Untersuchungen über begeißelte und beflimmerte Organismen

The Functional Organization of the Nervous System of Enteropneusta

“…They can be directly observed in the former process. In 5. pusillus, as Ritter and Davis (1904) it may be stated that at present there is not the least ground for the assumption that true nervous activity is in any direct way involved in ordinary ciliary reactions," * there has been brought forward convincing evidence of nervous modification of ciliary activity in several cases (Gothlin, 1920;Alverdes, 1922;Copeland, 1922;Merton, 1923;Carter, 1926 Here is seen an impressive degree of ciliary reversal and inhibition. The movements incident to burrowing and to advance and retreat within the burrows, comprise the sum total of muscular exertions of most of these animals.…”