. A manual of zoology. 128 MANUAL OF ZOOLOGY torn away by the struggles of the captured prey. An allied form is Pleurobrachia, very abundant off our shores. In some of the Ctenophora the body is produced into a pair of lateral lobes. In Beroe, instead of being globular, it is more nearly cylindrical, with an extremely wide mouth and gullet, and without tentacles. In the " Venus's girdle" (Cesfus), it is compressed and almost ribbon-like. All are free-swimming; colonies are never formed ; and there is never any kind of skeleton. The Ctenophora are usually per- fectly transparent, and
. A manual of zoology. 128 MANUAL OF ZOOLOGY torn away by the struggles of the captured prey. An allied form is Pleurobrachia, very abundant off our shores. In some of the Ctenophora the body is produced into a pair of lateral lobes. In Beroe, instead of being globular, it is more nearly cylindrical, with an extremely wide mouth and gullet, and without tentacles. In the " Venus's girdle" (Cesfus), it is compressed and almost ribbon-like. All are free-swimming; colonies are never formed ; and there is never any kind of skeleton. The Ctenophora are usually per- fectly transparent, and quite colour- less, save for delicate tints of red, brown, or yellow on the tentacles or on ridges on the inner surface of the gullet. Cestus has, however, a deli- cate violet hue, and, when irritated, shows a beautiful blue or bluish-green fluorescence ; while Beroe is coloured rose-pink, and Idyia is of a brilliant pink. The most primitive form to be found on our coast is Idyia (Fig. 67), which is a simple oval sphere, the interior of which forms an immense digestive cavity, in which entire large animals may be Fig. 67. — Idyia roseola. Seen from the broad side, half natural size, a, anal opening", /», lateral tube; c, circular tube; d, e, f, g, h, rows of paddles. (After Agassiz.). 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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