KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 229 



Gymnodinium lohmanni Paulsen 

 Text figures BB, 1, 5, 12 



Gymnodimum rose urn Lohmann (1908), pp. 202, 252, 263-264, 366, 368, pi. 17, figs. 2^28; 



(1911), p. 20. 

 G. lohmaiim Paulsen (1908), pp. 99-100, fig. 137 A-D. 

 G. lohmanni, Ostcnfeld (1913), p. 338. 

 Not G. roseum Dogiel (1906), pp. 21-26, pi. 2, figs. 26-37, now Chytriodinvum roseum 



(Dogiel) Chatton (1912). 



Tn 1908 Lohmann |)iiblislied a descri]ition and four figures of a species Avhieh 

 he called fj/jnuiodiiiinHi rone urn. It is a large species 70-115/^ long, with rotund 

 ovoidal body, asjanmetrical, non-terminal horn, premidian transverse girdle, 

 rounded antapex. The sulcus was not found. In his figure 26 it appears that 

 the girdle is oblique, as in Gyrodininm, but this is leased on preserved material, 

 and may be distorted or even another species, perhaps of Gijrodinium. Its 

 apex, however, is of the G. lohmanni type. It is probable that the asjanmetrieal 

 spiral horn is related to our apical loop of the sulcus. 



The c}i:oplasm is filled with stout, rodlike, peripheral rhabdosomes in radial 

 or longitudinal arrangement and crowded with large vacuoles filled with a rosy 

 fluid. An ellipsoidal nucleus, with spirally arranged parallel chromatin threads, 

 is variously located within the cytoplasm, which also contains what appear to 

 be food balls of various sizes. It is evidently a holozoic species. 



While its girdle is indicated, its sulcus is not delineated, hence it is impos- 

 sil)le to define its relationships with certainty, even as to its generic allocation. 

 We therefore leave it tentatively in Gyninodininm. 



Synonymy. — Lohmann (1908) described it as Gymnodiniiini roseum, using 

 a name preoccupied by G. roseum of Dogiel (1906), a species which was later 

 transferred by Chatton (1912) to his parasitic genus Chyfn'odinium. Paulsen 

 (1908), in his monograph of the Peridiniales in "Nordisches Plankton," 

 recognized the error of Lohmann and gave the species the name G. lohmanni. 



Gymnodinium lunula Schiitt 



Plate 5, figure 55 ; text figure I 



"Kysfcs des Peridiniens" Claparede and Laehmann (1858-61), pp. 69-73, pi. 13, figs. 



16-22. 

 Gymnodinium lunula Schiitt (1895), in part, pp. 4, 11, 43, pi. 24, figs. 80,,, _5, _,,, .„, pi. 25, 



figs. 80.3, _„ .„, _„ -„, _„; as Pyrocystis lunula (1896), pp. 3, 4, figs. 2 B-F. 

 Pyrocystis lunula, Jorgensen (1899), p. 26, tables 18, 44; (1910), p. 147. 

 P. lumda, Lemmermann (1899), p. 358; (1901), p. 3.58; (1902), p. 260; (1905o), p. 20. 

 P. lunula, Murray and Whiting (1899), pp. 337, 339, 340, tables 5-9. 

 P. lunula, Ostenfeld (1899), tables 3, 5, 6; (1900), tables 5, 7 ; (1906), p. 6; (1909), p. 7; 



(1913), pp. 339, 344, 476. 

 P. lunula, Schroder (1900), p. 13; (1906), pp. 321, 327, 330, 339; (1911), pp. 620, 626, 



651. 



