. Elementary text-book of zoology. 128 CCELENTERATA. External Features. the body. It is perfectly transparent except for the four gonads which are of a beautiful violet hue. It differs in shape from the medusoids of Obelia, for it is flat, not bell-shaped. However, the general principles of its construction are in many respects similar. It is axially symmetrical and tetramerou?, , the peripheral parts are arranged in fours. The mouth is four-cornered and opens on a short manubrium. It is surrounded by four large oral tentacles which correspond to the four corners of the mouth and are per-r
. Elementary text-book of zoology. 128 CCELENTERATA. External Features. the body. It is perfectly transparent except for the four gonads which are of a beautiful violet hue. It differs in shape from the medusoids of Obelia, for it is flat, not bell-shaped. However, the general principles of its construction are in many respects similar. It is axially symmetrical and tetramerou?, , the peripheral parts are arranged in fours. The mouth is four-cornered and opens on a short manubrium. It is surrounded by four large oral tentacles which correspond to the four corners of the mouth and are per-radial. The disc or umbrella is almost circular but slightly divided Fig. 60.—Oral View of Aurelia Aurita x \. {Ad nat.) Per-radial Canal. Tentaculocyst. Ad-radial Mouth. into eight lobes, the indentations between them being at the four per-radii and the four inter-radii. In each depression or indentation there is situated a sense-organ or tentaculocyst covered by a hood and having a pair of small processes or lappets, one on each side. The whole border of the disc is fringed by a great number of small tentacles and there is no 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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