.) of Beak.