C. H. Ostenfeld : A List of Phytoplankton from the Boeton Strait, Celebes. 7 



ranean, the Atlantic and the South Sea; D. diegensis Kofoid, from 

 the Californian Pacific; and D. pedunculate, from the Malay Archi- 

 pelago, the Gulf of Siam and the Sea off Japan. 



Gonyaulax polygramma Stein 1. c, tab. 4, fig. 15. Found in 

 the sample, but very rare. 



Ornithocercus magnificus Stein, 1. c, tab. 23, figs 1—2; Schutt, 

 Botan. Zeit., 1900, p. 18, figs. 8 — 10. Found in the sample. 



O. Steinii Schutt, Botan. Zeit, 1900, p. 18, figs. 5-7; O. magni- 

 ficus Stein, 1. c, tab. 23, fig. 4. 



Drawn by Dr. Justesen and found in the sample. The drawings 

 show the symbiotic yellow-brown unicellular algæ in the girdle. — 



I have only been able to refer some of the many drawings of 

 Peridinium-forms to species, as the tabulation and other necessary 

 marks of distinction were not evident. On the other hand several 

 species were found in the sample ; they were much better preserved 

 herein than for instance the Cera/mm-forms. 



Peridinium assymmetricum (Mangin) nob.; Peridiniopsis assyme- 

 trica Mangin, Comptes rendus Acad. Sc, 153, 1911, p. 30; ibid, 

 p. 645; Diplopsalis lenticula auctt., e. g. Stein, 1. c, tab. 8, figs. 13, 14, 

 tab. 9, figs. 2—5; vix Bergh; Diplopelta bomba Jørgensen, Svenska 

 Hydrogr. biol. Komm. Skrifter, 4, 1912, p. 9. 



Owing to the incomplete description and the lack of any tabula- 

 tion in the figures, the Peridinian described by B. Bergh (Morphol. 

 Jahrb. I, 1881, p. 244, figs. 20—22) as Diplopsalis lenticula has been 

 the object of long controversies between E. Jørgensen, L. Mangin, 

 O. Paulsen and J. Pavillard. As far as I understand the matter, 

 all these authors agree in the fact that we have two distinct species 

 under the name Dipl. lenticula, a smaller neritic one, and a larger 

 oceanic one; but they differ with regard to the names. I follow 

 E. Jørgensen (1. c, 1912, p. 9) in taking the small neritic species 

 as the true Dipl, lenticula of Bergh, as it is this which occurs at 

 the place where Bergh originally studied the organism in question, 

 viz. Little Belt, one of the Danish Waters. Thus we have to chose 

 another name for the larger oceanic species, and Jørgensen revives 

 for it an old manuscript name by Stein; but Stein himself tells us 

 (1. c, p. 12) that he used this name in his notebook for what he 

 afterwards identified as being Dipl. lenticula — that is for both species; 

 this name is therefore not a valid one. Therefore we must take 

 Mangin's name: Peridiniopsis assymetrica. 



The recent closer studies of the tabulation of the small Peridi- 

 niums and related forms show such a variation of plate arrangement, 

 that I prefer, as O. Paulsen (Bulletin trimestriel, Bésumé planktonique, 

 3 part, 1913, p. 265) has done, to unite all the related genera (Peri- 

 dinium Ehbg., Peridiniopsis Lemm, Preperidinium Mangin, Dii>lopsalis 

 Bergh and Diplopsalopsis Meunier) into one genus, viz. Peridinium. 

 The species which must be transferred to Peridinium, are the follow- 

 ing: Peridinium lenticula (Bergh) Pauls, (syn. P. Paulsenii Mangin; 

 P. Meunieri Pavillard; Diplopsalis lenticula, /'. minor Pauls.; Dipl. 

 sphærica Meunier); P. assymetricum (Mangin) nob.; P. caspicum (Ostf.) 



