— 20 — 



53. C. peruvianum Btw., Microsc. Journ. 1856, p. 107, PI. 7, f. 16 

 — 18; Cleve, Fish. Board for Scotland, 1896, p. 299, f. 7; Leuduger-Fort- 

 morel, 1. c. p. 37 ; Cleve, Pl. f. the Indian Ocean and the Malay Archip. 

 p. 19; PI. f. the S. Atlantic and the S. Indian Ocean, p. 929 ; PI. f. the 

 Red Sea p. 1033; Lemmermann I.e. p. 317. 



This species is very variable; several new species have been described 

 upon forms of it, but it seems incorrect to me to give them specific 

 range. I should think they are to be arranged in three groups after their 

 coarseness and size, viz. : 



f. 1, volans (Schütt). Rather slender, awns rather thin: C. volans 

 Schütt, Ber. d. Deutsch. Botan. Gesellsch. 1895, f. 20, C. currens Cleve, 

 Fish. Board for Scotland, p. 299, f. 8. Arctic and northern Atlantic form. 



f. 2, typica. Intermediate between 1 and 3; C. peruvianum Btw. 

 I.e.; Cleve, I.e. p. 299, f . 7 ; Schröder, Neapel p. 29, Pl. 1, f. 4 (f. gra- 

 cilis). Tropical parts of the Oceans. 



f. 3, robusta Cleve. Coarse and with coarse awns. C. peruvianum 

 v. robustum Cleve, Diat. f. the Sea of Java, 1873, PI. 2, f. 8; C. boréale? 

 Lauder, Transact. Microsc. Soc. Vol. 12, 1863, PI. 7, f. 7; C. robustum Ostf. 

 in Ostenfeld & Schmidt, PI. f. the Red Sea, etc. p. 145; C. curvatum Castr., 

 Challenger Report p. 78. 'Tropical and Antarctic parts of the Oceans. 



f. 2: 1 (rr) - 2 (rr) - 3 (rr) - 6 (r). 

 f. 3: 1 (rr) - 10(+). 



Area: Arctic and Atlantic Ocean, Mediterranean, Red Sea, Indian Ocean, 

 Malay Archipelago, China Sea, Pacific Ocean, Antarctic Ocean. 



54. C. pseudocrinitum Ostf., Nyt Magaz. Naturv., Kristiania, 1901, 

 p. 300, f. 1 1 ; C. crinitum Gran, Norske Nordhavs Expedition, Protophyta 

 1897, p. 22, PL 4, f. 51, non Schütt, 1895. 



This little species which I have described from Danish waters and 

 which Gran has found on the Norwegian coasts, was also met with in 

 the Gulf of Siam, but sparingly. 



10 (rr). 



Area: Limfjord, Kattegat, Coast of Norway. 



55. C. Ralfsii Cleve, Diat. f. the Sea of Java 1873, p. 10, PI. Ill, 



f. 15; Leuduger-Fortmorel, 1. c, p. 37; de Wildeman, 1. c. p. 134; Cleve, 

 Pl. f. the Indian Ocean and the Malay Archipelago, p. 19 and p. 55; non 

 Van Heurck, Syn., Pl. 82 bis, f. 3. 



The chromatophore is solitary and in front. 



2(rr) - 6(rr). 



Area: Malay Archipelago. 



56. C. rostratum Laud., Trans. Microsc. Soc. 1864, p. 79, PI. 8, 

 f. 10; Cleve, PL f. the Ind. Ocean and the Malay Archip. p. 19 ; Ostenfeld 

 & Schmidt, PL f. the Red Sea, etc., p. 155. 



