42 INTRODUCTION 
It was hard to resist robbing this rock pool, where the author 
in half an hour counted twenty different species, and finally left, 
feeling that its treasures were not half discovered; but collecting 
should be done elsewhere, and this pool be guarded as a gem to 
be admired and not to be despoiled. 
This pool in Anemone Cave, although so very attractive, is 
surpassed in beauty and interest by pools on Porcupine Island, 
at the base of the cliff. This place is somewhat difficult of access, 
and the timid will not undertake the descent to it; but the en- 
thusiastic collector, who overlooks small obstacles, will be repaid 
by a visit to this spot, where all the treasures of Anemone Cave 
are multiplied many times over. These pools are resplendent with 
large anemones, hydroids, nudibranchs, mollusks, echinoderms, 
crustaceans, and alge. Alaria esculenta, several feet in length, 
is beaten to a fringe against the rocks, and Agarwm Turneri, the 
sea-colander, is also found here, together with beautiful speci- 
mens of Rhodymenia palmata, which is so plentiful that it reddens 
the rocks. 
A Metridium marginatum, the most common sea-anemone of 
this coast, was taken here which measured six inches in diameter. 
This creature threw out so many of the processes used for de- 
fense that it seemed at first as though it were covered with some 
seaweed; but the worm-like movements of these threads, which 
measured six inches or more in length, soon disclosed their nature. 
On the more accessible shores of Porcupine Island are found 
the naked mollusks (nudibranchs) olis and Dendronotus. Cling- 
ing sideways to the rocks just above high-water mark are many 
shells of Littorina rudis. They are fastened to the rocks by a 
glutinous deposit along the outer lip, and the peculiar exposure. 
of the open end, as well as the position above tide-mark, indi- _ 
cates that this animal is undergoing transformation into a land 
species. Lattorina palliata is abundant on the rockweeds (Fucus) ; 
some of the specimens are banded with yellow, and all closely 
simulate the seaweed on which they cling. Beautifully banded 
specimens of Littorina litorea are also plentiful. Among other 
shells which are abundant here as well as elsewhere on this coast 
are Purpura lapillus, Acmea testudinalis, Buccinum undatum, Mya 
arenaria, and Mytillus edulis. 
