264 HISTORY OF BRITISH ZOOPHYTES. 
them, in a vase by itself, performed movements which ap- 
peared to me extraordinary in a creature of so soft a con- 
sistence, after I had given it a fresh supply of water. With 
a lens, I perceived that these movements were caused by the 
presence of an animalcule, which the Lwcernaria seemed to 
pursue, turning to the right and to the left, endeavouring to 
catch it. Every time that it removed to the distance of 
about an inch, the Lucernaria ceased to move; if it drew 
nearer, the chase forthwith recommenced, and the move- 
ments were quick and lively. The animalcule was at last 
caught by the tentacula of one of the rays, which imme- 
diately bent back towards the mouth; the other rays con- 
tinued always expanded: this ray resumed, by degrees, its 
ordinary position. Having procured other animalcules, I 
gave them to my Lucernaria, and I had the pleasure of 
seeing the same movements repeated.” 
4, LuceRNARIA CYATHIFORMIS, Sars. 
Hab. Southend, Arran, D. L., jun.; Corrigils, Arran, 
DL. 
So far as I have known, this ZLuwcernaria has not been 
observed anywhere in Britain except in the island of Arran. 
A few years ago it was got in great abundance on rocks in 
the sea at Southend, isle of Arran, and as Mr. Alder was 
