- 8 - 



p. 323 ; Pl. f. the S. Atlantic and the S. Indian Ocean p. 932 ; Pl. f. the 

 Indian Ocean and the Malay Archip. p. 21. 

 2 (it) - 6 (r). 



Area: Eastern and Northern Atlantic Ocean, Antarctic Ocean, South Indian 

 Ocean at 42°- 45° S. and 3° W. to 48° E. 



20. D. mediterraneus Perag., Monogr. Rhiz. p. 104, Pl. 1, f. 8, 9; 



Schröder, Neapel p. 24; Cleve, Pl. f. the S. Atl. and S. Ind. Ocean p. 932; 

 Pl. f. the Red Sea, Öfv. af K. Sv. Vetensk. Akad. Forhandl. 1900, No. 9 

 [1901], p. 1033; Atl. Plankt. Organisms p. 324; Pl. f. the Indian Ocean 

 and the Malay Archip. p. 21 ; Ostenfeld, Vid. Medd. Nath. For. Kjøbenhavn, 

 1898, p. 428; Ostenfeld & Schmidt, PI. f. the Red Sea, etc. p. 157. 

 2 (+) — 4 (rr) — 5 (rr) — 6 (+) — 7 (rr) — 10 (rr). 



Area: Temperate North Atlantic Ocean, Tropical Atlantic at Puerto Ga- 

 bello, Southern Atlantic and Indian Ocean at 42°— 44° S. and 3° W.— 48° E., 

 Mediterranean, Red Sea, Gulf of Aden, Gulf of Bengal, Malay Archipelago. 



Lauderiopsis Ostf. 



21. L. costata Ostf. in Ostenfeld & Schmidt, PI. f. the Red Sea, etc., 

 p. 158, f. 10. 



This genus forms a connecting link between Lauderia, Dactyliosolen 

 and Guinardia. 



2(r) - 6(+). 

 Area: Red Sea. 



Guinardia Perag. 



22. G. flaccida (Gastr.) Perag., Monogr. Rhiz. p. 107, Pl. 1, f. 3—5; 

 de Wildeman, 1. c. p. 1 22 ; Schröder, Neapel, p. 24 ; Ostenfeld & Schmidt, 

 Pl. f. the Red Sea etc., p. 158; Cleve, Atlant. Plankt. Organisms p. 328; 

 PI. f. the Indian Ocean and the Malay Archip. p. 21 ; Rhizosolenia? flac- 

 cida Castr. Challenger p. 74, PI. 29, f. 4. 



3(r) - 6 (rr) - 10 (rr). 



Area: Temperate Atlantic Ocean from Norway southwards to 16° N., Me- 

 diterranean, Red Sea, Arafura Sea, Malay Archipelago. 



Rhizosolenia (Ehbg.) Btw. 



23. R. alata Btw., Micr. Journ. 1858, p. 96, PI. 5, f. 7 ; Cleve, Diat. 

 f. the Sea of Java, 1873, p. 11; Leuduger-Fortmorel, I.e. p. 36; de Wil- 

 deman, I.e. p. 123; Grunow, Novara Exp. p. 28; Peragallo, Monogr. Rhiz. 

 p. 115, PI. 5, f. 11: Schröder, Neapel p. 26; Ostenfeld & Schmidt, Red 

 Sea p. 159; Cleve, Phytoplankton p. 24 ; Atlant. Plankt. Organisms p. 337 ; 

 Red Sea p. 1034; PI. f. the Atlant, and Indian Ocean p. 934; PI. f. the 

 Ind. Ocean and the Malay Archip. p. 22. 



