b K. OKAMURA. 



24. R. calcar avis Schultze ; Perag. Monogr. Rhiz. p. 18, PI. IV, f. 9, 

 10 ; Cleve Diat. f. Sea of Java p. 11; Atl. Plankt. Org. p. 339 ; PI. Ind. 

 Ocean and Malay Archip. p. 22; Ostf. in Schmidt Flora Koh Chang p. 

 228 ; Gran in Brandt u. Apst. Nord. PI. p. 54, f. 66 ; Karsten Ind. 

 Phytopl. p. 380, PI. XLI, f. 5, PI. XLII, f. 1. PI. X, fig. 24. 



Loc. : Prov. Tosa, Shinkawa (Prov. Mikawa). 



Area : Atlantic coasts of Europe, Africa and America ; Mediter- 

 ranean, Malay Archipelago, Pacific Ocean, Gulf of Siam. 



25. R. cochlea Brun ; Perag. Monogr. Rhiz. p. 18, t. IV, f. 11 ; Cleve, 

 PI. f. Ind. Ocean & Malay Archip. p. 22, p. 56, PI. 8, f. 12 ; Karsten 

 Ind. Phytopl p 381, t. XLI, f. 6 a-c ; R. calcar avis Schul. var. cochlea 

 (Brun) Ostf. in Schmidt's Flora Koh Chang p. 228, f. 5. 



PI, X, fig. 25. 

 Loc: Shirahama (Prov. Boshyu), Shinkawa (Prov. Mikawa). 

 Area : Indian Ocean, Malay Archipelago, Gulf of Siam. 



26. R. hehetata Bail. f. semispina (Hensen) Gran in Brandt u. Apst. 



Nord. Plankton p. 55. — R. semispina Hensen Bestim. Plankt. Kiel p. 



84, t. 5, f. 39 ; Cleve Rep. Phytopl. ' Research ' p. 300, f. 13. 



PI. IX, fig. 26. 

 Loc: Prov. Shima and Mikawa. 



Area: North Sea. — Oceanic form. 



27. R. alata Brightw. Perag. Monogr. Rhiz. p. 20, PI. V, f. 11 ; Ostf. 

 and Schmidt Red Sea, p. 159 ; Cleve Phytopl. p. 24 ; Atl. PI. Org. p. 

 337 ; Red Sea p. 1034 ; PI. Atl. and Ind. Ocean p. 934 ; Pi. f. Ind. 

 Ocean and Malay Archip. p. 22 ; Ostf. in Schm. Fl. Koh Chang p. 

 226. PI. IX, fig. 27. 



Loc: Cape Goza (Prov. Shima), Shirahama (Prov. Boshyu), Prov. 



Tosa, Prov. Mikawa. 

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

 Red Sea, Indian Ocean to 33°S, Malay Archipelago, Pacific Ocean 

 southwards to S. of New Zealand. 

 Among materials I have seen an abnormal specimen as illustrated in 

 PI. IX fig. d, the diameters of both parts of which measure 26 it and 50 

 ii respectively. 



Bacteriastruin Shadb. 



28. B. hyalinnm Lauder, Hongkong, p. 8, PI. 3, f. 7a, b ? ; Cleve PI. 

 Ind. 0. and Malay Archip. p. 18, p. 54 ; Ostf. in Schmidt's Flora of 

 Koh Chang p. 232, f. 9 ; Schroder Phytyl. Warm. Meer. p. 347, f. 

 10;— B. Minus Karst. Phyt. Atl. 0. p. 171, PI. 33, f. 21? Mangin 



I 



