. Corals and coral islands. Coral reefs and islands; Corals. CORAL-MAKING POLYPS. 45 animal tissue over the outside of the coralluin, excepting at its upper extremity, above this calcareous coating. Another form of a corallum, the secretion of a sinde polyp, is illustrated in the following figure of a species of the Fungia family, so-called in allusion to a resemblance to the mushroom. The long mouth occupied a considerable part of the longitudinal central line. Prom the line at the centre,. CTENACTIS ECHINATA. there is the same radiated arrangement of calcareous septa as in the preceding spec
. Corals and coral islands. Coral reefs and islands; Corals. CORAL-MAKING POLYPS. 45 animal tissue over the outside of the coralluin, excepting at its upper extremity, above this calcareous coating. Another form of a corallum, the secretion of a sinde polyp, is illustrated in the following figure of a species of the Fungia family, so-called in allusion to a resemblance to the mushroom. The long mouth occupied a considerable part of the longitudinal central line. Prom the line at the centre,. CTENACTIS ECHINATA. there is the same radiated arrangement of calcareous septa as in the preceding species, though the animal differs greatly in its extreme shortness in proportion to the breadth. The corals of this group are also peculiar in having the radiated upper surface flat, or nearly so, instead of concave. The fig- ure is a fourth the natural size. These corals, of the genus Fungia, often exceed a foot in length; and thus coral animals are sometimes as large as the largest of Actiniae. Another species of this genus, the Fungia lacera V. (for- merly Fungia echinata D., from the Feejees), is represented as it appears when living (excepting a part left off to suit the page) in the following figure. The coral in the perfect state of the an- imal, is wholly concealed, though often showing the points of the teeth of the septa in consequence of the skin being 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 Dana, James Dwight, 1813-1895. New York : Dodd & Mead
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyo, bookyear1872
