157 
coast, in 1906, 1907 and 1908, and did not pap the plant. Parts 
of ampshire and Sussex have been examin y the writer, but 
though the plant was not seen, its absence untae be certified, as the 
tides on one oecasion and the season of the year on the other were 
somewhat unfavourable. It will be ess to follow the 
progress of Colpomenia in the English Channel, and to note how 
far it will advance in any easterly direction, and whether it will 
ipeaee on the northern coast of Cornwall and Devon. Sauvageau 
records a single specimen found attached to wreckage ~ Wimereux 
(near Boulogne), but, with this exception, the alga not known 
further east than Poole Harbour in England and the Cherhditre 
neighbourhood in Franc 
“When Colpomenia was s first recorded in the English Channel 
doubt was expressed as to whether it would be able to survive the 
cold of winter. Up to the present time an ordinary English winter 
has in no way igre the plant ; and it is remarkable that the alga 
reaches its maximum development during the season that the sea is 
coldest ; there is thus every probability that it has become an 
essential constituent of our south-coast flora. The species occurs 
in many of the warmer parts of the world, and it would be of 
interest to learn something of its seasonal development i in the tropics, 
and in Australia, or other parts of the southern hemisphere. As 
far as has been observed the vigour of Colpomenia on the British 
coasts shows no sign of abatement, the growth during the spring 
of 1910 being as abundant and luxuriant as on any previous 
occasion, Sauvageau mentions a case at Vannes in which its 
growth was completely suppressed by a species of Enteromorpha. 
Some oyster-beds, which he states were deplorably invade 
Colpomenia in 1906, were attacked by the Enteromorpha (probably 
a variety of EF. clathrata J. Ag.),in 1907. The latter developed in 
such profusion that it choked the Colpomenia, and in the spring of 
found. 
lescribed. Althou h Weymouth has bee Teed times 
since that date so good an illustration of “ ballon Bait as not 
again been seen 
