938 20 
53. ©. 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, l.c. p.37; Cleve, Pl. f. the Indian Ocean and the Malay Archip. 
p.19; Pl f. the S. Atlantic and the S. Indian Ocean, p. 929; Pl. f. the 
Red Sea p. 1033; Lemmermann |. c. 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 (Schiitt). Rather slender, awns rather thin: C. volans 
Schiitt, Ber. d. Deutsch. Botan. Gesellsch. 1895, f.20, C. currens Cleve, 
Fish. Board for Scotland, p. 299, f. 8. Arctic and northern Atlantie form. 
f. 2, typica. Intermediate between 1 and 3; C. peruvianum Btw. 
l.e.; Cleve, lc. p.299, f.7; Schréder, 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, Pl. 2, f. 8; C. boreale? 
Lauder, Transact. Microsc. Soc. Vol. 12, 1863, Pl. 7, f.7; C. robustum Ost. 
in Ostenfeld & Schmidt, Pl]. f. the Red Sea, ete. p. 145; C. eurvatwm Castr., 
Challenger Report p. 78. Tropical and Antarctic parts of the Oceans. 
f..2: 1(rr) — 2(rr) — 3 (rr) — 6 (2). 
f. 3: 1 (rr) — 10(4). 
Area: Arctic and Atlantic Ocean, Mediterranean, Red Sea, Indian Ocean, 
Malay Archipelago, China Sea, Pacific Ocean, Antarctic Ocean. 
54. . pseudocrinitum Ostf., Nyt Magaz. Naturv., Kristiania, 1901, 
p- 300, f.11; C. erinitum Gran, Norske Nordhays Expedition, Protophyta 
1897, p. 22, Pl. 4, f.51, non Schiitt, 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. €. Ralfsii Cleve, Diat. f. the Sea of Java 1873, p.10, Pl. IU, 
f. 15; Leuduger-Fortmorel, 1. c, p.37; de Wildeman, 1. ¢. 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. 
(er) — 6 (rr). 
Area: Malay Archipelago. 
56. (. rostratum Laud., Trans. Microsc. Soc. 1864, p. 79, Pls. 
f. 10; Cleve, Pl. f. the Ind. Ocean and the Malay Archip. p. 19; Ostenfeld 
& Schmidt, Pl. f. the Red Sea, etc., p. 155. 
