Abstract
The compound eyes of four species of ladybird beetle (Coccinellidae) have been examined with the electron microscope. There are eight retinula cells per ommatidium, and their arrangement is described. Each retinula cell contains, at its distal end, a pair of centrioles aligned in tandem. Extending proximally from the centrioles, and running alongside the rhabdomere, is a transversely striated filamentous structure, comparable with the 'ciliary root' found in other receptor cells, but not previously reported in Arthropod eyes.
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