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Floscularia cornuta—Euchlanis triquetra—Melicerta ringens—its powers as brickmaker, architect, and mason—Mode of viewing the Melicerta—Use of glass-cell—Habits of Melicerta—Curious Attitudes—Leave their tubes at death—Carchesium—Epistylis—Their elegant tree forms—A Parasitic Epistylis like the "Old Man of the Sea"—Halteria and its Leaps—Aspidisca Lynceus.

It is of a triangular form, and for that reason was called Trinacria and Triquetra.

The figure known as the triquetra, made by the interlacing of three portions of circles, is also symbolical of the Holy Trinity.

Sicily was anciently called Sicania, Trinâcria, and Triquetra; its three promontories are particularly celebrated in the classic authors; viz.

During the descent we had a fair prospect of the Canarian Triquetra.