Search the Dictionary

One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj.

The structure which unites together the ascidiozooids in a compound ascidian.

Shaped like an ascidian.

One of the individual members of a compound ascidian. See Ascidioidea.

A genus of simple ascidians, which formerly included most of the known species. It is sometimes used as a name for the Ascidioidea, or for all the Tunicata.

A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.

A fold of the endoderm, which projects into the blood cavity of ascidians. See Tunicata.

Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

A beautiful American ascidian (Cynthia, or Halocynthia, pyriformis) having the size, form, velvety surface, and color of a ripe peach.

A pedunculated ascidian of the genus Boltonia.

An American compound ascidian (Amoræcium stellatum) which forms large whitish masses resembling salt pork.

An ascidian. See Illust. under Tunicata.

Consisting of a single individual or zooid; as, a simple ascidian; -- opposed to compound. Simple contract (Law), any contract, whether verbal or written, which is not of record or under seal. J. W. Smith. Chitty. -- Simple equation (Alg.), an eqyation containing but one unknown quantity, and that quantity only in the…

ng compound groups or colonies by budding from basal processes or stolons; as, the social ascidians. Social science, the science of all that relates to the social condition, the relations and institutions which are involved in man's existence and his well- being as a member of an organized community; sociology. It conc…

One of the apertures of the gill of an ascidian, and of Amphioxus.

y the stolons. Such stolons are often present in Anthozoa, Hydroidea, Bryozoa, and social ascidians. See Illust. under Scyphistoma.

ich are imbedded in, or scattered over, the surface of the common tissue of many compound ascidians. Block system, Conservative system, etc. See under Block, Conservative, etc.

A division of Tunicata including the common attached ascidians, both simple and compound. Called also Tethioidea.

The central axis or cord in the tail of larval ascidians and of certain adult tunicates. [Written also urocord.]