. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). tss. 498 INVERTEBRATE MORPHOLOO Y. from these various portions on each side unite to form a vas deferens which may dilate into a vesicula seminalis and then, uniting with its fellow of the opposite side, forms the ductus eJHCulatorius. Occasionally the vesicula is unpaired arising from the point of union of the two vasa deferentia, and very frequently accessory glands occur. The ductus ejaculatorius opens usually on the ventral surface of the tenth abdominal segment, an
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). tss. 498 INVERTEBRATE MORPHOLOO Y. from these various portions on each side unite to form a vas deferens which may dilate into a vesicula seminalis and then, uniting with its fellow of the opposite side, forms the ductus eJHCulatorius. Occasionally the vesicula is unpaired arising from the point of union of the two vasa deferentia, and very frequently accessory glands occur. The ductus ejaculatorius opens usually on the ventral surface of the tenth abdominal segment, and projections of the body-wall in the vicinity of the orifice form a groove or tube through which the sperma- tozoa, usually united into spermatophores, are introduced into the bursa copulatrix of the female. Parthenogenesis occurs as a normal process in certain Insects, though always associated with true sexual reproduc-. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
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