THE PARASITIC ANEMONE. 
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on some univalve shell, which is tenanted by a Soldier-crab; 
young specimens on Turritella terehra, Trochus magus, T. 
zizipliinus, &c. ; but adults, which are much more frequently 
met with than the young, almost invariably on the great 
Whelk {Buccinum undatum). The dredge, indeed, often 
brings up shells invested by this Anemone, which are 
empty ; but I believe that in every such case the shell 
has recently been vacated by the Soldier, and that the 
Sagartia never voluntarily selects either an empty shell, 
or one tenanted by the living Mollusk, for his residence. 
My friend. Dr. E. Percival Wright of Dublin, has 
favoured me with a humorous sketch of the ways of this 
loving pair, — Crab and Zoophyte, Arcades ambo, — which 
bears on the matter before us. “ The following scene,” 
he observes, “ was witnessed by my much lamented friend 
Dr. R. Ball. One of the specimens referred to, attached 
to the shell of a Buccinum undatum, which had from its 
appearance been, in all probability, just deserted by a 
Pagurus, was placed in a glass aquarium : in a short time 
the Anemone left the Buccinum, and attached itself to the 
side of the tank ; it next deserted this position and fixed 
itself on the side of a large stone that filled the centime 
part of the aquarium. After the lapse of some weeks, a 
Hermit Crab was dropped into the tank (I think Pag. 
hernhardus). Well, if these Hermits can’t live without 
hiding themselves in the deserted shell of some poor Mol- 
lusk, I think it is equally true that they can’t live happy 
until they hide both themselves and their shells in some 
quiet little hole in the rock -work of our aquaria, from 
whence they can look out; and, thinking that the super- 
imposed stone-work adds vastly to the strength of their 
fortifications, experience sundry intense feelings of safety. 
Be this as it may, the Hermit in question was not long ere 
he walked up to a little grotto that was in the rock-work 
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