9 — 



2 (rr) - 10 (rr). 



Area: Atlantic Ocean from N. of Iceland to 41° S., Mediterranean, Red 

 Sea, Indian Ocean to 33° S., Malay Arcliipelago,_ Pacific Ocean .soutliwardri to S. 

 of New Zealand. 



R. alata Btw. var. gracillima (Gl.) Van Heurck, Synopsis, PI. 7"J, f. 8, 

 10; Peragallo, Monogr. Pvhiz. i). 115, PI. 5, fig. 12; Ostenfeld ct Schmidt, 

 PL f. the Red Sea, etc. p. KiO; Gleve, PI. f. the 

 Red Sea p. 1034; All. Plankt. Organisms, p. 34:2; 

 PI. f. tlie Indian Sea and the Malay Archipelago 

 p. :23 ; 7?. (jracillima Gleve, New Diatoms, K. Sv. 

 Vet. Akad. Hand). Bd. 18, 5, 1881, p. 26, PL VI, 

 f. 78; Phytoplankton j). 24; Schroder, Neapel, 

 p. 2(5. 



2(rr) - 4(rr) - 10 (r). 



Area: Most parts of the Atlantic Ocean, Medi- 

 terranean, Red Sea, Gulf of Aden, Malay Archipelago. 



Fig. 3. 



Rhizosolenia alata Btw. 

 var. indica (Perag.) Ostf. 



Two cells with different 

 directions of the calyptra. 



U. ali\ta Btw. var. indica (Perag.) Ostf. in 

 Ostenfeld & Schmidt, PL f. the Red Sea, etc. p. 1 60 ; 

 R. indica Peragallo, Monogr. Rhiz. p. 116, PI. 5, 

 f. 1 6 ; R. alata v. corpulenta Gleve, Phytoplankton 

 p. 24, PL 2, f. 11; Atl. Plankt. Organisms p. 340; 

 R. corpulenta Gleve, PL of the Ind. Ocean and 

 Malay Archip. p. 22; R. quadrijuncta Peragallo, 

 Monogr. Rhiz. p. 116, PL 5, f. 17. 



Gertainly the R. indica and R. quadrijuncta 

 of Peragallo belong to the same species and this 

 is I'lU'ther identical with the var. corpulenta of 

 Gleve. I have given two sketchs of the calyptrae, 

 showing different directions of the upper part. 



l(n-) - ^2(rr) - 3 (rr) - 1()(+). 



Area: Tropical and Subtropical Atlantic, Red 

 Sea. Gulf of Aden, Indian Ocean, Malay Archipelago, 

 Yeddo Bav. 



24. R. ainiiiitata Ostf., n. sp. (sect. Squa- 

 mosae Perag.). 



Fntstules large, 80—100 fj. broad; val- 

 ves (calyptras) long-conic; sqiiamtt; 5 in cir- 

 einnterence; spine transversely cut off, with 

 an excavation at the apex and a cavity in 

 the lower part. Ghroniato])hores numerous, 



of a cell {—T'), c the apex 

 Allied to R. arafurensis Gastr. (Ghallenger showing the form of the 



a 



Fig. i. 



Rhizosolenia aniputata Ostf. 

 a a whole cell (—), h part 



2 00 ^ 

 1 



Report, p. 74, PL 30, f. 12; Peragallo, Monogr. 



4 fi 0. 



spme (-T-) 



