INTRODUCTION 
THE present Memoir embodies the results of a systematic 
survey of the algal flora of the south-east corner of the 
Isle of Man. The survey has covered a period of some few 
years and a considerable stretch of coastline has been laid 
under contribution, from Fleshwick Bay in the west to 
Castletown on the south-east seaboard. Much of this 
coastline is too steep to admit of easy access, but wherever 
possible, the algal flora has been sampled and comparative 
studies made between point and point. | 
The area offers considerable variety of algal habitat. 
Fleshwick Bay (Map II, 1) presents a stony beach flanked 
by steep cliffs with boulder-fringed base. As a contrast 
Port Erin Bay (Map II, 4) provides a sandy stretch with 
emergent rocks, giving origin to a series of rock pools with 
a rich algal flora. The broken breakwater at the mouth 
of the Bay also provides the algologist with a profitable 
hunting ground ; for here, seaward of the tumbled concrete 
blocks, may be found those genera and species that flourish 
best in rough water conditions ; while within the shelter 
of the old boat-landing close by, is a quiet arm of the Bay 
in which many of the rarer species are to be found, the 
vertical sides of the concrete blocks offering a specially 
good collecting ground. 
The steep coast lying between Port Erin Bay and the 
Sound (Map II, 7) is largely inaccessible to exploration 
from the land except at one or two points such as Bay Fine 
(Map II, 5) or Aldrick Bay (Map II, 6) where a typical 
boulder beach with its associated floramay befound. This 
type of habitat forms an almost continuous strip of varying 
width round the foot of the cliffs as far as Perwick Bay 
in the south-east. Here and there the bold thrust of a 
