414 



The hairs occur upon the external side of the cells in groups of 

 about two to six; the hairs are about 3 ju thick. 



Fig. 395 c, d shows tranverse sections of the epidermal cell- 

 layer of Dictyota in between which the Blastophysa is seen immersed; 



Fig. 395. Blastophysa rhizopus Rke. 



a, seen from above, b, plant from near the margin of Dictyota. 



c and d, transverse sections. 



(About 200: 1). 



in the one figure two cells are seen lying below the epidermal cells 

 of the Dictyota, in the other figure a single thicker cell is seen 

 between the cells of the Dictyota. 



The Dictyota was dredged in a depht of about 10 meters. 



St. Croix: off Frederikssted. 



