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Millepora alcicornis lives in from 0 to 12 fathoms, and the genera Madrepora and Seriatopora from 0 to 20 fathoms. Mr. SERTULARIA, 40, Cape Horn 66. CELLARIA, 40, Cape Horn 66. CELLARIA, A minute scarlet encrusting species, found living, 190, Keeling Atoll, 12. CELLARIA, An allied, small stony sub-generic form, 48, St Cruz Riv. 50.
Moreover, at Keeling atoll, and probably in many other cases, the different kinds of corals would have to encroach on each other; thus the Nulliporae cannot increase outwards without encroaching on the Porites and Millepora complanata, as is now taking place; nor these latter without encroaching on the strongly branched Madreporet, the Millepora alcicornis, and some Astraeas; nor these again without a foundation being formed for them within the requisite depth, by the accumulation of sediment.
The arming of the lead here invariably came up quite clean, but deeply indented, and chains and anchors which were lowered, in the hopes of tearing up the coral, were broken. Many small fragments, however, of Millepora alcicornis were brought up; and on the arming from an eight-fathom cast, there was a perfect impression of an Astraea, apparently alive.
We shall presently see that there are other organic productions, fitted to bear a somewhat longer exposure to the air and sun. Next, but much inferior in importance to the Porites, is the Millepora complanata.
Of Zoophytes, some presented themselves of the genera Antipathes, Millepora; Cellaria, Flustra two species, Melobesia, Retepora, Acamarchis, Lafoea, Aglaophenia, Dynamena fives species, Clytia four species, and Folliculina, two species.
MILLEPORA, a strong coral with cylindrical branches, of a pink colour, about two inches high, resembling in the form of its orifices M. aspera of Lamarck, 94 and 30, E. Chiloe 43, Tierra del Fuego 53. CORALIUM, 120, Barbary 33 N., Peyssonel in paper read to Royal Society May 1752. ANTIPATHES, 16, Chonos 45.
Little red spots were produced on the tender skin of the arm, which appeared as if they would have formed watery pustules, but did not. M. Quoy mentions this case of the Millepora; and I have heard of stinging corals in the West Indies.
It has been a question with some naturalists, which part of a reef is most favourable to the growth of coral. The great mounds of living Porites and of Millepora round Keeling atoll occur exclusively on the extreme verge of the reef, which is washed by a constant succession of breakers; and living coral nowhere else forms solid masses. Many other facts having a similar tendency might be adduced.
Little red spots were produced on the tender skin of the arm, which appeared as if they would have formed watery pustules, but did not. M. Quoy mentions this case of the Millepora; and I have heard of stinging corals in the West Indies.
Between these plates and in the protected crevices on the reef, a multitude of branching zoophytes and other productions flourish, but the Porites and Millepora alone seem able to resist the fury of the breakers on its upper and outer edge: at the depth of a few fathoms other kinds of stony corals live. Mr.
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