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ences are present however. Thus, in Mrs. Gepp’s drawing we find 
on thè upperside 3 layers of small cells while in my plant most often 
only a single layer is present. And, furthermore, thè large medullary 
cells in thè middle of thè thallus are not so high as in our plant. 
But in older thallus in thè West Indian form I have found thè large 
cells divided by secondary walls being not much higher than in 
Mrs. Gepp’s drawing and thè cells below thè epidermis on thè upper- 
side are also here divided into rather small cells. Professor Sauvageau 
with whom I have been discussing this problem also directed my 
attention to thè fact, that while these secondary walls in our plant 
lie at different heights (fig. 3 d), all thè cross walls in Mrs. Gepp’s 
drawing nearly correspond with each other. But whether we really 
have here some characters making Harvey’s and Mrs. Gepp’s plant 
specifically different or not from ours, I think can only be settled 
by means of an examination of thè originai specimen of Harvey. 
Should then thè plant from thè Atlantic Ocean turn out to be iden- 
tical with that from thè Indies ours plant ought to be called Aglao- 
\onia ceylanica (Harv. Gepp) which in my opinion Harvey’s plant 
must be called in any case. 
1 may point out further, that Heydrich (1. c.) mentions a Zonaria 
parvula Grev. var. duplex n. var. which seems to belong to our plant. 
In thè Danish West Indies Aglao^onia canariensis was found 
on very exposed coast incrusting thè rocks at about high water mark 
and somewhat below. lt was gathered in February and was then sterile. 
St. Croix : at « Northside » estate. 
1909) Mr. and Mrs. Gepp consider Ralf sia ceylanica , Harv. as « nothing but a 
typical form of Zonaria variegata». Judging from Msr.’ Gepp’s figure I cannot 
agree with them in this view. 
