930 12 
1(rr) — 2(r) — 3(+) — 4(rr) — 6(r) — 7(rr) — 10(+4+). 
Area: Tropical Atlantic, Mediterranean, Red Sea, Gulf of Aden, Malay 
Archipelago, South-Indian and Pacifie Oceans. 
31. MR. robusta Norman, Pritch. Infus. 1861, p. 866, Pl. 8, f. 42; 
Leuduger-Fortmorel, 1. c. p. 36; Cleve, Diat. f. the Sea of Java, 1873, p. 11; 
Castracane, Challenger Rep., P]. 24, f.5; Peragallo, Monogr. Rhiz., p. 109, 
Pl. Il, f. 1, fa, Pl. Ill, f. 1, 2; Cleve, Phytoplankton, p.25; Atl. Plankt. 
Organisms, p. 345; Pl. f. the Red Sea p. 1034; Pl. f. the Indian Ocean 
and Malay Archip. p. 23; Schréder, Neapel p. 25; Ostenfeld & Schmidt, 
Pl. f. the Red Sea, etc. p. 161. 
1 (rr) — 2(rr) — 3(rr) — 6 (rr) — S(rr) — 10 (rr). 
Area: Tropical Atlantic Ocean, Mediterranean, Red Sea, Indian Ocean, 
Malay Archipelago, Pacific Ocean. 
32. R. setigera Btw., Microsc. Journ. 1858, p. 95, Pl. 5, f. 7; Van 
Heurck, Synops. Pl. 78, f.6—8; Peragallo, Monogr. Rhiz. Pl. 4, f. 15, 16, 
non f.12—14; Hensen, Fiinfter Ber. Komm. Deutsch. Meere in Kiel, 1887, 
Pl. V, f. 38a, b, ¢; 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, ].c. p. 317; 
Leuduger-Fortmorel, 1. c. p. 36; de Wildeman |. c. p. 123; RB. japonica 
Castr., Challenger p. 72, Pl. 23, f. 7. 
The specimens are rather thin and delicate, about 8—10,y broad. 
1(r) — 2(rr) — 6 (rr) — 7 (rr) — 10(-+). 
Area: Atlantic Coasts of Europe and North of S. America, Mediterranean, 
Red Sea, Indian Ocean, Malay Archipelago, Japan Sea, Pacific Ocean. — Neritic 
species, 
33. NR. Shrubsolii Cleve, New Diatoms, 1881, p. 26; Van Heurck, 
Synopsis, Pl. 79, f.11—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; Schréder, 
Neapel p. 26; Ostenfeld & Schmidt, Pl. f. the Red Sea, etc. p. 161; 
?R. atlantica Peragallo, Monogr. Rhiz. p. 114, Pl. 5, f.4—5. 
Arr) — 6 (rr) — 10 (rr). 
Area: Atlantic Ocean in the Eastern part from the Frrées southwards, 
Mediterranean, Red Sea, Gulf of Aden, Indian Ocean, Malay Achipelago, Yeddo 
Bay. 
34, KR. 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. 
