. Dansk botanisk arkiv. Plants; Plants -- Denmark. 16 Dansk Botanisk Arkiv, Bd. 2, Nr. Fig. 8. Ditylium triyonum B. Ditylium sol (Van Heurck) De Toni, Sylloge Algar., 1894, p. 1018; B. Schroeder, 1. c, p. 355, fig. 23; Triceratium sol Van Heurck, Synopsis, pi. 115, figs. 1â2. Drawn by Dr. Justesen. D. trigonum B. Schroeder, Vierteljahrsschr. Naturf. Gesch. Zürich, 51, 1906, p. 356, fig. 25. One of Dr. Justesen's drawings (Fig. 8) agrees well with the description and figure of D. trigonum ; but I am not convinced that it is an independent species, more probably only a form of the foregoing
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 16 Dansk Botanisk Arkiv, Bd. 2, Nr. Fig. 8. Ditylium triyonum B. Ditylium sol (Van Heurck) De Toni, Sylloge Algar., 1894, p. 1018; B. Schroeder, 1. c, p. 355, fig. 23; Triceratium sol Van Heurck, Synopsis, pi. 115, figs. 1â2. Drawn by Dr. Justesen. D. trigonum B. Schroeder, Vierteljahrsschr. Naturf. Gesch. Zürich, 51, 1906, p. 356, fig. 25. One of Dr. Justesen's drawings (Fig. 8) agrees well with the description and figure of D. trigonum ; but I am not convinced that it is an independent species, more probably only a form of the foregoing species. Eucampia biconcava (Cleve) Osten- feld, Bot. Tidsskr., 25, 1902, p. 241, E. hemiauloides Ostenfeld, Vid. Medd. Naturh. For., København, 1901, p. 157, fig. 9; Climacodium biconccwum Cleve; A Treatise of Phytoplankton, 1897, p. 22, pi. 2, figs. 16-17. Dr. Justesen has made several drawings of this tropical species. E. zodiacus Ehbg., Kreideth., p. 71, Schroed., valvar";"(Drawn by P1- 4, fig. 8; Gran, Diatom., in Nord- Dr. Justesen.) Plankton, 1905, p. 98, fig. 126. Drawn by Dr. Justesen. Gossleriella tropica Schutt, in De Toni, Sylloge Algar., 1894, p. 1424; Das Pflanzenleben der Hochsee, 1895, p. 20, fig. 7; G. Kar- sten, Deutsche Tiefsee-Exp. 1898-99, 1906, p. 368, pi. 40, fig. 14. Dr. Justesen has made several nice drawings of this beautiful diatom. Hemiaulus sinensis Greville, Ann. Magaz. Nat. Hist. 16, p. 5, fig. 9, 1865; H. Heibergi Cleve, Bih. k. Svenska Vet. Akad. Handl. Bd. 1, 1873, No. 11, p. 6, pi. 1, fig. 6. Several drawings of this species were present. Lauderia annulata Cleve, 1. c, 1873, p. 8, pi. 1, fig. 7; Gran, Nyt Magaz. Naturv., Kristiania, 1900, p. 109, pi. 9, figs. 1-4. Drawn by Dr. Justesen. Lauderiopsis costata Ostenfeld, Vid. Medd. Naturh. Forening, København, 1901, p. 158, fig. 10. A drawing by Dr. Justesen (fig. 9) must be referred to this species. Navicula membranacea Cleve, A Treatise of Phyto- plankton, 1897, p.
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