19 



l(rj - (3 (IT) - 10(+). 

 Area: Malay Archipelago. 



50. C. laeve Leud.-Fortm., 1. c. p. 38, PL 6, f. ± 



Leu (1 Li g e r - F r t m o r e 1 has 

 (in his treatise on the diatoms of 

 the Malay Archipelago) described 

 and figured two species of Chae- 

 toceras, viz. C. rude and C. laeve. 

 The first of those is only a form 

 of C. diversum Gieve, but the latter 

 distinct species of which I 



]s a 



here give a -figure; it is related 

 to C. diversum, but the thickened 

 intercalary awns are smooth and 

 of a characteristic curvature, first 

 being nearly parallel and then 

 abruptly turning off at a right angle. 

 Chromatophore a single plate in 

 front. Breadth of the cells 9 — 16y«. 



1 (+) - G (IT) - 10 (+). 



Area: Sea of Java. 



51. C. LoreDzianiim Grun., 



Verhandl. d. k. k. zool.-botan. Ge- 



sellsch., Wien 18G3, p. 157, Fl. 14, 



f. 13; Cleve, Diat. f. the Sea of 



.Java, 1873, p. 9 ; Leuduger-Fort- 



morel, 1 c. p. 37; de Wildeman, 



1. c. p. 134; Van Heurck, Synopsis 



PI. 82, f. 2; Cleve, Phytoplankton, 



p. 21, PI. I, f. 13-15; Schroder, 



1. c. p. 29 ; Cleve, PL L the Red 



Sea p. 1033 ; Ostenfeld & Schmidt, PL f. the Red Sea, etc. p. 154; Cleve, 



PL f. the Ind. Ocean and the Malay Archip. p. 19; Atl. Plankt. Organisms 



p. 306; C. cellidosum Lauder, Trans. Micr. Soc. 1864, p. 78, PL 8, f. 12; 



C. distans, forma setis evidentius punctatis Van Heurck, Syn. P. 82, L 4. 



Rather common: 1(4-) — 2 (rr) — 3 (rr) — 6 (rr) — 10(c). 



Area: Atlantic from North Sea southwards, Mediterranean, Red Sea, Gulf 

 of Aden, Indian Ocean, Malay Archipelago, Hongkong. 



52. C. paradoxiim Cleve, Diat. f. the Sea of .Java 1873, p. 10, PL 3, 

 L 16; PL f. the Ind. Ocean and the Malay Archip. p. 19 and p. 55; Leu- 

 duger-Fortmorel L c. p. 37, 



^1 (rr) - 10 (rr). 



Area: Malay Archipelago. 



9* 



Fig. 16. Chaetoceras laeve Leud.-Fortm. 



