English: Illustration from Report on the Radiolaria collected by Challenger during the years 1873-1876. Part III. Original description follows: Plate 46. Porodiscida. Diam. Fig. 1. Histiastrum boseanum, n. sp., × 400 Fig. 2. Histiastrum pentadiscus, n. sp., × 200 Fig. 3. Histiastrum quadrigatum, n. sp., × 300 Fig. 4. Histiastrum velatum, n. sp., × 200 Fig. 5. Stephanastrum quadratum, n. sp., × 200 . 1887 66 Radiolaria (Challenger) Plate 046

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