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On thè exposed coast of thè rocky north - west side of St. Croix 
I have collected a crust • shaped alga which seems quite to agree 
with thè Aglao^onia canariensis newly described by Sauvageau. As 
his preliminary, short note on this alga is without any figures and 
a certain Identification therefore was difpcult, I have sent a drawing 
to Professor Sauvageau and asked him if my supposition was right. 
Professor Sauvageau quite agreed with me and has also most kindly 
sent me some material of his plant, by means of which I have 
been able to convince myself of their identity. 
As already mentioned, my plant was found on exposed coast 
and it was here growing in large extensions covering thè rocks 
with a dark - brown crust. lt is of a coriaceous consistency. The 
edges of thè thallus are roundish lobated and these lobes grow more 
or less over each other in a similar way as in Ralfsia. It adheres 
firmly to thè substratum by means of numerous multicellular rhi- 
zoids (fig. 3 a) ending in a disc with irregularly divided, often co- 
ralliform prolongations. The cells in thè stalk of thè rhizoids are 
often swollen in thè middle, this assuming herewith a moniliform 
appearance, but quite cylindric cells also occur. 
Fig. 3 . Aglaozonia canariensis Sauv. a transverse section of thallus with 
rhizoids, b edge of thè thallus seen from above, c trans verse section of thè edge 
of thè thallus, d transverse section of thallus with young hairs (about 70 : 1). 
