has been prepared. It is only necessary to glance at that 
figure, and compare it with the other species of Grifithsia 
figured in previous plates of this work, to see the strong cha- 
racters by which the present is known from all the others. 
Here the few last articulations of all the branches are furnished 
with slender, byssoid fibres, and on these fibres the tetraspores 
are borne. In tenuity of frond there is a resemblance to G. De- 
voniensis, and in the pyriform articulations to G. corallina, but 
the byssoid ramuli are peculiarly its own. 
G. barbata was discovered by Mr. Borrer, many years ago, 
cast ashore on the beach at Brighton, and for a long time our 
knowledge of the species rested solely on the few specimens so 
picked up. It is only recently that the plant has been found 
growing on the shores of the Channel Islands and of the north 
of France—the only localities hitherto recorded. One would 
hope that a more accurate exploration of the southern coasts 
of England and Ireland would, in a favourable season, reward 
the algologist with a new locality for so rare and so beautiful a 
plant. 
Fig. 1. GrirFirHsia BARBATA :—the natural size. 2. Part of a frond, bearing 
tetraspores. 3. Apex of a branch of the same. 4. A tetraspore, attached 
to a fibre. 5. Part of frond with favella. 6. The favella removed. 
7. Spores from the same :—maguified. 
