THE detailed classification of the Tunicata, and especially of the so-called “Compound Ascidians,” has usually been found a matter of special difficulty by systematists, and each successive ...

(The Tunicata are thin, lithe animals that move about the sea in their youth, investigating their surroundings. Then one day they grow fat, settle down on the ocean floor--never to move again--and ...

THE first volume of this work was published in 1905, and was noticed in NATURE in the following year (vol. lxxiii., p. 508). So far as the so-called “simple” and “social” Ascidians are concerned, the ...

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