150 
Two specimens of this widely distributed species, the occurrence of which on 
the shores of Europe extends from the Mediterranean to Scotland and Helgoland, 
were found washed ashore at Lokken. As they were quite fresh and were attached 
to a fragment of an acorn shell, they must undoubtedly have grown near the place 
where they were found. They attained a length of 6,5 cm. and contained ripe and 
unripe cystocarps. Small antheridial groups were also found on the surface of 
the frond. As to the structure of the frond and the structure and development of 
the fruit I have no new observations; reference may be made to the above quoted 
papers, in particular those of BornET and THURET, and Scumitz. The species is 
easily recognizable by its soft, cylindrical, dichotomous frond having a thin solid 
axis and by the characteristic, immersed cystocarps provided with a dense fruit-wall. 
Locality. Sk: Washed ashore at Lekken, August. 
CORRIGENDA. 
P.9, 1.9 from top, for “Antithammion” read “Antithamnion”, for “Litho- 
thamion” read “Lithothamnion”. 
P. 56, 1. 8 from top, for “cushon” read “cushion”. 
P. 80, 1.5 from top, should read “Fam. 2”. 
P. 88, 1.14 from top, for “egrediunt” read “egrediuntur”. 
P. 91, 1.11 from top, for “egrediunt” read “egrediuntur”. 
P. 97, 1. 6 from bottom, for “egrediunt” read “egrediuntur”. 
