18 CLEVE, PLANKTON FROM THE INDIAN OCEAN AND THE MALAY AUCHIPELAGO. 



Bacteriastrum hyalinum Laudee. Malay Archip., July, September, cotnrnon in some 

 samples {t. 27,7, inean of 7 obs. max. 28, 70, min. 25,6; s. 32,57, max. 33,76, min. 31,62). 



Bacteriastrum varians Lauder. Malay Årchip., May to September, c. {t. 28, i, mean 

 of 6 obs. max. 29,35, min. 25,3; s. 32,28, max. 33, 06, min. 31,98). 



Bellerochea malleus (Brightw.). Malay Archiii., September, Gaspar Sound. rr. {t. 



28,35 to 28,50 ; s. 31,62 to 32,22). 



Chaetoceros apquatorialis Cl. Malay Archij:)-, Semau Sound, July, rr. 



Chsetoceros atlanticus Cl. S. Indian Ocean, 45° — 43° S. 26° — 73° E., more or less 

 rare {t. 8,5, mean of 4 obs., max. 14, min. 6,4; s. 34,34, max. 35,25, min. 33,93). 



Chaetoceros Anrivillii Cl. n. sp. Malay Archip., Semau Sound, July, rr. {t. 25,7; 

 c«. 33,76), Gaspar Sound, September rr. {t. 28,5; s. 32,43). 



Chaetoceros borealis Btvv. S. Indian Ocean, 44° S. 43° E., rr. {t. 6,4; s. 34, 12). 



Chaetoceros brevis Schutt. (C. didynius? hiemalis Cl., C. hiemalis Cl.). Malay 

 Archip., Flores, June (t. 26,2; .?. 33, so), Semau Sound, July. 



Chaetoceros calvus Cl., n. sp. Malay Archip., May to September, not rare {t. 27.2, 

 mean of 8 obs. max. 29, min. 25,3; s. 32,88, max. 33,88, min. 31,8i). 



Chaetoceros coarctatns Lauder. Arabian Sea, 12° N. 47° E. Indian Ocean 4° N. 

 81° E. Malay Archip., June to September, common {t. 29,9, mean of 7 obs. max. 28,43, 

 min 25,6; s. 33, 12, max. 33,88, min. 31,62). 



Chaetoceros compressus Lauder, Malay Archip., September, -\- {t. 28, 50 to 29; s. 

 31,98 to 32,43). 



Chaetoceros criophilus Castr. S. Indian Ocean, 44° S. 48° E., r. {t. 6,8; s. 33,93). 



Chaetoceros curvisetus Cl. Malay Archip., May to September, in some samples 

 common (t. 25,3 to 28,5; s. 32,43 to 33,88). 



Chaetoceros densus Cl. Malay Archip., June to September, r. {t. 26,2 to 29; s. 31,98, 

 to 33,8o). 



Chaetoceros denticulatus Lauder. Malay Archip)., June, July r. {t. 25,7 to 26,2; s. 

 33,76 to 33,8o). 



Chaetoceros tlichaeta Ehb. S. Indian Ocean, 45° S. 34° E., + {t. 6,4; s. 34, 07). 



Chaetoceros distans Cl. Malay ArcJiip., June, September, r. {t. 28,35 to 28, 70; s. 

 32,43 to 33,06). 



Chaetoceros diversus Cl. Malay Archip-, June to September, -|- {t. 28,7, mean of 

 5 obs. max. 29,35, min. 28,35; s. 32, 20, max. 33, oe. min. 30,84). 



Chaetoceros (atlanticus var.) exigmis Cl. (C nmpo/fton^is Schröder). S. Indian Ocean, 

 45°— 44° S. 29°-43°E. (t. 6,4—8,2; s. 34,12—34,28). Malay Archip., June, July, r. {t. 

 25,7—26,2; ,s-. 33,76 to 33,8o). 



Chaetoceros furca Cl. Arabian Sea, 12°— 11°N. 46°— 5 TE. Malay Archip,, May 

 to July {t. 25,9, mean of 5 obs. max. 26, s, min. 25,3; s. 33,62, max. 33, 8s, min. 32,94). 



