IqG TJie hish Naturalist. October, 
arhuscula or southern C. granulatum were not represented, 
but this may be perhaps due to the more exposed spots 
being less accessible. The presence of Alaria and Asco- 
phyllum together is particularly interesting. As a rule, 
Alaria (except for odd plants in pools) occurs on exposed 
and rather steep shores, whereas Ascophyllum requires 
shelter and prefers sloping rocks or boulders. Presumably 
the peculiar physical nature of the shore at the ends of the 
island provides in a combined form the conditions essential 
for each species, namely, the ruffled well-aerated water 
required by Alaria and the protection from breakers neces- 
sary for Ascophyllum. 
Amongst interesting species, attention may be drawn to 
Prasiola crispa, Chantransia Chylocladiae, and Pterosi- 
phonia parasitica, notes on which will be found in the list. 
As to absentees, although a special look-out was kept for 
C odium mucronatum var. atlanticum, Callithamnion granu- 
latum, C. arhuscula, and Ptilota plumosa, none of these 
species were found. The last two boreal plants are supposed 
to occur in the south of Ireland ; I have, however, seen no 
specimens, and it is highly desirable to have the records 
confirmed. Halopithys pinastroides, which is only known 
in Ireland from Leinster, was also not collected. 
In addition to dried specimens, a packet of fresh weeds 
which had been soaked in lo per cent, formahn was for- 
warded. These remained in excellent condition for several 
days, and illustrated the value of this method of sending 
fresh material through the post. 
The following is a complete list of species collected : — 
List of Species. 
Cyanophyceae. 
Hyella caespitosa Born. In Spirorbis in Phyllophora rnbens. 
Chlorophyceae. 
Prasiola crispa Mcnegh. — " Common 50 feet, nor higher, I think, than 
on the rocks at the S.W. end 150 feet." [R. LI. P.], Re- 
amongst the bird colonies. I markabiy fine specimens, and 
did not see it lower tlian about much larger than anything 
