C. H. Ostenfeld: A List of Phytoplankton from the Boeton Strait, Celebes. 5 



C. dens Ostenfeld et Schmidt, 1. c, p. 165, fig. 16; Jørgensen, 

 1. c., p. 31, fig. 58. 



This species occurs in chains; one of Dr. Justesens drawings 

 shows a chain consisting of 4 individuals. 



C. extensum (Gourret) Cleve, The seasonal distribution of Atlant. 

 Plankton Organisms, Göteborg, 1901, p. 215; Jørgensen 1. c, p. 28, 

 fig. 50. 



Drawn by Dr. Justesen. 



C. furca (Ehbg.) Dujardin, subsp. eugrammum (Ehbg.) Jørgensen, 

 1. c, p. 17, fig. 24-26. 



Both a form with shorter horns (answering to Jørgensens fig. 24) 

 and one with longer horns (Figs. 25—26) were found. 



C. fusus (Ehbg.) Dujardin, subsp. seta (Ehbg.) Jørgensen, 1. c, 

 p. 29, fig. 55. 



Drawn by Dr. Justesen. 



C. deflexum (Kofoid) Jørgensen, 1. c, p. 64, fig. 138; C. macro- 

 ceras deflexum Kofoid, Univer. Calif. Public, Zoology, III, 13, 1907, 

 p. 304, tab. 24, fig. 13-15. 



Was found rarely in the sample. 



C. gallicum Kofoid, 1. c, p. 302, tab. 24, fig. 10-12; C. macro- 

 ceras, subsp. gallicum Jørgensen, 1. c, p. 63, fig. 134 — 135. 



To this species I refer the figures of C. macroceras published 

 by Ostenfeld and Schmidt (1. c, fig. 19), Okamura and Nishikawa 

 (Annot. Zool. Japon. V, 3, 1904, fig. 2, reversed) and Okamura 

 (Annot. Zool. Japon. VI, 2, 1907, pi. IV, fig. 19) besides those quoted 

 by Kofoid and Jørgensen. 



C. gibberum Gourret, f. sinistrum Gourret, Ann. Musée d'hist. 

 nat. de Marseille, Zool., I, 8, 1883, p. 36, tab. 2, fig. 34; Jørgensen, 

 1. c, p. 50, figs. 107-109. 



Both drawn by Dr. Justesen and found by me in the sample. 



C. inflexum (Gourr.) Kofoid, Univ. Calif. Public. Zoology, 1908, 

 IV. 7, p. 388; Jørgensen, 1. c, p. 76, figs. 160—161. 



This species is very close to C. trichoceras (Ehbg.) Kofoid (1. c, 

 p. 388; Jørgensen, 1. c, p. 75, fig. 159), but still I think that my 

 identification of Dr. Justesen's two drawings is correct. 



C. massiliense (Gourr.) Jørgensen, 1. c, p. 66, figs. 140—142. 



I do not know if Jørgensen is right in using this name for 

 the common long -horned tropical Ceratium- species which has 

 quite a number of other names, but I think it most convenient, at 

 present, to follow him. The species was very common in the 

 plankton of Boeton Strait as is evident from the many drawings 

 made by Dr. Justesen. 



C. pennatum Kofoid, Bull. Mus. comparat. Zoology at Harvard 

 Coll, 50, No. 6, 1907, p. 172, tab. 2, fig. 12; Jørgensen, 1. c, p. 26, 

 fig. 48 a. 



The drawings show a form which forms a transition from the 

 main species to the var. falcatum Kofoid (1. c, fig. 14). 



C. reticulatum (Pouchet) Cleve, Arkiv f. Zoologi, I, 1903, Stock- 

 holm, p. 342; Jørgensen, 1. c, p. 86, figs. 182-183. 



Drawn by Dr. Justesen. 



