I g Dansk Botanisk Arkiv, Bd. 2, Nr. 4. 



Numerous drawings of this characteristic species were made. 



Rh. setigera Brightwell, 1. c, 1858, p. 95, pi. 5, fig. 7; Gran, 

 Diatom, in Nord. Plankton, 1905, p. 53, fig. 64. 



Drawn by Dr. Justesen and also found by me in the sample. 



Rh. Stolterfothii H. Peragallo, Diatom, de Villefranche, 1888, 

 p. 90, pi. 6, fig. 44; Gran, 1. c, p. 49, fig. 55. 



Drawn by Dr. Justesen. 



Rh. styliformis Brightwell, Quart. Journ. microsc. Sc, 6, 1858, 

 p. 96, pi. 5, fig. 5; Peragallo, Monographie Rhiz., p. Ill, pi. 4, 

 figs. 1—5. 



Both the type and the large tropical form, f. latissima Btw. 

 (1. c, fig. 5 c), were represented amongst the drawings. 



Roperia tesselata (Roper) Grun , in Van Heurck, Synopsis, 1885, 

 pi. 118, fig. 6; Eupodiscus tesselatus Roper, Quart. Journ. Microsc. Sc, 

 6, 1858, p. 19, pi. 3, lig. 1. 



Found in the sample. 



Stephanopyxis Palmeriana (Grev.) Grunow, Denksch. Akad. Wien, 

 1884, p. 38; Otto Müller, Ber. deutsch. Bot. Ges., 1901, 19, p. 196, 

 fig. 1; Creswellia P. Greville, Transact. Microsc. Sc, 1865, p. 2, pi. 1, 

 fig. 9. 



Common in the Boeton Strait, to judge from the many drawings. 



S. turris (Grev.) Ralfs, in Pritchard, Infus., 1861, p. 826, pi. 5, 

 fig. 74; Gran, Diät, in Nordisches Plankton, 1905, p. 14, fig. 6. 



Drawn by Dr. Justesen. 



Streptotheca thamensis Cleve, in Shruhsole, Journ. Quekett 

 Microsc Club, 1890, N. S., 4, p. 259, pi. 13, fig. 4-6; S. maxima 

 Cleve, Kgl. Svenska Vet. Akad. Handl., 35, Nr. 5, 1901, p. 57, pi. 8, 

 fig. 5; S. indica Karsten, Deutsche Tiefsee Exp. 1898-99, Bd. 2, 

 Teil 2, 1907, p. 395, pi. 46, fig. 8. 



Amongst Dr. Justesens drawings both the typical S. thamensis 

 and the large tropical form (S. maxima) are found, thus showing the 

 identity of the two species. 



