. Elements of zoölogy : a textbook. Zoology. Sea-Urchin, Toxopneustes drobachiensis, Ag. Both coasts of the United States, at the North. 7 Top view of Sea-Urchin, spines removed. Shows ambniacral and interanibulacral plates. perforated with a larger hole, through which the eggs are laid. One of these plates is larger than the others, and is filled with very minute holes, and is called by natural- ists the madreporic body. It is believed to serve as a fil- ter to the water which passes through it into the body of the animal. The mouth is in the under side, and is armed with five strong pointed
. Elements of zoölogy : a textbook. Zoology. Sea-Urchin, Toxopneustes drobachiensis, Ag. Both coasts of the United States, at the North. 7 Top view of Sea-Urchin, spines removed. Shows ambniacral and interanibulacral plates. perforated with a larger hole, through which the eggs are laid. One of these plates is larger than the others, and is filled with very minute holes, and is called by natural- ists the madreporic body. It is believed to serve as a fil- ter to the water which passes through it into the body of the animal. The mouth is in the under side, and is armed with five strong pointed and polished teeth, which form the outer part of a remarkable dental apparatus, which is called Aristotle's lantern. In a Sea-urchin of ordinary size there are five or six hundred plates, all fitting together in the most perfect manner, and bearing more than four thousand spines ; and the suckers number about two thousand ! Besides the spines and the suckers, there are scattered over the body and around the mouth of the Sea-urchin a. 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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