. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. FIG. 203. — Coral cup of manicina. Nat. size. Photo, by W. H. C. P. hvdroicls, bud freely, and since every bud secretes coral atits base, an extensive and complicated limy mass may beproduced. This is the way in which the brain corals and •6£tt***-.fi-i-^ •*.•>.,- ,. FIG. 204. — Astranyla d<i)ite,a. cluster of our Northern coral-polyps, restingon limy bases of their own secretion. The animals are extremely delicateand transparent. From a lithograph by Louis Agassizs artist Sonrel. branching cor

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. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. FIG. 203. — Coral cup of manicina. Nat. size. Photo, by W. H. C. P. hvdroicls, bud freely, and since every bud secretes coral atits base, an extensive and complicated limy mass may beproduced. This is the way in which the brain corals and •6£tt***-.fi-i-^ •*.•>., - , . FIG. 204. — Astranyla d<i)ite, a. cluster of our Northern coral-polyps, restingon limy bases of their own secretion. The animals are extremely delicateand transparent. From a lithograph by Louis Agassizs artist Sonrel. branching corals are formed. The only coral of the north-eastern United States is Astrangia dance, which occursnorth to Cape Cod. It is a beautifully transparent species, and forms thin encrustations of limy matter (Fig. 204). THE HYDE A AND ITS ALLIES 217 Coral reefs are almost exclusively the product of coralpolyps modified by the environmental conditions. Thereef-building corals live in shallow water from low-watermark to a depth of one hundred feet only. Their dis-tribution along the coast line depends upon the wintertemperature of the sea, since they cannot live at a tem-perature below 20° C. ; consequently reef-building coralsare confined to warm latitudes. However, tropical shoreswhich are washed by arctic currents, such as the westcoasts of Africa and South