. Zoology for high schools and colleges. Zoology. Fig. 78.—The common Sea-urchin, Echinus (Strongylocentrotus) drobachiensls. d, frame-work of mouth and teeth seen in front; c, the same seen sideways; o, b, side and external view of a eingle tooth (pyramid); all natural size.—After Morse. States, Northern Europe, and the Arctic Seas. It is com- mon among rocks, ranging from low-water mark to fifty or more fathoms. It eats sea-weeds, and is also a scavenger, feeding on dead fish, etc. We have observed great num- bers of them assembled in large groups, feeding on fish ofEal, a few fathoms below
. Zoology for high schools and colleges. Zoology. Fig. 78.—The common Sea-urchin, Echinus (Strongylocentrotus) drobachiensls. d, frame-work of mouth and teeth seen in front; c, the same seen sideways; o, b, side and external view of a eingle tooth (pyramid); all natural size.—After Morse. States, Northern Europe, and the Arctic Seas. It is com- mon among rocks, ranging from low-water mark to fifty or more fathoms. It eats sea-weeds, and is also a scavenger, feeding on dead fish, etc. We have observed great num- bers of them assembled in large groups, feeding on fish ofEal, a few fathoms below the sur- face, in a harbor on the coast of Labrador, where fishing- vessels were anchored. On placing an Echinus in sea-water the movements of the animal, especially its mode of drawing itself along by its numerous long tenta- cles or ambulacral feet, and how it covers itself by draw- ing together bits of sea- weed and gravel, may be observed. A habit less easily detected is thab of some sea-urchins burrowing in limestone rocks and coral reefs until the ani- mal sinks quite far down. How the rock becomes thus worn away, unless simply by the rotary movements of the body, is not clearly Fig. 79.—Tooth-apparatus of the Sea- nrchm, showing the complicated arrange- ment of the muscles.—From 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York, H. Holt and Company
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