File:EB1911 Planarians - Double Eye found on the brain of Polyclads.jpg
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EB1911_Planarians_-_Double_Eye_found_on_the_brain_of_Polyclads.jpg (794 × 442 pixels, file size: 95 KB, MIME type: image/jpeg)
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current | 17:32, 27 December 2018 | 794 × 442 (95 KB) | Bob Burkhardt | {{Information |description ={{en|1=Double Eye found on the brain of Polyclads. Each consists of a pigment-cup and of four nerve-end cells (rod-cells) in which the nerves terminate. Legend: ''N'', nerve fibres and cells. ''Pc'', pigment-cell. ''Rc'', rod cell.}} |date =published 1911 |source =“Planarians,” ''Encyclopædia Britannica'' (11th ed.), v. 21, 1911, p. 710, fig. 3. |author =From ''Cambridge Natural History'', vol ii. “Worms, &c.” After Lang. |permission =... |
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