Lauderia Cleve. 
15. I. annulata Cleve, Diat. f. the Sea of Java 1873, p.8, Pl. J, f.7; 
Peragallo, Monogr. du Genre Rhizosolenia (Le Diatomiste Vol. 1, 1892), 
p. 105, PI. 1, fig. 11; Castr., Challenger p. 89, Pl. VIII, f.7; Ostenfeld & 
Schmidt, Pl. from the Red Sea, etc. p. 158; Leuduger-Fortmorel, 1. c. 
p. 47; Gran, Nyt Magaz. Naturv. Kristiania, 1900, p. 109, PI. IX, f. 1-—4; 
Cleve, Pl. f. the Indian Ocean and the Malay Archip. p. 21; non Cleve, 
Phytoplankton PI. Il, fig. 18—15. 
Lar) — 3(+) — 4(rr) — 6(rr) — 100). 
_ Area: Red Sea, Gulf of Bengal, Malay Archipelago, Antarctic Ocean. 
Detonula (Schitt) Gran. 
16. D. delicatula (Perag.) Gran, Nyt Magaz. Naturv. 1900, p. 112; 
Lauderia delicatula Perag., Monogr. Rhiz. p. 105, Pl. i, f. 13; Cleve, 
Phytoplankton, p. 24, Pl. 2, f. 21; Schréder, Neapel p. 23, Pl. 1, f. 9a, b; 
Ostenfeld & Schmidt, Pl. f. the Red Sea, etc. p. 157. 
A species of Detonula which IJ refer with some hesitation to D. 
delicatula, has been found in some of the samples. 
1 (rr) — 6 (rr) — 10 (rr). 
Area: Tropical Atlantic Ocean, Mediterranean, Red Sea(?). 
17. D. Moseleyana (Castr.) Gran, Nyt Magaz. Naturv. 1900, p. 113; 
Ostenfeld & Schmidt, Plankt. from the Red Sea, etc. p. 157; Lauderia? 
Moseleyana Castr., Challenger Report, p. 90, Pl. 24, f. 9; Monogr. Rhiz., 
p. 105, Pl. 1, f. 10. 
2 (rr) — 38(rr). 
Area: Red Sea, Arafura Sea. 
Leptocylindrus Cleve. 
18. L. danicus Cleve, Kanonbaaden ,Hauch‘s Togter, Kjobenhavn, 
p. 54 (1879); Bih. t. Sv. Vet. Akad. Handl. XX, 3, No.2, p. 15, Pl. 2, 
f. 4,5; Schréder, Neapel, p.25; Cleve, Pl. f. the Red Sea, p. 1033; Pl. 
f. the Indian Ocean and the Malay Archip. p. 21; Atl. Plankt. Organisms 
p. 332. 
6(rr) — 10 (rr). 
Area: Eastern temperate Atlantic Ocean from Ferées and Norway south- 
wards to Spain, Mediterranean, Red Sea, Malay Archipelago. 
Dactyliosolen Castr. 
19. BD. antarcticus Castr., Challenger Report p. 75, Pl. 9, f. 7; Pera- 
gallo, Monogr. Rhiz. p. 104, Pl. 1, fig. 7; Cleve, Atl. Plankt. Organisms 
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