109 



the parenchymatous tissue (comp. Figs. 116 and 117); this consists 

 of 24 layers of cells of which the innermost are the largest; 

 the cells are nearly colourless and rather loosely connected. 

 From the periferal smaller cells in this tissue the short assimi- 

 lating filaments arise. These are composed of the smaller sup- 

 porting, more or less clavate cells with proportionally broad 

 summit and the large assimilating cells. The shape of the last 

 mentioned is rather variable, sometimes longer, oblong-oval to sub- 

 cylindric (long. = 57 /*, lat. 27 //) sometimes shorter, broad oval 

 (long. = 45 fjL, lat. = 30 n] and they are mostly, as mentioned 

 above, provided with a short apiculus. The chromatophore (Fig. 

 116) is well developed; it is parietal, placed in the upper end of 

 the cells, bell-shaped, with long thin prolongations downwards 

 along the walls of the cells. In the middle at the top of the cell 

 it contains a pyrenoid. Also the supporting cells contain a chro- 

 matophore but lesser developed. 



In the space between the supporting cells the chalk incru- 

 station is present as an annular ring giving firmness and cohesion 

 to the thallus. The assimilating cells protude freely over the 

 chalk incrustation. 



The material examined was sterile. 



M lle VICKERS in her "Liste des Algues de la Barbade" re- 

 ports Galaxaura apiculata from Barbados. I have not seen her 

 specimens but feel convinced that she has had similar apiculated 

 specimens before her and which I prefer to refer as explained 

 above to Galaxaura margin at a and not to the Japanese plant, G. 

 apiculata. 



This plant has been found in shallow water in a sheltered 

 locality. 



St. Croix: The Harbour of Christianssted. 



Geogr. Distrib. : West Indies, Atlantic coast of South America. 



Sectio V. Vepreculce Kjellm. 

 11. Galaxaura occidentals nov. spec. 



G. frutescens, densa, stipitata, stipite subtereti, fronde 

 dichotomo-ramosa, inferne subtereti, superne complanata, sic- 

 cata canaliculata, sordide griseo-olivacea, membranacea, super- 

 ficie inferne splenclore carente, in superiori parte ssepe irides- 

 cente. Internodia in basi contracta, 2 3 mm lata. Papilla in 



