_ 4 — 



!2(iT) - 6 (it). 



Area: Found in ;ill the Oceans, mostly along the coasts. 



G. 0. Janischii A. Schmidt, Atl. d. Dial. Kunde, PL 04, f. 3, 4. 

 Rattray, Goscinodiscus, p. 543 and v. arafurensis p. 544 ; Grunow, Denksch. 

 d. Wiener Akad. d. Wissensch. 1884, p. 76; C. arafurensls var. nov. Gastr., 

 Ghallenger Report, Botany, Vol. II, 1886, p. 153, PI. 2, f. 4; C. craspedo- 

 discus Gastr. ibid. Pi. 3, f, 5; C. Janischii Gleve, PL L the Indian Ocean 

 and the Malay Archip. p. 20. 



3(rr) — 10 (it). 



Area: Gnlf of Bengal, Malay Archipelago, Arafura Sea. 



7. C. nobilis Grun., Jotirn. Roy. Microsc. Soc. 1879, p. 687, PL 1, 

 f. 1; Leuduger-Fortmorel, L c. p. 45; Rattray, Go.scinodiscus, p. 545; Gleve, 

 PL f. the Ind. Ocean and the Malay Archip. p. 20 and p. 56; C. pcvpnannf> 

 Gastr., Ghallenger Report p. 154, PL 3, f. 3. 



The form observed resembles very much C. p)(tpuanus Gastracane 

 I.e.; it is about 250 — 300^ in diameter; and I am following Professor 

 Gleve in regarding C. 2)a2)iian'ns as a form of C. nohiJis. 



3 (-L) - 10 (rr). 



Area: Great Britain. Gulf of Guinea, Malay Archipelago, Arafura Sea, 

 South China Sea. 



8. (!. ociihis iridis Ehbg., Abhandl. Berl. Akad. 1839, p. 147; G. 

 centralis var. nov., Gastr., Ghallenger, PL 2, fig. 3. 



A form which agrees very well with the that figured by Gastracane 

 1. c, was found sparingly in one of the samples. 



3 (rr). 



Area: Found in all Oceans. 



9. C. radiatiis Ehbg., Abhandl. Berl. Akad. 1839, p. 148, PL 3, L 1 a-c. 



Forms, which I refer to this species, were found rather sparingly in 

 most of the samples. 



2(r) — 3(rr) — 4 (rr) - G (rr) - 7 (rr) - 10 (rr) 



Area: Found in all Oceans. 



Palmeria Grev. 



10. P. Hardmaniana Grev., Van Heurck, Treatise on the Diatomaceae 

 1896, p. 538, f. 286; Gleve, PL f. the Indian Ocean and the Malay Archip. 

 p. 22 and p. 56. 



The interesting form of which I have given some figures, belongs 

 to the genus Palmeria and I prefer identifying it with the only known 

 species P. Hardmaniana, although the figure by Van Heurck is rather 

 different. My specimens are very delicate, 500 — 650 ii. long and 250— 



