. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. 88 BRITISH TUN1GATA. nine on each side of the folds and four between them. The tentacular filaments are pinnate, of nearly equal size, and number twenty-four or twenty-five. The branchial tubercle (PL XLVIII, fig. 6) is large, trans- versely oval, and strongly convoluted, the convolutions being directed upwards. The oral lamina (PI. XL, fig. 8) is broken up into about twenty-five tentacular processes which are attenuated, sharp at the points, and much inflated at the base, and are supported on a narrow membranous ridge. Th
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. 88 BRITISH TUN1GATA. nine on each side of the folds and four between them. The tentacular filaments are pinnate, of nearly equal size, and number twenty-four or twenty-five. The branchial tubercle (PL XLVIII, fig. 6) is large, trans- versely oval, and strongly convoluted, the convolutions being directed upwards. The oral lamina (PI. XL, fig. 8) is broken up into about twenty-five tentacular processes which are attenuated, sharp at the points, and much inflated at the base, and are supported on a narrow membranous ridge. The alimentary canal (PL XXXIII, fig. 3) forms a single open loop which extends from the bottom of the pallial sac for more than two-thirds the length of FIG. 55. FIG. - I _, c< ' . FIG. 55.—The liver in Cynthia ovata. FIG. 56.—The liver in Cynthia morus. Magnified. the endostyle; the calibre of the tube is pretty-equal throughout, the stomach being scarcely distinguishable. The liver (PL XXXIII, fig. ^3 and fig. 56 in text) is well developed and is composed of three or four lobed masses, which when in a fresh state are of an orange colour, but when preserved in spirit are of a pale greenish yellow; the masses are made up of dense dendritic tufts, the extremities of the branches of which, extending upwards, give to the surface of the organ a minutely - papillose appearance; in this branched and dendritic structure the organ is very similar to that of many of the Brachiopods. The reproductive organs (PL XXXIII, figs. 3-5) are rather voluminous, and are composed of congeries. 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
