P. H. Gosse described this beautiful little species in his British Sea Anemones and Corals, in 1860, from two specimens obtained from a pool at Petit Tor, near Torquay.
I recently collected two specimens at Zennor, some five miles along the coast south of St. Ives, Cornwall.
An examination of these proved that Gosse's examples were young and immature, as shown by the difference of size and number of tentacles.
Their habitat was very similar to that of the Torquay specimens,
namely, attached to the under side of granite stones, at the bottom of a shallow pool in a small dark cave, just at the top of the Laminarian zone. There occurred also on the same stones young specimens of Actinia equina (Linn.), Cereus pedunculatus (S. Bellis), and a number of Depastrum cyathiforme.
Ref: Journal of the Marine Biological Association of the United Kingdom (New Series). Volume 8, Issue 01, September 1907, pp. 47-48.