. A manual of zoology. PHYLUM CCELENTERATA 127. openings of a pair of canals given off from the enteric cavity. Between the two excretory pores is a remarkable structure, which is the nerve-centre as well as an organ of special sense. The mouth leads into a flattened tube, the gullet, and this again leads into a cavity, the infundibulum, which ad c. \-rm A. Fig. 66.—Hormiphora plumosa. A, transverse section of one of the branches of a tentacle; B, two adhesive cells {ad. c,) and a sensory cell (s. c) highly magni- fied, at, cuticle; >i?t, nucleus. (After Hertwig and Chun.) probably cor
. A manual of zoology. PHYLUM CCELENTERATA 127. openings of a pair of canals given off from the enteric cavity. Between the two excretory pores is a remarkable structure, which is the nerve-centre as well as an organ of special sense. The mouth leads into a flattened tube, the gullet, and this again leads into a cavity, the infundibulum, which ad c. \-rm A. Fig. 66.—Hormiphora plumosa. A, transverse section of one of the branches of a tentacle; B, two adhesive cells {ad. c,) and a sensory cell (s. c) highly magni- fied, at, cuticle; >i?t, nucleus. (After Hertwig and Chun.) probably corresponds to the stomach of the sea-anemone. From this cavity certain canals are given off. Stinging-capsules are not developed, their place being taken by a number of peculiar cells called adhesive ceils, with which the branches of the tentacles are covered. An adhesive cell (Fig. 66, B) has a convex surface, produced into small papillae, which readily adheres to any surface with which it comes in contact, and is with difficulty separated. In the interior of the cell is a spirally coiled filament, the delicate inner end of which can be traced to the rpuscular axis of the tentacular branch. These spiral threads act as springs, and tend to prevent the adhesive cells from being. 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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