16 



Dansk Botanisk Arkiv, Bd. 2, Nr. 4. 



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. 1—2. 

 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" view. ""(Drawn by P 1 - 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. 24, pi. 2, fig. 25-28; Ostenfeld, 

 Botan. Tidsskr., 25, 1902, p. 245, fig. 23. 

 Several drawings of this species. 

 Palmeria Hardmaniana Grev. ; Van Heurck, A Treat- 

 ise of the Diatomaceæ, 1896, p. 538, f. 286; Ostenfeld, 

 Botan. Tidsskr., 25, 1902, p. 222, figs. 1-2. This riopsis costata 

 interesting form was found in the sample and Dr. Ju- Ostf.; girdle 

 stesen has made several drawings of it view. (Drawn by 



Dr. Justesen.) 



