Smithsonian Contributions to Knowledge.
Clark, H. L. (1908). The apodous holothurians. A monograph of the Synaptidae and Molpadiidae.
The apodous holothurians. A monograph of the Synaptidae and Molpadiidae
Smithsonian Contributions to Knowledge
1907 is printed on title page, however, this monograph was published in January 1908, based on a footnote in H.L. Clark 1921: p. 159
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