14 



species, but I liave never seen the true R. Temperei. I have figured a 

 frustule and a part of it, showing the form of the spine. 



3 (rr; 



10 (r). 



Area: Of the main species: Mediterranean, Malay Archipelago; of the var. 

 acuminata: Tropical Atlantic Ocean, Mediterranean, Pacific Ocean at Sandwichs 

 Islands. 



Chaetocereae. 



Bacteriastrum Shadb. 



37. It. byaliniiin Lauder, Trans. Micr. Soc. 

 1864, p. 8, PI. 3, f. 7 a, b; Gleve, Atl. Plankt. 

 Organisms p. 286; PI. f. the hid. Ocean and 

 the Malay Archip. p. 18 and p. 54; B. spirilluin 

 ex parte and B. varians var. jjriiiceps Gastr., 

 Challenger pp. 83, 84, PI. 14, f.2, PI. 29, f. 1, 3. 



This interesting species which Lauder has 

 described and figured in 1863, has been forgotten 

 for long time; Gleve has now pointed out that 

 it is a distinct species and I am of the same opi- 

 nion. I think it must be the same species which 

 Gastracane in his report on Ghallenger-Dia- 

 toms has figured and named B. varians var. 

 princeps and also his figure PI. 29, f. 1 of B. 

 hyalinumhRm]. Part of a spirillum belongs hereto. The fig. 9 illustrate 



this species. 



1 (rr) - 3 (r) - 6 (+) - 10 (+). 



Fig. 9. 



Bacteriastrum 



chain with terminal cell . 

 beneath a terminal cell in 

 side view, showing the 

 terminal awns (^). Area: Malay Archipelago, South China Sea 



38. B. Tarians Lauder, Trans. Micr. Soc. 1864, p. 8, PI. 3, f. 1 — 6; 

 Gleve, Diat. f. the Sea of Java 1873, p. 8; Grunow, Novara Exp., 1870, 

 p. 28; Leuduger-Fortmorel, I.e. p. 36; Gleve, PL f. the Ind. Ocean and the 

 Malay Archip. p. 18 ; Schroder, Neapel p. 26 ; Van Heurck, Synopsis, PI. 80, 

 f. 3 — 5; B. varians et var., B.hrevispimim et var., B. spirillum ex parte, 

 B. Walliciiii, var. hispida Gastr., Ghallenger p. 82 — 84, PI. 15, f. 6, 8, 

 PL 19, f. 2, PL 23, f. 1,3; Adiniscus varians YanHeuvck, Synops. PL 82 

 bis, f. 10; B. symmetrictim Leuduger-Fortmorel, I.e. p. 36, PL 7, f. 1. 



I regard all the species described by Gastracane and Leuduger- 

 Fortmorel as belonging to the very variable B. varians. 



1 (4-) - 2 (r) - 3 (rr) - 4 (rr) - 5 (rr) - 6 (+) - 7 (rr) - 10 (c). 



Area: Mediterranean, Red Sea, Gulf of Aden, Indian Sea, Malay Archipelago, 

 South China Sea. A nearly allied form (var. boreaJis Ostenfeld, Nyt Magazin, 

 Kristiania, 1901, p. 293, f. 5) is common along the Coasts of Western Europe. 



