C. H. Ostenfeld: A List of Phytoplankton from the Boeton Strait, Celebes. 9 



drawings. P. latissimam Kofoid (Bull. Mas. comparat. Zoology at 

 Harvard Coll., vol. 50, No. 6, 1907, p. 175, pi. 5, figs. 31, 32) seems 

 very near to it (perhaps identical), the outline being the same in the 

 two species; but the tabulations of the epitheca are different. 



P. pellucidum (Bergh) Schutt, Die Peridineen der Plankt. Exped., 

 1895, p. 157; Protoperidinium p. Bergh, I.e., 1881, p. 227, figs. 46— 48. 

 Found in the sample. 



P. pyriforme Paulsen, Peridineen, in Nord. Plankton, 1908, p. 46, 

 fig. 57. 



Some of Dr. Justesen's drawings must be referred to this species, 

 others are more doubtful. 



P. quarnerense (B. Schröd.) Broch, Arch. f. Protistenkunde, 20, 

 1910, p. 183, fig. 3. 



A species which answers to the drawings by Broch (1. c.) and 

 to Stein's fig. 8 (tab. 9) of his P. globulus, was found in the sample. 



P. Steinii Jørgensen, Bergens Museums Aarbog 1899, No. VI, 

 p. 38. 



Specimens referable to subsp. mediter raneiim Kofoid (Arch. f. 

 Protistenkunde, 16, 1909, pi. 2, figs. 1 — 11) were found in the 

 sample. 



Phalacroma porodictyum Stein, 1883, 1. c, tab. 18, figs. 11 — 14. 



Found in the sample. 



Podolampas bipes Stein, 1. c, tab. 8, figs. 6—8. 



Drawn by Dr. Justesen. 



Prorocentrum micans Ehrenberg, Abhandl. d. Berlin. Akad., 

 1833, p. 307; Stein, 1. c, 1883, tab. 1, figs. 1-3, 12. 



Found in the sample. 



Pyrophacus horologicum Stein, 1. c, tab. 24. Both found in the 

 sample and drawn by Dr. Justesen. 



IV. Bacillariaceæ (Diatoms). 



Actinocyclus Ehrenbergii Balfs, in Pritchard, Infusoria, p. 834; 

 Van Heurck, Synopsis, 1880-81, p. 215, tab. 123, fig. 7. 



Common in the sample in numerous forms, some answering to 

 the figure quoted, others to the figure of A. Ralfsii (W. Sm.) Balfs 

 (Van Heurck, 1. c, fig. 6), the main part being in characters some- 

 where between the two forms which can not be kept as two species. 



A. subtilis (Greg.) Balfs, 1. c, p. 835; Van Heurck, 1. c, p. 216, 

 tab. 124, fig. 7. 



Found in the sample, but it seems doubtful if this form is really 

 distinct from the foregoing species. 



Asterionella notata Grun., in Van Heurck, 1. c, tab. 52, fig. 3; 

 Cleve, K. Svenska Vetensk. Akad. Handl., 34, No. 1, 1900, p. 19, 

 pi. 7, fig. 32. 



Dr. Justesen has drawn an excellent figure of a chain of this 

 little known species; it (fig. 2) shows the numerous small chroma- 

 tophores. 



