C. H. Ostenfeld: A List of Phytoplankton from the Boeton Strait, Celebes. \~] 





Paralia sulcata (Ehbg.) Cleve, Bih. Sv. Vet. Akad. Handl., Bd. 1, 

 Nr. 13, 1873, p. 7 ; Gran, Diatom, in Nord. Plankton, 1905, p. 14, fig. 5. 



Found sparingly in the sample. 



Planktoniella sol (Wallich) Schutt, in De Toni, Sylloge Algar., 

 1894, p, 1424; Pflanzenleben der Hochsee, 1895, p. 20, fig. 8 ; Karsten, 

 Deutsche Tiefsee Exp. 1898-99, Bd. II, Teil 2, 1907, p. 369, pi. 39^ 

 figs. 1-11. 



Both found in the sample and also drawn by Dr. Justesen. — 



Many of the drawings by Dr. Justesen showing forms of the 

 genus Rhizosolenia are impossible to identify owing to the absence of 

 any structure. 



Rhizosolenia alata Brightwell, Quart. Journ. microsc. Sc, London, 

 6, 1858, p. 96, tab. 5, fig. 7. 



This widely distributed species was present in the sample in a 

 long-beaked form. Amongst Dr. Justesens drawings several are to be 

 referred to this species, most of them belonging to the f. indica 

 (Perag.) Ostenfeld (Vid. Medd. Naturh. Forening, København, 1901, 

 p. 160; Botan. Tidsskr., 25, p. 227, fig 3). An interesting figure 

 shows the auxospore formation ; the auxospore represents the f. 

 indica, the old cell is the typical form. 



Rh. amputata Ostenfeld, Botan. Tidsskr., 25, p. 227, fig. 4; 

 Karsten, Deutsche Tiefsee Exp. 1898-99, Bd. II, 2. Teil, 1905—07,, 

 p. 376, pi. 42, fig. 2. Of this species, which seems to be an Indo- 

 malayan form, Dr. Justesen has made three drawings. 



Rh. calcar-avis Schultze, in Müll. Archiv, 1858, p. 339, pi. 13 

 figs. 5—10; Gran, Diatom., in Nord. Plankton, 1905, p. 54, 

 fig. 66. 



The same circumstances as in Rh. alala here apply: 

 most of the drawings represent the large tropical form, 

 f. cochlea (Brun) Ostenfeld (Botan. Tidsskr., 25, p. 228, 

 fig. 5), some are intermediate and others again are like 

 the typical form ; further the auxospore formation (in the 

 same manner as that of R. alata) shows an auxospore part 

 which is f. cochlea and a remainder which is the type. 



Rh. crassispina B. Schroeder, Vierteljahrsschr. Naturf. 

 Ges. Zürich, 51, 1906, p. 345, fig. 5. 



Some drawings (Fig. 10) show that this interesting species, 

 which was hitherto known from Asiatic coastal waters of the 

 Pacific, also occurs in the Boeton Strait. B. Schroeder suggests 

 (1. c.) that it should perhaps be referred to Rh. hebetata 

 Bail, as a variety, but it seems to me very different from 

 that species. On the other hand, the structure is still 

 unknown, and the place within the genus therefore uncertain. 



Rh. imbricata Brightwell, I.e., 1858, p. 95, pi. 5, fig. 6; 

 H. Peragallo, Monogr. Rhizosol., p. 113, pi. 5, figs. 2-3. 



Drawn several times by Dr. Justesen. 



Rh. robusta Norman, in Pritchard, Infus. 1861, p. 866, 

 pi. 8, fig. 42; Peragallo, 1. c, p. 109, pi. 2, fig. 1, pi. 3, B- Schroed.; 

 figs. 1-2; Karsten, Deutsche Tiefsee Exp. 1898-99, Bd. 2, 2, Sjrdk mew 

 p. 163, 1906, pi. 29, fig. 10. D ( r ™esS) 



Fig. 10. 



Rhizosolenia 



crassispina 



