. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. STYELA. 101 position of the mouth in a large anal orifice, fringed with a denticulated margin. The rectal portion is short and not much diminished in calibre. The reproductive organs beset both sides of the mantle, from which they jut prominently into the pallial chamber. In S. tuberosa they are very numerous, and are in the form of irregular, pyriform nodules, of a bright orange colour, distributed without apparent order, excepting that the attenuated end is mostly directed upwards and towards the ventral -y •/ A
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. STYELA. 101 position of the mouth in a large anal orifice, fringed with a denticulated margin. The rectal portion is short and not much diminished in calibre. The reproductive organs beset both sides of the mantle, from which they jut prominently into the pallial chamber. In S. tuberosa they are very numerous, and are in the form of irregular, pyriform nodules, of a bright orange colour, distributed without apparent order, excepting that the attenuated end is mostly directed upwards and towards the ventral -y •/ A — FIG. 60.—Reproductive organs of Styela tuberosa. Magnified. These are the so-called ovaries, but they are reallv ' «/ «/ compound bodies combining both the male and female organs. The centre and larger portion of each is a sac, in the walls of which the ova are developed; and the narrow extremity is produced into a short, nipple- like oviduct, leading directly out of the sac. And firmly attached around the base of each is a series of small, oval vesicles, which are sunk in the substance of the mantle, and which form for each sac a sort of basal cup, within which they rest. These are the male secreting organs, and their ducts, extremely delicate. 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 Alder, Joshua, 1792-1867; Hancock, Albany, 1806-1873; Hopkinson, John, 1844-1919; Norman, Alfred Merle, 1831-1918; Embleton, Dennis, 1810-1900. London, Printed for the Ray society
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Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectseasquirts
