In habit this species resembles several species of /7alymenia, 
to which genus I formerly referred it; but the structure of the 
frond, if my analysis (made from dried specimens) be correct, 
forbids our regarding it as a Halymenia. In habit also there is 
a striking resemblance with Memastoma palmata, shortly to be 
figured in this work, but the structure is even more unlike. No 
fruit has yet been observed, and consequently the genus cannot 
be absolutely determined. But as the structure of the frond 
agrees tolerably well with that of G@lovosaccion, 1 am induced, 
notwithstanding some difference in habit, to place this plant 
provisionally in Gloiosaccion. 'The difference in habit is not so 
great as appears; for though G7. Brownn (Tab. LXXXIIL) is 
most usually quite simple and baglike, yet it sometimes occurs 
with once or twice forked fronds, showing that an unbranched 
habit is not essential, even as a specific character. 
Fig. 1. Guorosaccion pieiraTuM,—the natural size. 2. Section through a 
portion of the wall of the tubular frond. 3. Vertical view of the peripheric 
cells :—magnified. 
