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Quarterly Journal of Microscopical Science, Vol s3-100, 167-181, Copyright © 1959 by Company of Biologists

Observations upon the Nervous Systems of Pelagic Tunicates

QUENTIN BONE 1

1 Department of Zoology, University Museum, Oxford

The sensory and motor systems of the pelagic tunicates Doliolum, Salpa, and Thalia are described, chiefly from observations made upon the living animals by phase-contrast microscopy. These observations confirm and extend previous work, showing that the sensory systems of these animals are anatomically highly specialized. Details of the sensory cells are shown from living specimens. It is shown that the motor systems of Doliolum and the salpa are essentially similar, but that of Doliolum is less specialized. The condition of the visceral nervous system in these animals is discussed, and it is concluded that the salpa possess peripheral nerve-cells upon the viscera; illustrations are given of these cells from fixed specimens.






© The Company of Biologists Ltd 1959