. A manual of zoology. I IS MANUAL OF ZOOLOGY features of the two sub-classes are, that in the Zoantharia the tentacles and mesenteries are usually very numerous, and are arranged, as a rule, in multiples of five or six, and. Fig. 56. — The common Sea-anemone. (After Emerton.) Fig. 57. — Corallium rubrum, portion of colony. Enlarged twice. (After Lacaze- Duthiers.) that the tentacles are simple in form; while in the Alcyo- naria (Fig. 58) the tentacles and mesenteries are always eight in number, and the tentacles are pinnate, , each of them consists of a main stem with two rows of lateral
. A manual of zoology. I IS MANUAL OF ZOOLOGY features of the two sub-classes are, that in the Zoantharia the tentacles and mesenteries are usually very numerous, and are arranged, as a rule, in multiples of five or six, and. Fig. 56. — The common Sea-anemone. (After Emerton.) Fig. 57. — Corallium rubrum, portion of colony. Enlarged twice. (After Lacaze- Duthiers.) that the tentacles are simple in form; while in the Alcyo- naria (Fig. 58) the tentacles and mesenteries are always eight in number, and the tentacles are pinnate, , each of them consists of a main stem with two rows of lateral branchlets. Only the sea-anemones (with a few exceptions) and a few Madrepore corals remain simple, the rest all giving rise to more or less extensive colonies, of a variety of differ- ent forms, by continuous budding. The structure of the zooids is similar to that of the sea-anemone in all essential respects. In many of the Alcyonaria two forms of zooids are to be distinguished in each colony {dimorphism of the zooids), ordinary zooids, and siphonozooids, which are smaller, and are devoid of tentacles and of 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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