. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. 102 BRITISH TUN1CATA. tubes, frequently united in pairs, pass upwards over the surface of the ovigerous sac, and go to join, on the median line, a slender vas deferens, which, passing forward, terminates at the extremity of the oviduct. There are thus as many oviducts and outlets for the male secretion as there are compound reproductive masses, and the eggs must be shed everywhere into the atrial space between the branchial sac and the wall of the pallia! chamber, and afterwards carried by the atrial currents to the cloaca
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. 102 BRITISH TUN1CATA. tubes, frequently united in pairs, pass upwards over the surface of the ovigerous sac, and go to join, on the median line, a slender vas deferens, which, passing forward, terminates at the extremity of the oviduct. There are thus as many oviducts and outlets for the male secretion as there are compound reproductive masses, and the eggs must be shed everywhere into the atrial space between the branchial sac and the wall of the pallia! chamber, and afterwards carried by the atrial currents to the cloaca, whence they pass out as usual by the excurrent tube. Besides the reproductive masses other very similarly- formed bodies everywhere stud the mantle, and fill up. FIG. 61.—Ovaries of Styela tuberosa. More highly magnified. to a considerable extent the spaces between the former. The latter bodies are most frequently pedunculate, and are sometimes as large as the reproductive masses, from which they chiefly differ in colour, being pale, some- what pellucid, and almost homogeneous in structure. They do not seem to have any high functional import, their office apparently being to form, along with the generative bodies, a sort of pad or level surface for the support of the branchial sac, which otherwise might suffer from the inequality produced by the genitalia. These peculiar outgrowths are found in all the Ci/n- t)ii«thi' which have been examined. The reproductive organs are similar to the above in S. mamiUaris and in some other 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
Size: 1967px × 1270px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectseasquirts
