of a fucus, was found within, and proved to be hollow. On the
branches were several avicul/e, covered with long spines; and with
one of the ears extremely long: the species not being described by
Lamarck, and not recollecting to have seen it, I have made a
drawing of that, and a part of the sertularia, fig. 5. Arwmiee were
attached to these shells, and also to the sertularia; and on a broken
valve was a fragment of the siliquaria echinata. The whole was of
an elegant, arborescent form, and extremely interesting, from the
combination of objects which it presented.
•SJicwT&ch.' de&efr&Hkoa.
