DAA, 26 
There is no doubt that this species having two processes on each 
valve belongs to the genus Cerataulina, and Cleve has also indicated 
two in his figure 7a, so that I do not understand his reasons for taking 
it as a Rhizosolenia. 
2 (rr) — 3(-+). 
Area: Red Sea, Malay Archipelago. 
Hemiaulus Ehbg. 
73. 4H. chinensis Grev. Ann. Magaz. Nat. Hist. XVI, p.5,-Pl. 5, f. 9, 
1865; H. Heibergii Cleve, Diat. f. the Sea of Java, 1873, p.6, Pl. 1, f.7; 
Leuduger-Fortmorel, 1. c. p. 41; Cleve, Pl. f. the Red Sea, p. 1033; Pl. f. 
the Indian Ocean and the Malay Archip. p.21; Atl. Plankton Organisms 
p- 329. 
Professor Cleve informs me in a letter that his H. Heibergii is 
identical with H. chinensis of Greville. 
6 (rr) — 10(+). 
Area: Tropical Atlantic Ocean, Red Sea, Indian Ocean, Malay Archipelago, 
Arafura Sea, Japan and China Seas. 
B. Pennatae. 
Fragilarieae. 
Thalassiothrix Cleve & Grun. 
74. TT. Vrannfeldii Grun. in Cleve & Grunow, Arctische Diatomeen, 
K. Sv. Vet. Akad. 17, No. 2, 1880, p. 109; de Wildeman, 1. c. p. 104; 
Castracane, Challenger Report p.54—55, Pl. XIV, f.7,8 (inel. 7. curvata 
Castr., Pl. XXIV, f. 6); Schréder, Neapel p. 31; Cleve, Phytoplankton p. 25; 
Atl. Plankt. Organisms p. 356; Ostenfeld & Schmidt, Pl. f. the Red Sea, 
ete. p. 162; Van Heurck, Synopsis Pl. 37, f.11—15; Asterionélla Fraun- 
feldii Grunow, Verh. zool.-bot. Gesellsch. Wien 1 863, p. 140, Pl. 14, f. 18; 
Cleve, Diatoms of the Sea of Java 1873, p. 12. 
I should think that all the specimens belong to the var. javanica 
Grun. in Van Heurck, 1. c. f. 13. ; 
1(+) — 2@) — 3(rr) — 6) ~ 7%) — 10(4). 
Area: Atlantic Ocean, Mediterranean, Red Sea, Indian Ocean, Malay Ar- 
chipelago, Ghina Sea, Japan Sea, Pacific Ocean. 
75. T. longissima Cleve & Grunow, 1. c. p. 108; Ostenfeld & Schmidt, 
Pl. f. the Red Sea, etc. p. 162 (f. gracilis Ostf.); Cleve, Phytoplankton 
p. 25; Atl. Plankt. Organisms p. 357; Pl. f. the S. Atlantic and the S. 
Indian Ocean p. 935; Pl. f. the Red Sea, p. 1035; Pl. f. the Indian Ocean 
