Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 C(ELENTERATA. 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 *^^^™f^-\£^3 ffj&%%%%%%%%%%%%%%%%s&*%%%%%%%%%%%%%%%%«sA ^!^?JTO 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,)

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Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 C(ELENTERATA. 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 *^^^™f^-\£^3 ffj&%%%%%%%%%%%%%%%%s&*%%%%%%%%%%%%%%%%«sA ^!^?JTO 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/E (Jelly-fishes). At first sight the Scyphomedusse differ greatly from the Actinozoa. They are free-swimming forms (medusa?) in which the body is umbrella-shaped, the mouth is at the end of a proboscis, and all is semitransparent. Yet when

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