. A manual of zoology. 196 MANUAL OF ZOOLOGY (Fig. in) consists of a darkly pigmented cup, the retina {re), with a small rounded aperture, the pupil, and enclosing a mass of gelatinous matter, the lens (/).. Fig. III. — Section through an eye of Nereis, co, cornea; cu, cuticle; /, lens; r, layer of rods; re, retina. (After Andrews.) The organs which are supposed to perform the function of excretion are a series of metamerically arranged pairs of internally ciliated tubes, the segmental organs or nephridia (Figs. 109 and no, nepli) occurring in all the segments of the body. Each of these has an

- Image ID: PG4097
. A manual of zoology. 196 MANUAL OF ZOOLOGY (Fig. in) consists of a darkly pigmented cup, the retina {re), with a small rounded aperture, the pupil, and enclosing a mass of gelatinous matter, the lens (/).. Fig. III. — Section through an eye of Nereis, co, cornea; cu, cuticle; /, lens; r, layer of rods; re, retina. (After Andrews.) The organs which are supposed to perform the function of excretion are a series of metamerically arranged pairs of internally ciliated tubes, the segmental organs or nephridia (Figs. 109 and no, nepli) occurring in all the segments of the body. Each of these has an
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Image ID: PG4097
. A manual of zoology. 196 MANUAL OF ZOOLOGY (Fig. in) consists of a darkly pigmented cup, the retina {re), with a small rounded aperture, the pupil, and enclosing a mass of gelatinous matter, the lens (/).. Fig. III. — Section through an eye of Nereis, co, cornea; cu, cuticle; /, lens; r, layer of rods; re, retina. (After Andrews.) The organs which are supposed to perform the function of excretion are a series of metamerically arranged pairs of internally ciliated tubes, the segmental organs or nephridia (Figs. 109 and no, nepli) occurring in all the segments of the body. Each of these has an external opening or nephri- diopore, a fine circular pore capable of being widened or contracted, situated on the ventral surface not far from the base of the ventral cirrus, and opening internally into the ccelom through a ciliated bell or funnel, the nephrostome, projecting through the mesentery into the cavity of the seg- ment next in front of that in which the body of the organ lies.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.

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