. A manual of zoology. PHYLUM MOLLUSCA 283 ficial layer of the shell valves. The megalsesthetes may take the form of eyes, with cornea, lens, pigment layer with iris, and retina. There are two symmetrical nephridia (Fig. 170) opening internally into the pericardium by a ciliated funnel-like opening (n. fieri, afi), and clen. €Z7L Fig. 170. — Chiton, nephridial and genital systems, an, anus; cten, ctenidia; gen. ap, genital aperture; gon, gonad; gouod, gonoduct; mo, mouth; neph. ap, nephridial aperture; ap, aperture from nephridia to pericardium. (From Simroth, after Haller and Lang.) o
. A manual of zoology. PHYLUM MOLLUSCA 283 ficial layer of the shell valves. The megalsesthetes may take the form of eyes, with cornea, lens, pigment layer with iris, and retina. There are two symmetrical nephridia (Fig. 170) opening internally into the pericardium by a ciliated funnel-like opening (n. fieri, afi), and clen. €Z7L Fig. 170. — Chiton, nephridial and genital systems, an, anus; cten, ctenidia; gen. ap, genital aperture; gon, gonad; gouod, gonoduct; mo, mouth; neph. ap, nephridial aperture; ap, aperture from nephridia to pericardium. (From Simroth, after Haller and Lang.) opening on the exterior (jieph. af)y between two of the posterior ctenidia. Each consists of a looped main tube, into which open numerous minute tubules which ramify among the viscera. The sexes are distinct. The testis and ovary {gon) are similar in appearance,. 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 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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