. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. ON VERMICULUS LIMOSUS.^ 105 IX the larger portion of which lies on the dorsal side of the alimentary canal. In segment IX the posterior septum forms on the left ventral side an evagination towards the anterior, and this evagination is directly continued into the sperm- sac, which is very voluminous and is situated on the dorsal side of the intestine, in the median line. Of V. 2*losns Goodrich says (2, p. 261), "The sperma- tozoa are shed at an early stage of development into segment 10, and the anterior septum of this segment
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. ON VERMICULUS LIMOSUS.^ 105 IX the larger portion of which lies on the dorsal side of the alimentary canal. In segment IX the posterior septum forms on the left ventral side an evagination towards the anterior, and this evagination is directly continued into the sperm- sac, which is very voluminous and is situated on the dorsal side of the intestine, in the median line. Of V. 2*losns Goodrich says (2, p. 261), "The sperma- tozoa are shed at an early stage of development into segment 10, and the anterior septum of this segment soon bulges out, forming a sac—the anterior sperm-sac. Later on this sperm-sac pushes its way across segment 9, through its anterior septum into seg- ment 8. The hinder wall of segment 10 also bulges out, forming the posterior ; In the new species before us these two sacs have become one and continuous. The walls of the sperm-sac are exactly like those of the ovisac to be presently described, and arc covered with peritoneal cells onAboth surfaces. The hinder end of the sperm- sac projects into the cavity of the ovisac. 8. Ovary.—One pair attached to the anterior septum of segments X and almost reaching the pos- J). V. Doisal Vessel, int. intesi ine, Cvs. Ovisac, + • , i e n Sep. Septum, 5«. Sperm-sac, Ventral Cord, terIor septum when fully Ventral Vessel. developed, in which case the peritoneal covering is also very indistinct. XI XII XIII xiv. 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 Nihon Do?butsu Gakkai; To?kyo? Do?butsu Gakkai. Tokyo : Societas
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
