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of the shell which project inwards and unite with one another, in the thorax of many Crustacea.

constituting the seventh Linnæn order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders.

A genus of fresh-water phyllopod crustaceans. See Phyllopod.

An interstice or small space, as between the cracks of the surface in certain crustaceous lichens; or as between the fibers composing organs or vessels that interlace; or as between the nervures of an insect's wing.

A genus of copepod Crustacea, parasitic of fishes; a fish louse. See Branchiura.

A genus of small isopod Crustacea that can roll themselves into a ball.

A genus of phyllopod Crustacea found in salt lakes and brines; the brine shrimp. See Brine shrimp.

g all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea. -- Ar*throp"o*dal, a.

One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.

A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See Crawfish.

A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite.

A light or hasty luncheon. Bait bug (Zoöl), a crustacean of the genus Hippa found burrowing in sandy beaches. See Anomura.

A division of the Cetacea, including the right whale and all other whales having the mouth fringed with baleen. See Baleen.

A West Indian sapotaceous tree (Bumelia retusa).

Any cirriped crustacean adhering to rocks, floating timber, ships, etc., esp. (a) the sessile species (genus Balanus and allies), and (b) the stalked or goose barnacles (genus Lepas and allies). See Cirripedia, and Goose barnacle. Barnacle eater (Zoöl.), the orange filefish. -- Barnacle scale (Zoöl.), a bark louse (Ce…

The second joint of the antennæ of crustaceans.

The basal joint of the legs of Crustacea.

ly shore; the strand. Beach flea (Zoöl.), the common name of many species of amphipod Crustacea, of the family Orchestidæ, living on the sea beaches, and leaping like fleas. -- Beach grass (Bot.), a coarse grass (Ammophila arundinacea), growing on the sandy shores of lakes and seas, which, by its interlaced running ro…

Furnished with a process or a mouth like a beak; rostrate. Beaked whale (Zoöl.), a cetacean of the genus Hyperoodon; the bottlehead whale.

The appendages to the jaw in some Cetacea, and to the mouth or jaws of some fishes.