386 



cells in the middle, of irregularly shaped, tri-polygonal cells with 

 elongated corners; from these cells short, several times forked, 

 moniliform filaments emerge, these being composed of small oval 

 cells (Fig. 370 a, b}. The cells in the filaments are about 67 // 

 thick. 



The consistency of the thallus is very gelatinous. 



I have referred this doubful plant to Gloiocladia as it, to a 

 great extent, bears a close resemblance to this genus. Of Gloio- 



Fig. 370. Gloiocladia spec. 



a, transverse section of the thallus (about 80:1); b, part of the same more 

 magnified (ahout 300:1); c, cells from the middle of the thallus seen from 



above (about 300:1). 



cladia a single representative, G. furcata from the Mediterranean 

 Sea, is known up to the present time (compare ZANARDINI, Ico- 

 nographia Phyc. Adriat., vol. I, p. 13, pi. 4 A). When compared 

 with this plant the West Indian one differs nevertheless in several 

 respects. Thus it must be pointed out that its thallus is broader 

 and flat throughout its whole length and the upper ends of the 

 thallus are obtuse. 



As to the anatomical structure the most essential difference 

 between the two plants is that while the tissue in the interior 

 of the thallus in my plant consists mostly of a single layer only, 

 in the Mediterranean plant with its thicker thallus this tissue 

 is composed of several layers. 



Hence, it is most probable, we have to do with a new spe- 



