I IO 



enough to me, even though I could not make out to what species this okl plant belonged 

 or whether it is new to scieni 



rhe plant figured in PI. XVI, fig. 17 is from Ambon; it shows periods of intra-nodal 

 growth so exactly like what one observes in the recent Amphiroa fragilissima PI. XVI, hg. 19 

 th a t I do not hesitate to range the fossil alga near that species, even though a node is not 

 visible in the section. A. fragilissima is very variable, being slender or coarser in various stages 

 of development; the ahnost horizontal rows of cells that build np its central strand are 

 however so characteristic that I feel almost sure that the plant of Ambon, which has fairly 

 horizontal rows, belongs to A. fragilissima. 



In a section from Cape Haharu near the mouth of the Tami-River, New Guinea 

 N . 734, that 1 received trom Prof. Wichmann at Utrecht, I found this same Amphiroa and 

 also another species. This last one was coarser than the former and the rows of cells in its 

 central strand were decidedly curved. I think it very probable, that this is A. fo/iacca. a 

 speeies much resembling A. fragilissima in the anatomical structure of the frond. In the absence 

 of nodes and conceptacles the determination of both species is however liable to controversy. 



In a section from the Island Karas on the western coast of New Guinea, I detected also 

 an Amphiroa spec. This section was therefore interesting because, as Prof. Wichmann told me 

 in a letter, the layer from which it came, certainly dated from the eocene. 



