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 ...

THERE are probably few precedents for the publication of an unfinished biological monograph thirty years after the authors penned their last remarks, especially of a monograph dealing with a group ...

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