. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. BRITISH TUNIC ATA. are of a brownish colour and very numerous; so that it some- times happens that in this animal large portions of the blood- system can be traced in a single individual. Most of the information on this portion of the anatomy has been obtained from these three species ; but nevertheless several important points have been verified in the living animal. The blood-system in the simple Tunicates may be looked upon as closed, however limited the true vascular portion of it may be. The blood-channels throughout
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. BRITISH TUNIC ATA. are of a brownish colour and very numerous; so that it some- times happens that in this animal large portions of the blood- system can be traced in a single individual. Most of the information on this portion of the anatomy has been obtained from these three species ; but nevertheless several important points have been verified in the living animal. The blood-system in the simple Tunicates may be looked upon as closed, however limited the true vascular portion of it may be. The blood-channels throughout the organism. FKI. 4.—Blood, lacunae (curved) and muscular bands (straight) between the mantle and lining- membrane of Ascidia venosa. Highly magnified. «. Blood globules, much more highly magnified, of a reddish-yellow colour and containing a few granules. are well denned ; but whether or not they are provided with proper walls, and, if so, to what extent, is not easy to determine. The trunk channels leading to and from the heart have cer- tainly all the appearance of being true vessels; and the branchial network lias likewise the character of being truly vascular. The blood-channels in the test have also distinct walls ; but in this case they are apparently composed of a prolongation of the mantle or inner tunic. Traces, however, of an inner vessel may be observed in the main trunks ; but this apparent vessel may be nothing more than a continuation. 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
