Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY, 105 Fig. 118. Microscopic view of Shell of Pinna. is calcareous, horny, or leathery. This skeleton, called a polypary, or in popular language coral, is secreted by the skin of the animal, and seems to be truly an internal skele- ton. It contains, say ninety-five per cent, of carbonate of lime, some two or three per cent, of fluorides and phosphates, and from four to eight per cent, of organic matter. The Acalephse, another class of Radiates, are mostly gela- tino
Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY, 105 Fig. 118. Microscopic view of Shell of Pinna. is calcareous, horny, or leathery. This skeleton, called a polypary, or in popular language coral, is secreted by the skin of the animal, and seems to be truly an internal skele- ton. It contains, say ninety-five per cent, of carbonate of lime, some two or three per cent, of fluorides and phosphates, and from four to eight per cent, of organic matter. The Acalephse, another class of Radiates, are mostly gela- tinous ; but a few are cartilaginous, and some have a nuclear skeleton. The Echinodermata, with few exceptions, have an Fig. 119.
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