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A genus of Cetacea, including the dolphin. See Dolphin,

The division of Cetacea in which the teeth are developed, including the sperm whale, dolphins, etc.

A columnar cactaceous plant of the West Indies (Cereus Swartzii).

A cetacean of the genus Delphinus and allied genera (esp. D. delphis); the true dolphin.

A genus of cucurbitaceous plants consisting of the single species Ecballium agreste (or Elaterium), the squirting cucumber. Its fruit, when ripe, bursts and violently ejects its seeds, together with a mucilaginous juice, from which elaterium, a powerful cathartic medicine, is prepared.

A group of Crustacea in which the eyes are without stalks; the Arthrostraca. [Written also Edriophthalmata.]

f ejecting or casting out; discharge; expulsion; evacuation. "Vast ejection of ashes." Eustace. "The ejection of a word." Johnson.

An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus.

A genus of extinct Cretaceous fishes; -- so named from their spear-shaped teeth. They were allied to the pike (Esox).

The inner or principal branch of the oral appendages of Crustacea. See Maxilla.

A chitinous structure above the nervous cord in the thorax of certain Crustacea.

The portion of each apodeme developed from the interepimeral membrane in certain crustaceans.

The internal or principal branch of the locomotive appendages of Crustacea. See Maxilliped.

The part of each apodeme derived from the intersternal membrane in Crustacea and insects.

A plate which supports the labrum in certain Crustacea.

One of the subclasses of Crustacea, including a large number of species, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera.

An isopod crustacean, parasitic on shrimps.

In crustaceans: The part of the side of a somite external to the basal joint of each appendage. See Illust. under Crustacea.

A genus of cactaceous plants having flattened, jointed stems, and petals united in a tube. The flowers are very showy, and several species are in cultivation.

The outer branch of the legs in certain Crustacea. See Maxilliped.