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 treasiires 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 aiid 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 algas. Alarla esculenta, several feet in length, 

 is beaten to a fringe against the rocks, and Agamm Turneri, the 

 sea-colander, is also found here, together with beautiful speci- 

 mens of Rkodymenia 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) JEolis and Dendronotus. Cling- 

 ing sideways to the rocks jtist 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. Littorina palliata is abundant on the rockweeds (Fncus) ; 

 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, Acmcm testudinalis, Buccinum undatum, Mya, 

 arenaria t and Mytillus edulis. 



