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Quarterly Journal of Microscopical Science, Vol s3-92, 249-254, Copyright © 1951 by Company of Biologists
1 Marine Station, Millport, Isle of Cumbrae, Scotland
Stolonic test vessels are described in four members of the ascidian family Didemnidae. The epidermal cells of the terminal swellings of the vessels appear to produce test substance. The stolonic vessels, area of budding and muscular appendix are probably all derived from the posterior end of the ancestral zooid.