Abstract
The photoreceptors of Arctonoë vittata are rhabdomeric. The retina is formed of pigment and receptor cells. From the distal part of the receptor cell arises a receptoral process that gives rise to lateral microvilli. The microvilli fill the space between the pigment cup and the lens. The receptor cell body and the proximal part of the receptoral process contain melanin in the form of pigment bodies. The pigment cells form a septum 1 μm in diameter, which passes through the rhabdomeric region and then forms a crystalline lens element. The lens consists of a number of such crystalline elements each secreted by a single pigment cell. The pigment bodies of the pigment cells also contain melanin. A marked change in the shape of the lens and an enlargement of the pupil in the eyes of dark-kept animals suggests that the eyes are functional photoreceptors.
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