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"The <em>Clavellinidae</em>, or <em>Social Ascidians</em>, are united by means of a sort of creeping stem, which runs along the surface of submarine objects, and gives rise at intervals to short footstalks, at the extremity of which the animals are supported." &mdash; Goodrich, 1859

Social Ascidians

"The Clavellinidae, or Social Ascidians, are united by means of a sort of creeping…

"The colonies of these singular creatues are in the form of a cartilaginous tube, open at one end. In the walls fo this tube, formed by the coalescence of the mantles of the animals composing it, the bodies of the Ascidians are seperately imbedded, the branchial chamber of each passing completely through the wall from its outer to its innner surface." &mdash; Goodrich, 1859

Pyrosoma

"The colonies of these singular creatues are in the form of a cartilaginous tube, open at one end. In…

"Gastrulation of an Ascidian. I. Vesicular Morula of an Ascidian flattened and about to undergo gastrulation. II. Gastrulation effected. fh, cavity of the morula, or blasto-invagination; ch, dd, large blastomeres of the hypoblast, inclosed in small blastomeres of the epiblast." -Whitney, 1911

Sea Squirt Gastrulation

"Gastrulation of an Ascidian. I. Vesicular Morula of an Ascidian flattened and about to undergo gastrulation.…

Diagram of a longitudinal section through a tunicate or ascidian (sea squirt).

Tunicate

Diagram of a longitudinal section through a tunicate or ascidian (sea squirt).