422 Dispersal of Marine Animals by Seaweeds. 
marina), to the leaf-like fronds of which these anemones 
delight to adhere with their broad disks. Indeed in this 
district this actinian seems to prefer this weed to any other, 
a fact I have not seen recorded in any of the scientific publi- 
cations to which [ have had access. During the fall of every 
year the biade-like portions of this weed become detached 
and are soon carried by the currents into the tideways. A 
single extract from my note-book will be sufficient to confirm 
this fact. On the 7th of September, while standing on the 
extremity of the eastern breakwater, I noticed large quantities 
of Zostera marina being swept to sea by the ebbing tide, 
and in one instance three specimens of Anthea cereus were 
observed adhering to the same weed with their tentacles fully 
expanded. 
Geographical Distribution of the above-mentioned Species. 
According to Messrs. Forbes and Hanley (3) ‘ Cardium 
edule has a wide range, extending southward to the Canary 
Isles.” Mytilus edulis, according to the same authorities, 
“ranges all round the coasts of the North Atlantic, on both 
its eastern and western sides, and into the Mediterranean.” 
Acanthodoris pilosa and Polycera quadrilineata are both 
generally distributed around the British coasts; while Aplysia 
is found along the shores of the Mediterranean and also at 
Madeira. 
The polychaete annelid Spzrorbis borealis, in addition to 
being generally distributed along the shores of Great Britain 
and Ireland, is also found on the coasts of Norway, France, 
and Denmark. 
Idotea tricuspidata has been captured on the Cornish and 
Devonshire coasts, and also along the south-western shore of 
ireland and the western coast of Scotland. This species is 
abundant in the Mediterranean. 
Turning now to Hydroids and Polyzoa. According to 
Mr. T. Hincks (4), Clava multicornis is “ generally distributed 
on our coasts.” Sertularia pumila is also “ generally dis- 
tributed.” 
Aglaophenia pluma, according to that author (4), ‘is much 
more at home in the south and west than in the north.... 
Throughout the north it seems to be sparingly distributed, 
whilst along the south-western coasts it is extremely abundant 
and ot great size and beauty.” This species has been re- 
corded on the Belgian coast, and is not uncommon in the 
Bay of Naples. 
Bicellaria ciliata, Membranipora pilosa, and Flusira foli- 
acea are all generally distributed round our British coasts (5), 
the two former being also found on the east coast of France, 
