. Natural history of animals. Containing brief descriptions of the animals figured on Tenney's Natural history tablets, but complete without the tablets. Zoology. SEA-URCHINS. 221 minute opening which marks the place of the eye. Alternating with these ocular plates, so called, are five larger plates, each being perforated with a larger hole through which tlie eggs are laid. One of these plates is much larger than the others, and is filled with very minute holes, and is called by naturalists the madre- poric body. It is believed to serve as a filter or strainer to the water which passes through
. Natural history of animals. Containing brief descriptions of the animals figured on Tenney's Natural history tablets, but complete without the tablets. Zoology. SEA-URCHINS. 221 minute opening which marks the place of the eye. Alternating with these ocular plates, so called, are five larger plates, each being perforated with a larger hole through which tlie eggs are laid. One of these plates is much larger than the others, and is filled with very minute holes, and is called by naturalists the madre- poric body. It is believed to serve as a filter or strainer to the water which passes through it into the body of the animal. The mouth, at the under side, 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 hun- dred plates, all fitting together in the most perfect manner, and bearing more than four thousand spines; and the suckers number nearly two thousand! Besides the spines and the suckers, there are scat- tered over the body and around the mouths of Sea- Urchins a great number of curious little organs called Pedieillarioe. They look like a stem ending in a knob, but the knob is com- posed of three pieces or blades, which open and shut tightly, thus form- ing a sort of pincers. The uses of these or- gans are not well un- derstood. The number of kinds of Sea-Urchins is quite large, and they vary in size from an inch to ^g. Northeast three or four inches coast of North 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; Tenney, Abby Amy (Gove) 1836-. New York, Scribner, Armstrong
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1875
