THE KOBTII ATLANTIC OCEAN. 



459 



Fig. 4 shows part of a filament, highly magnified ; two spores and the 

 intervening cells above mentioned are represented. 



ScHizosiPHON OBSCURUM, D. sp. Filaments straight, shorter than 

 the sheath, gradually attenuate upwards from the large subsphcrical 

 basal cell, usually torulose throughout; sheath distinct, obscurely 



lameliose. 

 Forming a thin stratum on drift wood; filaments generally about 

 •001 of an English inch in length, but variable in that respect (Fig. 5). 



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