NOTES ON THE FAUNA OF THE ISLE OF MAN. 321 



The rocks on the north-western side of Port Erin, 

 extending outwards towards Bradda Head, form a good 

 collecting ground at low water, and many of the tidal pools 

 are well-stocked, and contain some rare species. A couple of 

 large and well-formed specimens of the rare sponge Isodictya 

 elegans were obtained from the bottom of a deep pool lined 

 with NuUipore. Many of the pools are almost choked up 

 with Corallina officinalis, attached to which may be found 

 Asterina gibhosa, and Amphiura squamata. The specimens 

 of Asterina gibbosa obtained from the pools at Port Erin 

 were all much smaller than those found on the shore at Bay- 

 ny-Carrickey, between Port St. Mary and Castletown. 



Port Erin is a very good locality for Compound Ascidians. 

 Magnificent specimens of Morchellium argus may be obtained 

 from the deeper tidal pools or hanging from ledges of rock 

 near low water mark. Several species of Leptoclinwn were 

 found attached to stones lying in the rock pools, and a 

 species of Diplosoma was not uncommon in similar situa- 

 tions. 



In a very limited area, on the northern side of Fleshwick 

 Bay, there are a number of well-stocked tidal pools. Some 

 of these contain quantities of Corallina officinalis, in which 

 may be found Asterina gibbosa, Caprella linearis, Pephredo 

 hirsuta (?), Amphiura squamata, Modiolaria marmorata, 

 Sycandra compressa, and Chthamalus stellatus. 



Large numbers of a beautiful anemone, with a large 

 brown disk, probably a variety of Actinoloba dianthus, are 

 found in these pools, generally attached in crevices of the 

 rock from which it is almost impossible to extract them. 



Patella vulgata, variety athletica, is also very common 

 attached to the rocks at Fleshwick Bay. The specimens are 

 of fair size and of very irregular form. The shell is white 

 and chalky, and the tactile processes of the mantle edge are 

 pure opaque white, and very long. 



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