. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. CYNTHIA ECHINATA. 95 [The test of this species is represented by fig. 10 on Plate XXX.] The mantle (PI. XXXII, fig. 8) is firmly attached to the test, particularly in the region of the tubes, and the tubes themselves cannot be withdrawn without laceration; it is rather thin, tough, and transparent; the muscular fibres are delicate and regularly arranged, somewhat apart; those radiating from the tubes being the best displayed; the inner surface seems to be devoid of the usual soft nodules. The tentacular filaments (fig. 59)
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. CYNTHIA ECHINATA. 95 [The test of this species is represented by fig. 10 on Plate XXX.] The mantle (PI. XXXII, fig. 8) is firmly attached to the test, particularly in the region of the tubes, and the tubes themselves cannot be withdrawn without laceration; it is rather thin, tough, and transparent; the muscular fibres are delicate and regularly arranged, somewhat apart; those radiating from the tubes being the best displayed; the inner surface seems to be devoid of the usual soft nodules. The tentacular filaments (fig. 59), about sixteen in number, are alternately large and small, rather long and slender, and incompletely tri-pinnate. The branchial sac is delicate with five folds on each. FIG. 59.—A tentacular filament of Cynthia echinata. Highly magnified. side, four of which are well developed, and one, that next the endostyle, is narrow. The blood-channels are peculiarly arranged. Stout longitudinal vessels pass with much regularity from end to end of the organ, and, but for this arrangement, would be taken for primary vessels; and other small vessels having the appeai'ance of secondary vessels, divided by stomata, are placed transversely between the large ones; the stomata are long with rounded extremities. The small vessels in this case must conduct the blood from the dorsal to the ventral channel and consequently act as primary vessels; while at the same time the chief aeration must take place through their walls, for here the blood is the most minutely divided. Nevertheless from their anatomical connections they should perhaps. 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.
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Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectseasquirts
