Description: English: Illustration from Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Part III. Original description follows: Plate 73. Podocyrtida et Phormocyrtida. Diam. Fig. 1. Pterocanium tricolpum, n. sp.,: ×: 400. Fig. 2. Pterocanium orcinum, n. sp.,: ×: 400. Fig. 3. Pterocanium gravidum, n. sp.,: ×: 400. Fig. 4. Pterocanium eucolpum, n. sp.,: ×: 400. Fig. 5. Pterocanium bicorne, n. sp.,: ×: 400. Fig. 6. Pterocanium virgineum, n. sp.,: ×: 400. Fig. 7. Dictyopodium thyrsolophus, n. sp.,: ×: 300. Fig. 8. Dictyopodium scaphopodium, n. sp.,: ×: 300. Fig. 9. Calocyclas monumentum, n. sp.,: ×: 400. Fig. 10. Calocyclas casta, n. sp.,: ×: 400. Date: 1887. Source:
https://archive.org/details/reportonradiolar00haecrich. Author: Ernst Haeckel (1834-1919); engravings by Adolf Giltsch (1852-1911).