— 4 — 



2 (it) — 6 (rr). 



Area: Found in all the Oceans, mostly along the coasts. 



6. C. Janischii A. Schmidt, Atl. d. Diat. Kunde, Pl. 64, f. 3, 4. 



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

 d. Wiener A kad. d. Wissensch. 1884, p. 76; C. arafurensis var. nov. Castr., 

 Challenger Report, Rotany, Vol.11, 1886, p. 153, PI. 2, f. 4; C. craspedo- 

 discus Gastr. ibid. PI. 3, f. 5; C. Janischii Cleve, Pl. f. the Indian Ocean 

 and the Malay Archip. p. 20. 



3 (it) — 10 (it). 



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



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

 f. 1; Leuduger-Fortmorel, I.e. p. 45; Rattray, Goscinodiscus, p. 545; Cleve, 

 Pl. f. the Ind. Ocean and the Malay Archip. p. 20 and p. 56; C. papuanus 

 Castr., Challenger Report p. 154, PI. 3, f. 3. 



The form observed resembles very much C. papuanus Castracane 

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

 Cleve in regarding C. papuanus as a form of C. nobilis. 



3(+) - 10 (rr), 



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

 South China Sea. 



8. C. oculus iridis Ehbg., Abhandl. Berl. Akad. 1839, p. 147; C. 

 centralis var. nov., Castr., Challenger, PI. 2, fig. 3. 



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

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



3 (rr). 



Area: Found in all Oceans. 



9. C.radiatus Ehbg., Abhandl. Berl. Akad. 1839, p. 148, PI. 3, f. 1 a-c. 



Forms, which I refer to this species, w T ere found rather sparingly in 

 most of the samples. 



2 (r) - 3 (rr) — 4 (rr) - 6 (rr) - 7 (rr) - 10 (rr) 

 Area: Found in all Oceans. 



Palmeria Grev. 



10. P. Harri mania na Grev., Van Heurck, Treatise on the Diatomaceae 

 1896, p. 538, f. 286; Cleve, 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 w T ith the only known 

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

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



