It has been shown in the foregoing account that the cavity of the genital sac of Sternaspis communicates with the bodycavity; that the nephridium is provided with a small ciliated funnel, possesses a lumen, and in one region, at all events, is ciliated internally. The complex granules of the nephridial cells have been described in detail; experiments have been recorded as to the solubility in certain reagents of the granules, the cuticle, the ventral shield, and the chsetse. A detailed account of the muscular system has also been given.

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