17 
b9 
racy 
or 
I regard the C. Kelleri Brun which 
was found in oysters from Japan as 
identical with the C. compressum Lauder, 
and I have given a figure of the coarse, 
tvisted awns of C. compressum in order 
to show this identity. 
1(rr) — 2(r) — 3(rr) — 6(rr) — 10(c). 
Area: Red Sea, Malay Archipelago, 
Hongkong. — Neritic species. 
Fig. 12. 
Chaetoceras compressum Laud. 
Cell with twisted coarse awns, 
46. (. didymum Ehbg. (1845); in side view (722), 
Cleve, Bih. t. Sv. Vet. Akad. Handl. 
Bd. 20, III, No. 2, 1894, p. 18, Pl. 1, f. 3, 4; Gran, Norske Nordhavs 
Expedition, Protophyta p. 16, Pl. 1, f.8—10 and PI. III, f.37, 38; Cleve, 
Atl. Plankt. Organisms p. 301; Schréder, Neapel p. 27; C. protuberans 
Castr., Challenger p. 76, Pl. 8, f.2, non Lauder. 
10 (r). 
Area: Along the Atlantic Coasts of Europe, Mediterranean, Japan Sea, 
Puget’s Sound. 
47. (. distans Cleve, Diat. f. the 
Sea of Java 1873, p.9, PI. IL, f. 11 a,b; 
Leuduger-Fortmorel 1]. ¢. p.37; de Wil- 
deman, l.c. p.133; Ostenfeld & Schmidt, 
Pl. f. the Red Sea, etc. p. 154; Cleve, 
Pl. f. the Indian Ocean and the Malay 
Archip. 1902, p. 18 and p. 55; non 
Van Heurck, I.c. Pl. 82, f.4; nec Cleve, 
Planktonundersékningar, Bih. t. K. Sv. 
Vet. Akad. Handl. B. 20, III, No. 2, 1894, 
p. 14, PIII, f. 2. 
The chromatophore is solitary, the 
hoop rather narrow (se fig. 13). 
1(+) — 2(rr) — 4(rr) — 5 (rr) — 6 (rr) 
— 7(rr) — 10(-+). 
Area: Malay Archipelago, Red Sea. 
Fig. 13. Chaetoceras distans Cl. 
Chain with chromatophores. 
48, ¢. diversum Cleve, Diat. f. the Sea of Java 1873, p.9, Pl. Il, 
f. 12; Leuduger-Fortmorel, lc. p.37; Van Heurck, l.c. Pl. 81, f.4; de 
Wildeman, J. c. p. 133; Cleve, Atl. Plankt. Organisms, p. 302; Plankt. f. 
the Ind. Ocean and the Malay Archipelago p. 18; Plankt. f. the Red Sea 
p. 154; C. diversum v. tenuis Cleve, Phytoplankton p.21, Pl. I, £2; ¢ 
diversum v. mediterranea Schréder, Phytopl. d. Golfes v. Neapel, Mitteil. 
