sentences:  It is relatively common in the Mediterranean, and is found along the European coast as far as the British Isles, although it has not been recorded off the coast of West Africa.Around Great Britain, there have been a few observations from the English Channel and North Wales, but the only place where significant numbers are known to occur is on a site east of Saint Tudwal's Islands in Tremadog Bay.Its occurrence there may be related to warm currents coming from the Bay of Biscay and the sheltered nature of the area.