— 17 — 



I regard the C. Kelleri Brun which 

 was found in oysters from Japan as 

 identical with the C. compression Lauder, 

 and I have given a figure of the coarse, 

 tvisted awns of C. compression in order 

 to show this identity. 



1 (rr) - 2 (r) - 3 (rr) - 6 (rr) — 10 (c). 

 Area: Red Sea, Malay Archipelago, 

 Hongkong. - Neritic species. Chaetoceras compression Laud. 



Cell with twisted coarse awns, 



46. C. didymum Ehbg. (1845); in side view (H^)- 

 Cleve, Bih. t. Sv. Vet. Akad. Handl. 



Bd. 20, III, No. 2, 1894, p. 13, Pl. 1, f. 3, 4; Gran, Norske Nordhavs 

 Expedition, Protophyta p. 16, Pl. 1, f. 8-10 and Pl. Ill, f. 37, 38; Cleve, 

 Atl. Plankt. Organisms p. 301 ; Schröder, Neapel p. 27 ; C. protuberans 

 Castr., Challenger p. 76, PI. 8, f. 2, non Lauder. 

 10 (r). 



Area: Along the Atlantic Coasts of Europe, Mediterranean, Japan Sea, 

 Puget's Sound. 



47. C. distans Cleve, Diat. f. the 

 Sea of Java 1873, p. 9, Pl. II, f. 11 a, b; 

 Leuduger-Fortmore! 1. c. p. 37 ; de Wil- 

 deman, 1. c. p. 133 ; Ostenfeld & Schmidt, 

 PI. f. the Red Sea, etc. p. 154; Cleve, 

 Pl. f. the Indian Ocean and the Malay 

 Archip. 1902, p. 18 and p. 55; non 

 VanHeurck, I.e. PI. 82, f . 4 ; nec Cleve, 

 Planktonundersökningar, Bih. t. K. S v. 

 Vet. Akad. Handl. B. 20, III, No. 2, 1894, 

 p. 14, Pl. II, 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. 



48. C. diversum Cleve, Diat. f. the Sea of Java 1873, p. 9, Pl. II, 

 f. 12; Leuduger-Fortmorel, I.e. p. 37; Van Heurck, I.e. PI. 81, f. 4; de 

 Wildeman, I.e. 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. II, f. 2; C. 

 diversum v. mediterranean Schröder, Phytopl. d. Golfes v. Neapel, Mitteil. 



Botanisk Tidsskrift. 25. Bind. 2 



