Peridium, Haeckel, E. H. P. A., 1887

Haeckel, E. H. P. A., 1887, Report on the Radiolaria collected by H. M. S. Challenger during the years 1873 - 1876, Report on the Scientific Results of the Voyage of H. M. S. Challenger During the Years 1873 – 76, Zoology 18, pp. 1-1803 : 1153

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