. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. FIGS. 5 AND 6.—Transverse sections of the endostyle of Ascidia mentula, highly magnified. The shaded portion represents the dorsal blood-sinus, the thick black line the endoderm. Fig. 5, before separation of the lips. Fig. (3, after separation. rods appear to be united (see PL III, fig. 5, and figs. 5 and 6 in text). The upper extremities of these folds diverge right and left, and become continuous with the lower member of what may be termed the anterior cord or collar—two narrow folds also of the lining membrane that enci
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. FIGS. 5 AND 6.—Transverse sections of the endostyle of Ascidia mentula, highly magnified. The shaded portion represents the dorsal blood-sinus, the thick black line the endoderm. Fig. 5, before separation of the lips. Fig. (3, after separation. rods appear to be united (see PL III, fig. 5, and figs. 5 and 6 in text). The upper extremities of these folds diverge right and left, and become continuous with the lower member of what may be termed the anterior cord or collar—two narrow folds also of the lining membrane that encircle the base of the respiratory tube, a little above the anterior margin of the branchial sac, and having the circular blood-channel, pre- viously mentioned, immediately below them. The ventral margin of the sac is furnished with a wide, longitudinal, delicate, membranous fold, which apparently also orginates in the lining membrane, and which interrupts the continuity of the minute network in this direction. This is the ventral or oral lamina (PI. XIX); it extends from end to end of the branchial sac, and is ribbed transversely; the margin is entire. The mouth opens close by its left side, about one-third from the lower extremity : the upper extremity for some little way downwards is divided longitudinally, showing that the lamina. 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
