11 



26. R. Clevei Ostf., n. sp. (sect. Squanwsae Perag.). 



Frustules large, 175 — 200 ;i broad; squamae 5 in cii-cuniference; 

 spine as in B. stpliforniis; lines of the connection-surface witli two 

 thickened parts for the basal part of the spine ; chromatophores 

 numerous, small. 



This interesting species is allied to 7?. Debj/dna Perag. It is the only 

 si)ecies besides li. sfi/IiforDi/s Blw.. which includes the peculiar Bichelia 

 iMracelJnlayis Schmidt (in Oslenfeld Sc Schmidt, PI. f. the Red Sea, 

 p. 146, f. 2). 



2 (it) — 5 (it) - 7(+) - 10 (it). 



27. R. cyliudnis Gleve, Phytoplankton 

 p. 24, 1^1. 2, f. 12; Atl, Plankt. Organisms 

 p. 341 ; Schroder, Neapel p. 26; Oslenfeld & 

 Schmidt, PI. f. the Red Sea, etc. p. 160. 



I have figured two frustules of a form 

 which I regard as R. cylinclrus Gl., although 

 the annulations are not quite like those 

 figured by Gleve. The chromatophores are 

 small. 



10 (r). 



Area: Tropical Atlantic Ocean, especially 

 in its Western parts, Gulf of Naples, Gulf of 

 Aden. 



Fisr. 7. Bhizosolenia cij- 



4 5 0, 



lindrus CI. (~t~)- 



28. R. fonnosa Perag., Diat. de Villefranche p. 91, PI. 6. f. 43, 

 Monogr. Rhiz. p. 110, PI. 2, f. 2; Gleve, PI. f. the Indian Ocean and the 

 Malay Archip. p. 23; Schroder, Neapel p. 25. 



3(rr). 



Area: Mediterranean, Malay Archipelago. 



29. R. hyalina Ostf. in Ostenfeld & Schmidt, PI. f. the Red Sea, 

 p. 160, f . 1 1 ; E. pellucida Gleve, PI. f. the Indian Ocean and the Malay 

 Archii)elago p. 23 and p. 56, PL 8, f. 4. 



2 (r;! - 8 (rrj - 10 (+). 



Area: Bed Sea, Gulf of Aden, Malay Archipelago. 



30. R. iinbricata Btw., Microsc. Journ. 1858, Vol. VI, p. 95, PI. 5, 



f, 6; Gleve, Diat. f. the Sea of Java p. 11; Van Heurck, Synopsis PI. 79, 

 f. 5, 6; Peragallo, Monogr. Rhiz. p. 113, PI. 5, f. 2, 3; Schroder, Neapel 

 p. 26; Ostenfeld & Schmidt, PI. t. the Red Sea etc. p. 161; Gleve, PI. f. 

 the Indian Ocean and the Malay Archip. )). 23; R. siriata Grev.. Diat. 

 South Pacif. Ill, p. 334, PI. 3, f. 4 ; Peragallo, 1. c. p. 114, PI. 5. f. 1: 

 Leuduger-Fortmorel 1. c. p. 36. 



