314 
With regard to the distribution of the larger algae, the factors 
of first importance would seem to be—(1) the temperature of the 
water ; (2) the salinity of the water ; and (3) the physical nature of 
the coast. When dealing with an area such as Clare Island, the 
conditions dependent upon these three factors are fairly uniform, 
and then the distribution of the aloae and algal associations appear 
to be principally affected by conditions of illumination, desiccation, 
and exposure to waves and rough water. The respective influence 
sublittoral algae and species which are rarely uncovered by the 
tide can occur in pools nearly up to high-water mark, whilst. the 
effect of breakers and rough water will be detected on passing from 
a fully exposed to a sheltered part of the shore. The influence of 
the first two factors is, no doubt, intimately connected, as sublittoral 
presence of deep water algae in dark and partly dry caves would 
suggest that light, and not air-exposure, is often the determining 
factor, 
The collections made on Clare Island contain numerous micro- 
scopic species. Several of these are new to Ireland, and quite as 
many supplied the first specimens from the British Isles for the 
s arium. A few species obtained were entirely unrepresented 
at Kew, 
Turning now to the work on the mainland, one day at Mallaranny 
was all that could be spared for studying the sand-bay flora of 
of such a shore. Clew Bay is very suitable for dredging, and it 
may be confidently expected amply to repay careful investigation 
of the benthos, 
A trip to Bellacragher Bay, an arm of Blacksod Bay, for the 
purpose of examining the brackish flora, was of special interest. At 
the particular portion of the bay visited, a Brown and Green 
eaweed vegetation was much in evidence, whilst the Red Algae 
(Florideae) were almost entirely absent. A most attractive piece 
: work in such localities is to trace the gradual appearance of the 
i 
h 
ie hg largely developed in many of the Scotch lochs, and 
Aten worthy of a more detailed investigation than it has hitherto 
m 
In striking contrast to B 
Florideae in parts of Achill § 
wa : : ’ 
ed at low tide, and the channels of rapidly-flowing 
on », Possessed in places a most luxuriant vegeta- 
fine Specimens were collected here for the 
