. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Development by buds of Laguncula repens. 1. A young bud, with the cavity of the stalk ex- tending into it, the parietes thickened at one part; it is from this part that the intestinal canal and tentacles are formed. 2. A sac is formed in the interior, having a longi- tudinal fold, which afterwards becomes the tentacles. 3. The rudiments of the tentacles are here appa- rent : the view is taken so that the space which they surround is visible. 4. In this figure all the organs of the animal can be distinguished, but the bud
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Development by buds of Laguncula repens. 1. A young bud, with the cavity of the stalk ex- tending into it, the parietes thickened at one part; it is from this part that the intestinal canal and tentacles are formed. 2. A sac is formed in the interior, having a longi- tudinal fold, which afterwards becomes the tentacles. 3. The rudiments of the tentacles are here appa- rent : the view is taken so that the space which they surround is visible. 4. In this figure all the organs of the animal can be distinguished, but the bud is not yet opened. 5. Here the cell is opened, and the animal is ready to expand itself. 6. Section of the adult animal; a, tentacles; b, mouth; c, buccal cavity; d, valve separating this cavity from the oesophagus; e, oesophagus ; f, sto- mach ; g, pyloric cilia; h, pyloric valve; i, intes- tine ; k, anus ; /, peri-intestinal cavity ; m, commu- nication of this cavity with the interior of the ten- tacles ; n, nervous ganglion; o, long retractor muscle ; p, retractor of the stomach ; q, walls of the cell, (After Van Beneden.) The second cavity, which is the intestinal, has as yet no communication with the ex- ternal world. As the formation of the ten- tacula proceeds, the portion which is situated in front of them will become the sheath, and the otlier part the proper intestinal canal; the former cavity is, therefore, in all respects comparable to that which exists in the Tuni- cata situated in front of the proper oral orifice and lined with the branchial vessels. The tentacles of these polypes, in fact, if connected by transverse canals and attached to the sheath, would transform the animals in this phasis of their growth into Ascidians. As the tentacula are formed by the pro- longation of the tubercles which were their first rudiments, the cavity of the stomach and the rest of the intestinal tube gradually be- come apparent, and at the same time some globules are visible di
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