533 
In tho case of a coast like that of Norfolk, whore but few, if any 
rocks are accessible, even at tho time of the lowest tides, and most 
of the Alg;e found are water-borne, and often show by their 
condition that they come from a considerable distance, it is useless 
to attempt to indicate the distribution of the Algai recorded. It is 
true that sometimes for a feiv days of very fine weather certain 
species of Algm will bo found to come ashore at definite .spots dav 
after day, showing their place of growth to be on submarine reefs in 
the vicinity; but one rough tide will alter all this, and not a single 
fresh specimen will occur even for weeks afterwards on the same 
beach. 
I have felt some surprise at omissions in this list, which as the 
species omitted are too conspicuous to have been overlooked by such 
careful observers as tho algologists who watched tho Yarmouth 
beach towards the close of tho last, and in tho earlier part of tliis 
century, must bo hold to bo really absent; the.se are Laminaria 
(hgitata and L. bulbosa, and tho whole of tlio spinous section of tho 
genus Geramium-, viz., G. echionotum, G. acanthonotum and 
G. cihatmi. Of no one of these have I myself ever seen e’ven a 
fragment on our coast ; and I can only attribute their absence to a 
want of sufficiently deep water, with a rocky bottom, towards the 
north, within tho reach of tho carrying power of tho tide 
I have rejected from tho present list Sargas.um vulgare, which as 
Harvey says (Man. Ed. vol. ii. p. 1 5), “ has no claim on our Flora • ” 
and I have doubts as to tho justice of retaining some other species 
which appear to have only been recorded as occurring once and 
therefore may be only “casuals;” such as Facm canaliculatus 
Gystoseira granulata, and Gonferva collaben,. A few more species 
appear to mo to bo doubtful or uncertain; such as Gystoseira 
barbata, Ectocarpus braehiatus, and Gladophora diffusa. If tlie 
publication of this list should, by arousing attention, cause some of 
these casuals to be rediscovered, or some of the doubtful species to 
be accurately determined, my object in compiling it Avill have been 
fully answered. 
Tho nomenclature and armngement followed are, so far as I 
can make them by comparison of synonyms, those of Harvey’s 
‘ Phycologia Britannica,’ which must, until tho publication of some 
more recent and comprehensive work, be considered the standard 
of British Marino Algology. 
