17 



I regard the C. Kellerl Brun which 

 was found in oysters from Japan as 

 identical with the C. couipressum Lauder, 

 and 1 have given a figure of the coarse, 

 tvisted awns of C. compressuni in order 

 to show this identity. 



] (rr) — 2 (r) - 3 (rr) - (i (rr) — 10 (c). 



Area: Red Sea, Malay Archipelago, 

 Hongkong. — Neritic species. 



Fig. 12. 

 CJtaefoceras comiiressum Laud. 

 Cell with twisted coarse awns, 

 in side view ( ^ J. 



46. C. didyiiiuiii Ehbg. (1845); 

 Clave, Bih. t. Sv. Vet. Akad. Hand]. 



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

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

 Atl. Plankt. Organisms p. 301 ; Schroder, Neapel p. 27 ; C. j^t'otuberans 

 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. €. distans Cleve, Diat. f. the 

 ;Sea of Java 1873, p. 9, PL 11, f. 1 1 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, 

 PI. f. the Indian Ocean and the Malay 

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

 VanHeurck, I.e. PL 82, f. 4; nee Cleve, 

 Planktonundersokningar, Bih. t. K. Sv. 

 VeL 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 (IT) - 10(+). 



Area: Malay Archipelago, Red Sea. 



Fig. 13. Chaetoceras distans CI. 

 Chain with chromatophores. 



48. C. diversuiii Cleve, Diat. f. the Sea of Java 1873, p. 9, PL II, 

 L12; Leuduger-Fortmorel, I.e. p. 37; Van Heurek, I.e. PL 81, f. 4; de 

 Wildeman, I.e. p. 133; Cleve, Atl. Plankt. Organisms, p. 302; Plankt. f. 

 the Ind. Ocean and tlie Malay Archipelago p. 18; Plankt. f. the Red Sea 

 p. 154; C. diversum v. tetmis Cleve, Phytoplankton p. 21, PL II, f. 2; C. 

 diversum v. mediterranea Schroder, Phytopl. d. Golfes v. Neapel, Mitteil. 



Botanisk Tidsskrift. 25. Bind. 2 



