made the type of a new genus, as proposed by Kiitzing, bis specific
name, Griffithsianum, may very deservedly be adopted. At
present I prefer leaving it in Jsperqcoccus, from its very close
affinity botb witb A. echinatus and A. Turneri.
It appears to be of not unfrequent occurrence in the Mediterranean,
several stations being recorded. I possess a fine specimen
from Catania, given me by M. Gussone; and I have gathered
very large specimens at the Cape of Good Hope, much larger
than any others that I have seen. It is very rare along the
Atlantic coasts of France and Spain, as I am informed by M.
Lenormand, who has kindly sent me a specimen gathered at
Cherbourg; and may probably occur in North Africa, but I have
not received any specimens from that coast. In the British Seas
it has as yet, only been found along the soutbern shores of Lng-
land, and in the Channel Islands; but it is not improbable that
it may yet be discovered on tbe Irish coast, where so many
southern forms reach their northern limit.
Fig. 1. Aspeeoooocus COMPRESSUS ;— the naturalize. 2. A transverse section
of tlie frond. 3. Portion of the same: more highly magnified 4. Portion
of the membrane, viewed vertically. B. Vertical section of a sons-.— more
or It
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