290 MISS SARAH M. BAKER ON THE 
from 1-3 em. in length, simple or bifid ; of very rare occurrence. Plants 
diecious, oogonia and antheridia apparently immature, paraphyses not 
projecting from the ostiole of the conceptacle. 
Hab. Оп mud or sand, along the banks of creeks or among the phanero- 
gams of salt marshes. English coast and №. Spain. 
FUCUS voLUBILIS, var. FLEXUOSUS, ©. M. Baker, var. nov. [ Fig. 7.] 
Plant not fixed by a dise, about 15-20 em. in length ; vesicles numerous. 
Frond much spirally twisted, from 10-16 mm. broad, with prominent midrib 
and much crinkled margin ; producing numerous adventitious buds from the 
base. Receptacles unknown. 
Hab. Among the phanerogams of salt marshes, Mersea Island, Essex. 
SUMMARY. 
An entirely free-growing variety of Pelvetia canaliculata has been de- 
scribed, whose presence has been shown to be beneficial to Salicornia europea, 
probably acting as a surface mulch ; as well as an embedded variety of less 
common occurrence. The receptacles of the spiral Fucus, found as early as 
1778 by Hudson, have been described, and from their nature the deduction 
drawn that this Fucus is not derived from the same species as the almost 
identical F. lutarius of Sauvageau. A variety of this Fucus, of slightly 
different habit, has also been described. The zoning, observed at Blakeney, 
between the free-growing Pelvetia and the embedded Fucus is a point of 
interest. 
In conclusion, I have to thank Prof. F. W. Oliver for placing in my hands 
information and notes on the Blakeney and Southampton Fucoids. I should 
like to offer my sincere thanks to Prof. Sauvageau for the many valuable 
specimens with which he supplied me, and to Mr. A. Gepp for giving me the 
opportunity of examining the herbarium specimens of Hudson and Turner in 
the British Museum, and much information about the algæ in question ; also 
my father and brother for the time and trouble they took in obtaining some 
of the photographs reproduced. 
Text-figures 3 & 4 are from drawings by Miss М. Green, the others by the 
author. 
