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joints, which is the strangest of those mentioned, is not to be
altogether counted on ; for though I have not observed the joints
in any specimen of C. rupestris to be of the extreme length of
those of C. nuda, yet I have seen a tendency in some specimens
of that species to produce long joints; and this, joined to the
non-occurrence in recent times of C. nuda, has latterly disposed
me to consider it a variety of C. rupestris. As, however, it has
already obtained publicity both in this country and on the Continent,
I think it deserving of being figured in this work, and
shall be happy to find that future researches prove its title to receive
a name. Last summer (1850) I sought for it diligently on
the basaltic rocks in the neighbourhood of the Giant’s Causeway,
but in vain; and it was out of my power to extend the exploration
as far as Port Stewart.
Fig. 1. C l.id om io k a NUDA:— the n a tu ra l size.
3. E am u li:— more i
2. Portion of a brancli :-
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