. Elements of comparative zoology. Zoology. CCELENTERATA. 173 Order II.—Hexacoralla. As the name indicates, the septa and tentacles here occur in multiples of six. Here belong all the sea-anem- ones and the true corals, which produce coral-reefs and. Fig. 20.—Sea-anemone (Metridium). From Emerton. islands. The reef-building species are limited in their distribution by temperature, for they cannot live where the temperature of the water falls below 60° Fahr. (13° C.). Subclass II.—Scyphomedus^ (Jellyfishes). At first sight the Scyphomedusse differ greatly from the Actinozoa. They are free-swimm
. Elements of comparative zoology. Zoology. CCELENTERATA. 173 Order II.—Hexacoralla. As the name indicates, the septa and tentacles here occur in multiples of six. Here belong all the sea-anem- ones and the true corals, which produce coral-reefs and. Fig. 20.—Sea-anemone (Metridium). From Emerton. islands. The reef-building species are limited in their distribution by temperature, for they cannot live where the temperature of the water falls below 60° Fahr. (13° C.). Subclass II.—Scyphomedus^ (Jellyfishes). At first sight the Scyphomedusse differ greatly from the Actinozoa. They are free-swimming forms (medusae) in which the body is umbrella-shaped, the mouth is at the end of a proboscis, and all is semitransparent, Yet when. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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