Zoology: Being a Systematic Account of the General Structure, Habits ...
Zoology: Being a Systematic Account of the General Structure, Habits ...
William Benjamin Carpenter, (
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The same t kes place in the early development of the gemmules. Moreover, if a piece of this flesh be stripped from the surface and placed in sea-water, it will begin to form a cell, by the deposition of calcareous mat ter, upon the spot where it happens to rest ; and this cell is soon tenanted by a Poljrpe like an Actinia. Many other arborescent forms of lamelliform corals might be enumerated^ which are of great beauty to the common observer, and highly interesting to the Naturalist on account ...of their affinity with the extinct species so abundant in limestone rocks.* Amongst these are the true Madreporefy in which the whole surface of the stem and branches is covered with minute cells. In all these, as in the plant-like Sertularuke (§ 1177), the living flesh is withdrawn from the lower part, in proportion to the extent of growth above ; and, if attached to a limestone rock, the root can scarcely be distin- guished from the basis on which it has been implanted. 1137. We now pass to another series of forms presented by the lithophyte corals ; — those in which the Polype-cells, instead of being placed on the ends or sides of branches, are distributed over a continued surface, sometimes in close apposition with each other, sometimes widely separated, but united by a solid calcareous mass which fills up the interspaces* Of the first of these kinds, the common Astraa aflbrds an exceUent example.
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