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Quarterly Journal of Microscopical Science, Vol s3-92, 377-383, Copyright © 1951 by Company of Biologists

The Blood-system in the Serpulimorpha (Annelida, Polychaeta)

IV. Intravasal Tissues

JEAN HANSON 1

1 Department of Zoology, Bedford College, University of London; now at M.R.C. Biophysics Research Unit, King's College, Strand, London, W.C.2

Intravasal tissues of unknown function have been found in Pomatoceros triqueter, Vermiliopsis infundibulum, Protula intestinutn, and Apomatus ampulliferus. They consist of connective tissue fibres clothed with small cells with densely staining cytoplasm. In Pomatoceros the tissue is situated intersegmentally in the gut sinus of the thorax and anterior part of the abdomen; it lies on each side of the sinus, and the ring vessels open into spaces within it. In Vermiliopsis the intravasal tissue fills the sinus in the posterior part of the abdomen. In Protula and Apomatus it is situated in swellings of specialized structure on the abdominal ring vessels close to the sinus. They closely resemble the ‘blood-glands’ of Pheretima (Stephenson, 1924). These intravasal tissues may correspond to the heart body which other annelids possess but serpulids and sabellids lack.






© The Company of Biologists Ltd 1951