— 12 — 



1 (IT) - 2{r) - 3(-f) — 4 (IT) - ()(r) - 7 (it) - 10(+). 



Area: Tropical Atlantic, Mediterranean, Red Sea, Gulf of Aden, Malay 

 Archipelago, South-Indian and Pacific Oceans. 



31. R. robiista Norman, Pritch. Infus. 1861, p. 8G6, PL 8, f. 42; 

 Leuduger-Fortmorel, 1. c. p. 36 ; Cleve, Dial. f. the Sea of Java, 1873, p. 1 1 ; 

 Castracane, Ghalleng-er Rep., PI. 24, f, 5; Peragallo, Monogr. Rhiz., p. 109. 

 PI. II, f. 1, la, PI. Ill, f. 1, 2; Cleve, Pliytoplankton, p. 25; All. Plankt. 

 Organisms, p. 345 : PI. f. the Red Sea p. 1034 ; PI. f. the Indian Ocean 

 and Malay Archip. p. 23; Schroder, Neapel p. 25; Ostenfeld & Schmidt, 

 PI. f. the Red Sea, etc. p. 161. 



1 (rr) - ^2 (rr) - 3 (rr) — 6 (rr) — 8 (ri) - 10 (rr). 



Area: Tropical Atlantic Ocean, Mediterranean, Red Sea, Indian Ocean, 

 Malay Archipelago, Pacific Ocean. 



32. R. setigera Rtw., Microsc. Journ. 1858, p. 95, PL 5, L 7; Van 



Hearck, Synops. PL 78, f. 6-8; Peragallo, Monogr. Rhiz. PL 4, f. 15, 16, 

 non f. 12 — 14; Hensen, Fimfter Ber. Komm. Deutsch. Meere in Kiel, 1887, 

 PL V, f. 38a, b, c; Cleve, Fish. Board for Scotland 1896, p. 301, f. 12; 

 Grunow, Novara Exp. p. 28; Cleve, Diat. f. the Sea of Java p. 11; Atl. 

 Plankt. Organisms p. 347 ; PL f. the Ind. Ocean and the Malay Archip. 

 p. 23; Ostenfeld & Schmidt, Red Sea, p. 171 ; Lemmermann, 1. c. p. 317; 

 Leuduger-Fortmorel, 1. c. p. 36; de Wildeman 1. c. p. 123; B. japonica 

 Gastr., Challenger p. 72, PL 23, f. 7. 



The specimens are rather thin and delicate, about 8—10// broad. 



1(,) _ 2(rr) - 6(rr) - 7 (rr) - 10(+). 



Area: Atlantic Coasts of Europe and North of S.America, Mediteri'anean, 

 Red Sea, Indian Ocean, Malay Archipelago, Japan Sea, Pacific Ocean. — Neritic 

 species. 



33. R. Sliriibsolii Cleve, New Diatoms, 1881, p. 26; Van Heurck, 

 Synopsis, PL 79, f. 1 1 —13 ; Peragallo, Monogr. Rhiz. p. 114, PL 5, f. 8, 9 ; 

 Cleve, Phytoplankton p. 25; Atl. Plankt. Organisms p. 347 ; PL f. the Red 

 Sea, p. 1034; PL f. the Ind. Ocean and Malay Archip. p. 23; Schroder, 

 Neapel p. 26; Ostenfeld & Schmidt, PL L the Red Sea, etc. p. 161; 

 ?^. atlantica Peragallo. Monogr. Rhiz. p. 114, PL 5, f. 4 — 5. 



a (rr) — 6 (rr) - 10 (rr). 



Area: Atlantic Ocean in the Eastern part from the F;^roes southwards, 

 Mediterranean, Red Sea, Gulf of Aden, Indian Ocean, Malay Achipelago, Yeddo 

 Bay. 



34. R. Stolterfothii Perag., Diat. de Villefranche, p. 90, PL 6, f. 44; 

 Monogr. Rhiz. p. 108, PL 1, f. 17, 18; Cleve, Phytoplankton p. 25; Atl. 

 Plankt. Organisms p. 348; Ostenfeld & Schmidt, PL f. the Red Sea, etc. 



