. Corals and coral islands. Coral reefs and islands; Corals. 42 CORALS AND CORAL ISLANDS. II. CORAL-MAKIjSG ACTINOID POLYPS. Of the form, tentacles, mouth, stomach, fleshy septa, lasso- cells, food, digestion and respiration of the coral-making polyps here included, nothing need here be said, these characters being the same as in the Actiniae. Their more striking peculiarities depend on the secretion of coral, making them fixed species, and involving an absence of the base; and, in the case of the majority of the species, on the extent to which they multiply by buds, in imitation of species in
. Corals and coral islands. Coral reefs and islands; Corals. 42 CORALS AND CORAL ISLANDS. II. CORAL-MAKIjSG ACTINOID POLYPS. Of the form, tentacles, mouth, stomach, fleshy septa, lasso- cells, food, digestion and respiration of the coral-making polyps here included, nothing need here be said, these characters being the same as in the Actiniae. Their more striking peculiarities depend on the secretion of coral, making them fixed species, and involving an absence of the base; and, in the case of the majority of the species, on the extent to which they multiply by buds, in imitation of species in the vegetable kingdom. The coral skeleton which the secretions of polyps form is called the corallum. These secretions take place among the tis-. CARYOPHYLLIA CYATHUS. sues of the sides and lower part of the polyp, but never in the disk or stomach, as this would interfere with the functions of these organs. In the above sketches of a simple coral, from the Mediterranean, the upper extremity is a depression, or calicle^ enclosed by a series of radiating calcareous (coral). 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
Size: 1990px × 1256px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyo, bookyear1874
