| 21. | The backs of the ears are black, with white spots ( ocelli ).
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| 22. | Giant clams ( Tridacna ) have ocelli that allow light to penetrate their mantles.
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| 23. | These appear to grow in rows which are inserted between existing rows of ocelli.
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| 24. | They also have a swollen forehead, large compound eyes, and three ocelli.
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| 25. | Ocelli are present and form an equilateral triangle.
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| 26. | Their vision relies on various combinations of compound eyes and pigment-pit ocelli.
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| 27. | Its ocelli ( simple eyes ) are well defined and colored a dull yellow.
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| 28. | In some species, there are simple light-sensitive ocelli associated with the brain.
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| 29. | Unlike most primitive insects, the ocelli between the dorsal portions of the compound eyes.
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| 30. | In front of the ocelli is an additional organ that probably functions as a chemoreceptor.
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