Ocelli sentence example

ocelli
  • The ocelli are seen in FIG.
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  • Ocelli are seen at the base of the tentacles, and also (as an exception) groups of medusiform buds.
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  • The sense organs are typically ocelli, never otocysts.
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  • Ocelli, if present, are borne on the tentacle-bulbs.
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  • Above is the crown (vertex or epicranium), on which or on the " front " may be seated three simple eyes (ocelli).
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  • Most insects possess a pair of compound eyes, and many have, in addition, three simple eyes or ocelli on the vertex.
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  • The head is rather large, and is furnished at first with five simple eyes of nearly equal size; but as it increases in size the homologues of the facetted eyes of the imago become larger, whereas those equivalent to the ocelli remain small.
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  • Lateral eyes, when present, represented by separate ocelli.
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  • The broad head carries, in addition to the prominent compound eyes, three simple eyes (ocelli) on the crown, while the feeler consists of a stout basal segment, followed by five slender segments.
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  • The sense-organs of medusae are of two classes: (1) pigment spots, sensitive to light, termed ocelli, which may become elaborated into eye-like structures with lens, retina and vitreous body; (2) organs of the sense of balance or orientation, commonly termed otocysts or statocysts.
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  • The sense-organs are covered over by flaps of the umbrellar margin (hence " Steganophthalmata "), and are always tentaculocysts, that is to say, reduced and modified tentacles, which bear usually both ocelli and otocysts, and are hollow.
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  • The more proximal portion of the rhopalium usually bears one or more ocelli (oc).
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  • As a further advance, the pit becomes widened out into a cup, as in the lateral ocelli of Charybdaea.
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  • The histological structure oc', oc 2, Distal and proximal median of the Scyphomedusae is in ocelli.
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  • The larvae are white, fleshy, apodal grubs, with a series of tubercles along each side of the body; the head is round, and bears strong jaws, and sometimes rudimentary ocelli.
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  • One of the most obvious features is that some feathers end in an apparent eye or ocellus (plural ocelli ).
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  • The ocelli occur usually either on the inner or outer sides of the ten tacles; if on the inner side, the tentacle is turned upwards and t ®Q carried over the ex - umbrella so ®m r s ???.
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  • As has been described above, the endoderm may also contribute to the sense-organs, but such contributions are always of an accessory nature, for instance, concrement-cells in the otocysts, pigment in the ocelli, and never of sensory nature, sense-cells being Hydromedusae are of separate sexes, the only known exception being Amphogona apsteini, one of the Trachomedusae (Browne [9]).
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  • The young are prettily spotted with white and black ocelli, but the coloration of the adult is mostly very plain.
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