184 — 



The membrane of this rather large species consists of several 

 cell-layers; innermost the cells are large becoming smaller and 

 smaller towards the surface where we find a layer of small roun- 

 dish bark-cells quite covering the underlying cells (Fig. 3 B.). 



Here and there on the inside of the membrane towards the hollow 

 in the middle of the thallus a single one of the big membrane-cells or 

 some few in rows bear glands (Fig. 3 A.). These are as a rule 

 placed immediately upon the membrane cells but once I have found 

 a few of the glands placed upon a small roundish cell while the 

 other glands occurring on the same membrane cell were placed 

 immediately upon its wall. In a not yet published paper about the 



Mediterranean Ghrysymenias, the 

 plates of which Professor K u c k u c k 

 has most kindly allowed me to see, 

 he has figured a quite similar oc- 











currence, but not having seen the 





ioOq 



Or 



O 





'o^^^ss:^^ 



Fig. 



Chrysymenia ventricosa 

 (Lamour.) J. Ag. 

 Tetrasporangia in the bark-layer (250: 1). 



text I do not know how far this 

 is a seldom or more common ap- 

 pearance in the Mediterranean 

 specimens of Ch. ventricosa. The 

 glands seem always to be solitary 

 but several occur on each cell. 

 The gland-cells are oblong-roundish 

 when seen from the side (Fig. 

 3 B). Further in the older part of 

 the thallus we find hyphge-like filaments growing out from the 

 innerside of the membrane-cells (Fig. 3 C). They are irregularly 

 bent in the lowermost part and often sw^ollen, in their upper part 

 nearly cylindrical consisting of cells about 16^ thick and 6—12 

 times as long. I have only found unbranched filaments. 



The tetrasporangia are produced in the bark-layer and occur 

 over the whole thallus; they are about 20/^ broad and cruciately 

 divided (Fig. 4). 



The cystocarps are likewise scattered over the thallus-surface 

 they are hemispherical-prominent and have an apical porus. 



This species hitherto known, so far as I know, only from the 

 Mediterranean and from the shores of Morrocco in the Atlantic, I 

 have found abundantly in the sea to the north of St. Jan and 

 especially in the Sound between St. Thomas and St. Jan. 



It occurred in rather deep water, 12 — 15 fathoms, and was found 

 both with tetraspores and cystocarps in the month of March. 



