. An elementary course of practical zoology. Zoology. REPRODtfCTlVE ORGANS 337 â contains the ripe ova, arranged in a single row, each en- closed in a vitelline membrane and con- taining a large nucleus and nucleolus and a number of granules of food-yolk (p. 195). The eggs are discharged into the ccelome and are received into the female gonoducts or oviducts (Fig. 79 , and Fig. 82) â two short tubes, each with a wide ciliated mouth placed opposite the corresponding ovary. The oviduct perforates the next following sep- tum ( that between segments thirteen and fourteen) to open by
. An elementary course of practical zoology. Zoology. REPRODtfCTlVE ORGANS 337 â contains the ripe ova, arranged in a single row, each en- closed in a vitelline membrane and con- taining a large nucleus and nucleolus and a number of granules of food-yolk (p. 195). The eggs are discharged into the ccelome and are received into the female gonoducts or oviducts (Fig. 79 , and Fig. 82) â two short tubes, each with a wide ciliated mouth placed opposite the corresponding ovary. The oviduct perforates the next following sep- tum ( that between segments thirteen and fourteen) to open by a minute aperture on the fourteenth seg- ment, near the inner double row of setae. Connected with the mouth of each oviduct is a small egg-sac (Fig. 79, r. o, Fig. '82, e. s), developed as an out- growth from the same septum and extending back into the cavity of segment fourteen. Pract. Zool. Z. Fig. 82. Diagrammatic longitudinal section o part of a Lzcmbyicus, showing segments 9â15 and the contained generative organs of one side 1X3. In the body-wall the cuticle is indicated by a clear space, the circular muscles by irregular dots, the longitudinal muscles by dotted longitudinal lines, and the peritoneal membrane by a thin line. e. s. egg-sac ; o.'owzxy ; sp. aperture of anterior spermothecaâboth spermothecse are indicated by dotted lines ; sp. s. posterior sperm-sac, the anterior and middle sacs are not lettered ; ss. sperm-sac; /. anterior spermaryâthe posterior is not lettered ; ?. aperture of ovi- duct ; S. aperture of spermiduct. The ovi- duct, spermiduct, and seminal funnels are indicated by thick lines. (From the Cambridge Natural History^ after Hesse.). 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; Parker, William Newton, joint author. London, M
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
