58 



CLEVE, PLANKTON FKOM THE INDIAN OCEAN AND THE MALAY ARCHIPELAGO. 



Fragilaria (?) rhombica n. sp. 



(Pl. VIII, fig. 8). 



Valve elongated rhorabic; sagittal axis 0,o6, transverse axis 0, 009 rara. Striti? pervious, 

 parallel, obscnrely punctate, 15 in 0, 01 min. They are fainter in the middle of the valve 

 where are some silicious concretions. 



Malay Archipelago, Bali Sound. 



Licmophora Aurivillii Cl. 



Fig. 2. 



sp. 



ö 



Fig. 2. Licmophora Aurivillii. 



a. Valve 80 t. m. — 6. End of the 



frustule in zonal view. 1000 t. m. 



— c, d. Upper and lower end of 



the frustule, 450 t. m. 



Frustules very slender, their sagittal axis 0,8 mm., tliin- 

 walled. The distal part of the valve (transverse axis 0,02 mm.) 

 three times broader than the very narrow proximal part. The 

 valve has a distiiict median line and very fine and close, but 

 sharp stria3 (at least 28 in 0,oi mm.). Zone is narrow, occu- 

 pies a third of the frustule (in zonal. view.), has no septa, but 

 close longitudinal division-lines (12 in 0,oi mm.). Chromatophores 

 numerous, small, rounded and scattered without order. 



Malay Archipelago, Semau Sound, July. 



Sceptroneis Aurivillii Cl. n. sp. 



(1'1. VIII, tig. i)). 



Valve slender, gibbous in the raiddle and with broad 

 truncate end. Sagittal axis 0,4 mm., transverse axis 0, 012 mm., 

 where the valve is broadest. Stria^ distinctly punctate, 8 to 9 in 

 0,01 mm., not pervious, the valve having a central narrow axial 

 area. Stria3 in the distal end radiate and fainter. 



Malay Archipelago, Bali Sound. 



Striatella Lindigiana Gkun. 



The chromatophores of this species are elongated and 

 crowded around the central nucleus. 



