. Text-book of zoology for schools and colleges. Zoology. 86 INVERTEBRATE ANIMALS. secrete a calcareous or homy skeleton or framework which is known as the " coral" or " ; The are divided into four orders—viz., the Zoan- tharia, the Alcyonaria, the Mugosa, and the Ctenophora. Oedee I. ZoAifTHAEiA (Gr. zovn, animal; anthos, flower). —The Zoantharia comprise those Actinozoa in which the pol3rpes are furnished with smooth, simple, usually numerous tentacles, which, like the mesenteries, are in multiples of five or six. The Zoantharia are divided into three g
. Text-book of zoology for schools and colleges. Zoology. 86 INVERTEBRATE ANIMALS. secrete a calcareous or homy skeleton or framework which is known as the " coral" or " ; The are divided into four orders—viz., the Zoan- tharia, the Alcyonaria, the Mugosa, and the Ctenophora. Oedee I. ZoAifTHAEiA (Gr. zovn, animal; anthos, flower). —The Zoantharia comprise those Actinozoa in which the pol3rpes are furnished with smooth, simple, usually numerous tentacles, which, like the mesenteries, are in multiples of five or six. The Zoantharia are divided into three groups, dis- tinguished from one another by the presence or absence of a coral, and by its structure when present. The first of these groups is termed Zoantharia malacoder- mata, or " soft-skinned " Zoantharia, because the polypes are either wholly destitute of a coral, or, if there is one, it consists merely of little scattered needles or spicules of carbonate of lime. Generally, too, the organism is simple, and consists of. Fig. 26.—^Morphology of AcilnidcR. rosea; h Arachnactis a^fti^a(afterGosse).. no more than a single polype. The best known of the mem- bers of this group are the beautiful sea-anemones or animalr flowers {ActinidcB), which occur so plentifully on every coast (Fig. 26, a). It will be as well to describe the structure of a sea-anemone somewhat in detail, as in this way a clear notion may be obtained of the general anatomy of the Actinozoa. The body of an ordinary sea-anemone (Fig. 36, a) is a truncated cone or short cylinder, termed the " column," and is of a soft, leathery consistence. The two ends of the column are termed. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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