whorl of pores or scars, similar to those found in P. Peniculus, 
but smaller. The differences, therefore, between our present 
plant and the older species are now limited to the shape of the 
ramuli, the more distant and less swollen nodes of the stem, and 
the more membranous substance. 
As far as I know, this species was only once dredged by Mr. 
Clifton, in 1857. It would seem therefore to be of very rare 
occurrence. 
I take this opportunity of stating that P. Peniculus has been 
found in profusion by Dr. Mueller at the Heads of Port Philip. 
Previously it had not been known to the eastward of Port 
Lincoln; nor have I myself collected it, except at King George’s 
Sound. 
Fig. 1. Potypuysa Ciirtont,—the natural size. 2. Apex ofa frond. 3. One 
of the ramuli, with ripe spores. 4. Spores removed. 5. Portion of the 
stipes, showing perforations at the nodes :—the latter figures magnijied. 
