. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1190 TUNICATA. rons, slightly prominent, annular or subellip- tical, without central cavities; the animals (3 to 25) are placed in a single row, at Fin. Siglllina australis. (After A. Vertical section of a cone, or " system," showing the distribution of the animals, •mai/nlfied. ]!. Isolated individual, magnified. C. Natural size of isolated individual. a, test, or external envelope ; b, branchial orifice ; c, anal orifice ; d, thorax ; c, abdomen ; f, oeso- phagus ; g, stomach ; h, intestine ; j, thoraci
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1190 TUNICATA. rons, slightly prominent, annular or subellip- tical, without central cavities; the animals (3 to 25) are placed in a single row, at Fin. Siglllina australis. (After A. Vertical section of a cone, or " system," showing the distribution of the animals, •mai/nlfied. ]!. Isolated individual, magnified. C. Natural size of isolated individual. a, test, or external envelope ; b, branchial orifice ; c, anal orifice ; d, thorax ; c, abdomen ; f, oeso- phagus ; g, stomach ; h, intestine ; j, thoracic sinus ; k, intestinal loop ; /, ovary ; m, oviduct. equal distances from their common centre ; branchial orifice six-rayed ; division of the thorax and abdomen not always distinctly marked. Genus Sidin/um, Savigny. — Common body gelatinous, presenting a series of closely grouped cones, truncated and starred at the summit, rising from a common incrusting base ; each cone composed of a fascicle of indi- viduals, varying in number from five or six to ten or twelve, and forming a margin around a depressed centre. The animals partake of the characters of those of Synoicum and Aplidium, resembling the former in the struc- ture of their stomach, and the latter in their branchial sac. Each has an eight-toothed branchial orifice and a simple tubular vent folded against the thorax. The ovary is pe- duncled, and very conspicuous at the ex- tremity of the animal. (Forbes.) Genus Synoicum, Phipps.*—Common body semicartilaginous, cylindrical, peduucled, iso- lated or attached to similar cylindrical bodies ; system single, circular, comprising six to nine animals, terminal; branchial orifice six- rayed; anal orifice having six very unequal rays, the three largest forming the exterior margin of the central star ; post-abdomen sessile. Genus Amaroucium,Milne-Edwards.—Com- mon body fleshy or coriaceous,polymorphous, subpedunculate or sessile, and incrusting ; systems numerous ; indivi
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