bo 
iS) 
le) 
11 
26. KR. Clevei Ostf., n. sp. (sect. Squamosae Perag.). 
Frustules large, 175—200 » broad; squamee 5 in circumference; 
spine as in R. styliformis; lines of the connection-surface with two 
thickened parts for the basal part of the spine; chromatophores 
numerous, small. 
This interesting species is allied to R. Debyana Perag. It is the only 
species besides FR. styliformis Btw., which includes the peculiar Richelia 
intracellularis Schmidt (in Ostenfeld & Schmidt, Pl. f. the Red Sea, 
p. 146, f. 2). 
Q(rr) — 5(rr) — 7 (+) — 10(rr). 
27. KR. eylindrus Cleve, Phytoplankton 
p- 24, Pl. 2, f. 12; Atl.” Plankt. Organisms 
p. 341; Schréder, Neapel p. 26; Ostenfeld & 
Schmidt, Pl. f. the Red Sea, ete. p. 160. 
I have figured two frustules of a form 
which I regard as &. cylindrus Cl., although 
the annulations are not quite like those 
figured by Cleve. The chromatophores are 
small. 
10 (r). 
Area: Tropical Atlantic Ocean, especially 
in its Western parts, Gulf of Naples, Gulf of Fig. 7. Rhizosolenia cy- 
Aden. : lindrus Cl, (42%), 
afar 
28. RR. formosa Perag., Diat. de Villefranche p. 91, Pl. 6, f. 43, 
Monogr. Rhiz. p. 110, Pl.2, f.2; Cleve, Pl. f. the Indian Ocean and the 
Malay Archip. p. 23; Schréder, Neapel p. 25. 
3 (rr). 
Area: Mediterranean, Malay Archipelago. 
29, R. hyalina Ostf. in Ostenfeld & Schmidt, Pl. f. the Red Sea, 
p. 160, f. 11; RB. pellucida Cleve, Pl. f. the Indian Ocean and the Malay 
Archipelago p.23 and p. 56, Pl. 8, f. 4. 
A(r) — 3(rr) — 10(+). 
Area: Red Sea, Gulf of Aden, Malay Archipelago. 
30. It. imbricata Btw., Microsc. Journ. 1858, Vol. VI, p. 95, Pl. 5, 
f.6; Cleve, Diat. f. the Sea of Java p. 11; Van Heurck, Synopsis Pl. 79, 
f.5,6; Peragallo, Monogr. Rhiz. p.113, Pl. 5, f. 2,3; Schréder, Neapel 
p. 26; Ostenfeld & Schmidt, Pl. f. the Red Sea etc. p.161; Cleve, Pl. f. 
the Indian Ocean and the Malay Archip. p. 23; &. striata Grev., Diat. 
South Pacif. IH, p. 334, Pl. 3, f. 4; Peragallo, l.c. p.114, Pl. 5, f. 1; 
Leuduger-Fortmorel 1. c. p. 36. 
