4) 
32 14 
ho 
species, but I have never seen the true R. Tenperei. 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 Shadcb. 
37. B. hyalinum Lauder, Trans. Micr. Soc. 
1864, p.8, PI. 3, f. 7a,b; Cleve, Atl. Plankt. 
Organisms p. 286; PI. f. the Ind. Ocean and 
the Malay Archip. p. 18 and p. 54; B. spirilluin 
ex parte and B. varians var. princeps Castr., 
Challenger pp.83,84, Pl.14, £2, Pl.29, f.1, 3. 
This interesting species which Lauder has 
described and figured in 1863, has been forgotten 
for long time; Cleve 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 
Castracane in his report on Challenger-Dia- 
Rat: Baer toms has figured and named B. varians var. 
ee Se princeps and also his figure Pl. 29, f.1 of B. 
hyalinum Laud. Part ofa spirillum belongs hereto. The fig. 9 illustrate 
chain with terminal cell; this species 
beneath a terminal cell in ; i 
side view, showing the i bee ee ear 
terminal awns (+2). Area: Malay Archipelago, South China Sea. 
38. 8B. yarians Lauder, Trans. Micr. Soc. 1864, p.8, PI. 3, f. 1—6; 
Cleve, Diat. f. the Sea of Java 1873, p.8; Grunow, Novara Exp., 1870, 
p- 28; Leuduger-Fortmorel, |. c. p. 36; Cleve, Pl. f. the Ind. Ocean and the 
Malay Archip. p. 18; Schréder, Neapel p. 26; Van Heurck, Synopsis, Pl. 80, 
f.3—5; B.varians et var., B. brevispinum et var., B. spirillum ex parte, 
B. Weallichit, var. hispida Castr., Challenger p. 82—84, Pl. 15, f. 6, 8, 
Pl. 19, f. 2, PL 23, f£.1,3; Actiniseus varians Van Heurck, Synops. Pl. 82 
bis, f. 10; B. symmetricum Leuduger-Fortmorel, 1. c. p.36, Pl. 7, f. t. 
I regard all the species described by Gastracane and Leuduger- 
Fortmore] as belonging to the very variable B. varians. 
1(+) — 2(r) — 3(rr) — 4(rr) — 507) — 6(4+) — 7 (rr) — 10 (c). 
Area: Mediterranean, Red Sea, Gulf of Aden, Indian Sea, Malay Archipelago, 
South China Sea. A nearly allied form (var. borealis Ostenfeld, Nyt Magazin, 
Kristiania, 1901, p. 293, f.5) is common along the Coasts of Western Europe. 
