. Zoology : for students and general readers . Zoology. STRUCTURE OF APPENDICULARIA. 199 body-cavity which lies between the end of the intestine and the atrial or excurrent orifice ; into this atrial region the faeces, eggs, etc., pass on tlieir way to and out of the atrial orifice. The simplest form of Tunicate is Appenclicularia, which is tadpole-shaped, bearing a general resemblance to the larva of an ordinary Ascidian, so that it may be properly called a larval form. The Appendicularia is a pelagic animal, usually about a quarter of an inch in length, found floating at or near the surface
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. Zoology : for students and general readers . Zoology. STRUCTURE OF APPENDICULARIA. 199 body-cavity which lies between the end of the intestine and the atrial or excurrent orifice ; into this atrial region the faeces, eggs, etc., pass on tlieir way to and out of the atrial orifice. The simplest form of Tunicate is Appenclicularia, which is tadpole-shaped, bearing a general resemblance to the larva of an ordinary Ascidian, so that it may be properly called a larval form. The Appendicularia is a pelagic animal, usually about a quarter of an inch in length, found floating at or near the surface when the ocean is calm, and occurring in all seas a few miles from land or in mid-ocean. It swims by means of its large, long, broad, flat tail, the body being. Fig. 186.—Anatomy of Boltenia.—Drawn by J. S. Kingaley from the author's dissections. oval or flaak-shaped. In Appendicularia flahellum, as de- scribed by Huxley, the caudal appendage is three or four times as long as the body. The mouth leads into a large pharyngeal or branchial sac ; a narrow resophagus at the bottom of this sac leads to a spacious stomach, with two lobes, from the left one of whicli the intestine arises, curves and ends midway between the mouth and insertion of the tail. In the middle of the hsemal side (that side in which the heart is situated and bearing the atrial opening) is a fold of the wall of the pharyngeal cavity called the endoshjle. On each side of this endostyle are two oval ciliated apertures.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt