. American journal of physiology. rhh. \ 1.^=^ cl. rtnl. ? cl. sn. Ommatidia of Gammarus ornatus after Parker (99). FiGURF, 1. — Longitudinal section of an ommatidium, showing the arrangement of pigmentdue to exposure to bright light. Figure 2. — Transverse section of a retinula from such a preparation as that shown inFig. 1, and taken at the level marked rhb. in that figure. Figure 3. — Longitudinal section of an ommatidium, showing the arrangement of pigmentdue to the absence of light. Figure 4. — Transverse section of a retinula from such a preparation as that shown inFig. 3, and taken near

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. American journal of physiology. rhh. \ 1.^=^ cl. rtnl. ? cl. sn. Ommatidia of Gammarus ornatus after Parker (99). FiGURF, 1. — Longitudinal section of an ommatidium, showing the arrangement of pigmentdue to exposure to bright light. Figure 2. — Transverse section of a retinula from such a preparation as that shown inFig. 1, and taken at the level marked rhb. in that figure. Figure 3. — Longitudinal section of an ommatidium, showing the arrangement of pigmentdue to the absence of light. Figure 4. — Transverse section of a retinula from such a preparation as that shown inFig. 3, and taken near the level marked rhb. in Fig. L Abbreviations: cl. cm.,corneal hypodermis ; cl. rtnl., retinular cell; cl. ace, accessory pigment-cell; con.,cone; cm., corneal cuticula; yZir. «., retinal nerve-fibre; mb. ba., basement mem-brane; nl. rltiL, nucleus of retinular cell; w/. ace, nucleus of accessory pigment-cell;rhb., rhabdome. In an eye of G. ornatus that had been subjected to light forsome six hours (Fig. i), a conside

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