Abstract
Stacked plates have been found just beneath the epithelium of the siphons of Donax sordidus and Solen capensis. Each stack is 4–8 μm deep and 17–25 μm wide and consists of a number of plates 0.3 μm wide. When viewed with a TEM each plate consists of an electron dense zone (0.1 μm wide), surrounded by a double membrane. It is suggested that these plates serve to reflect or scatter light and are an integral part of the dermal light sensing ability of these animals.
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