. A manual of zoology. PHYLUM NEMATHELMINTHES <53 and giving off six nerves forwards and six backwards (Fig. 83). Of the latter, two are of a considerable size and run in the dorsal and ven- tral lines respectively {din, vlri). The reproductive organs are formed on a peculiar and very characteristic pat- tern. The testis (Fig. 84, is) is a long coiled thread, occupying a considerable portion of the body-cavity. At its posterior end it is continuous with the vas deferens. The vas deferens, in its turn, becomes con- tinuous with a wide canal, the vesicula seminalis (vs. sent), which opens by
. A manual of zoology. PHYLUM NEMATHELMINTHES <53 and giving off six nerves forwards and six backwards (Fig. 83). Of the latter, two are of a considerable size and run in the dorsal and ven- tral lines respectively {din, vlri). The reproductive organs are formed on a peculiar and very characteristic pat- tern. The testis (Fig. 84, is) is a long coiled thread, occupying a considerable portion of the body-cavity. At its posterior end it is continuous with the vas deferens. The vas deferens, in its turn, becomes con- tinuous with a wide canal, the vesicula seminalis (vs. sent), which opens by a short, narrow, muscular tube, the ductus cjaculato- rins, into the rectum. Be- hind the rectum, and open- ing into its dorsal wall, are paired muscular sacs (s) containing the penial seta (p. ns) already noticed. The anterior end of the testis consists of a solid mass of sexual cells ; pass- ing backwards there is found a cord or rachis occupying the axis of the tube and. 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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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900
