and failed to detect any character which may not be found more 
or less strongly marked in some specimens of P. e/ongata, so 
that these two forms are easily traced imto one. Of the three 
species quoted from Kiitzing, I have only seen one authentically 
named ; the other two were communicated by M. Zanardini, on 
whose authority my specimens rest. Judging by the specimens 
I have examined, as well as by the descriptions given by Kiitzing, 
I have no hesitation in referrmg them to P. elongata; and 
probably several other species described by Kiitzing in the same 
section might also be added without impropriety. 
Dr. Greville’s P. rosea has much more the aspect of a distinct 
species than any of those already alluded to. It seems confined 
to deep water, and is much more flaccid than ordinary P. e/on- 
gata, almost gelatinous, closely adhermg to paper in every part, 
and of a brilliant rosy crimson colour. It was first found by 
Sir John Richardson among rejectamenta in the Frith of Forth, 
and has been more recently dredged near Carrickfergus by the 
late Mr. M‘Calla, from whom I have excellent specimens. 
I should mention another plant recently found m Cork Har- 
bour by Lady Louisa Tenison, which seems almost intermediate 
between P. elongata and P. elongella, but different from both. 
At present I hold it over for future determination. P. Grevillii, 
Harv., appears, from a recent analysis, to be nothmg more than 
P. violacea, of a brighter red colour than usual. 
Fig. 1. PoLystPHONIA ELONGATA, a plant of the second year :—the natural 
size. 1. Ramulus with ceramidia. 3. Portion of one of the smaller 
branches. 4. Transverse section of the same. 5. Ramuli with ¢etra- 
spores :—all magnified. 
