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ocellus |
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ocellus (pl. ocelli): see eye eye, organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many ..... Click the link for more information. . ocellus [ō′sel·əs] (invertebrate zoology) A small, simple invertebrate eye composed of photoreceptor cells and pigment cells. (petrology) A phenocryst in an ocellar rock. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Each ocellus is furnished with its own lid, and the apt can, at will, close as many of the facets of his huge eyes as he chooses. This eye structure seemed remarkable in a beast whose haunts were upon a glaring field of ice and snow, and though I found upon minute examination of several that we killed that each ocellus is furnished with its own lid, and that the animal can at will close as many of the facets of his huge eyes as he chooses, yet I was positive that nature had thus equipped him because much of his life was to be spent in dark, subterranean recesses. |
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