. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 354 IN VEHTEBliA TE MOlirilOLOG Y. The reproductive orguiis are Hitiuited near the dorsal ex- tremity of the visceral hump. The sexes are always sepa- rated iu difl'ereut individuals, there beiug occasionally well- marked difl'erences between the two sexes of the same species, as in ArgomiutK, the feuiale of which possesses a well-devel- oped shell which the male lacks. The ovary (Fig. 157, ov) is single and is enclosed in a capsule (c) formed by the walls of the eute
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 354 IN VEHTEBliA TE MOlirilOLOG Y. The reproductive orguiis are Hitiuited near the dorsal ex- tremity of the visceral hump. The sexes are always sepa- rated iu difl'ereut individuals, there beiug occasionally well- marked difl'erences between the two sexes of the same species, as in ArgomiutK, the feuiale of which possesses a well-devel- oped shell which the male lacks. The ovary (Fig. 157, ov) is single and is enclosed in a capsule (c) formed by the walls of the euterocd'I or viscero-pericardial cavity, into which the organ seems to project, though morphologically it is entirely outside it. The germ-producing region is nearly always the anterior surface of the organ, the stalked ova surrounded by their follicle-cells projecting forward into the capsule, into the cavity of which, into the viscoro-poricardial cavity, tliey burst when mature. In some forms the germ-producing sur- ov. Fig. ir)7.âFkmalk Kki'koductivk Oikians of Treiiwctopiis violnceus (after Hrixk). c -- i-apsuk'. ov = ovary. oil = oviduct. r« = seminal receplacle. og = ovidiical gland. wc = (â (rloiiiic canal. face becomes more hij'hiv folded and more or less dendritic iii form, the area over which the ova are formed brconiiiig thus much greater. The reach the exterior after tliey have passed into the cavity of the cai)sule by means of one or two ci>mplicated ducts {(mI) ojtening into the mantle-cavity. In N<iHt{liis two ducts are ])resent, that of the Ic^ft side, howev«'r, being non-functional, and in the Octopoda and some Decapods, such as UmmdHtrvphi-H, both ducts are present. In other forms but a singh' duct p»!rsists, which, contrary to what occurs iu. 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
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
