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much more advanced stage, the one from the Norwegian coast, the other taken
from a fisher's boat at Skagen (Denmark), and kindly sent to me for examination
from the Museum of Copenhagen. The habitus-figure given on the accompanying
plate is from the latter specimen, whereas the detail-figures
have been made from
dissections of the other specimen, which was in rather a bad state of preserva-
tion, though it admitted of an exact examination of all the appendages. This spe-
cimen was taken off the south coast of Norway (the exact locality not being
stated), and measured 24 mm. in length. It was accordingly of about the same size
as that described by Dr. Bovallius under the name of Rocinela Lilljeborgii. and
agreed with it in all respects. The Danish specimen was considerably larger,
measuring in length 29 mm., and had the anal segment somewhat broader in
proportion to its length, though otherwise it agreed very closely with the Norwegian
specimen. In both, the 7th pair of legs were well developed, and of exactly the
s;iine structure as the preceding pair, though not quite so long, at least in the
Norwegian specimen. In fully grown individuals this pair are, in all probability,
the longest of all. I can see no essential differences between the European and
American forms, and am still of opinion that they belong to the very same
species. The only difference is that the legs, according to the detail-figures given
by 0. Harger, are somewhat more spiny
in the American form than in the Nor-
wegian form ; but the number of spines in all probability increases with age, and
some of the American specimens are of very considerable size, reaching to no
less than 44 mm. in length. The slight difference in the relative length of the
anterior and posterior divisions of the body, found on comparing the habitus-
figure given by 0. Harger with that of the accompanying plate, may
arise from
the different sex of the 2 specimens, the one here figured being a female, whereas
that figured by 0. Harger is a male. As to the form of the anal segment, it
may also vary to some extent ; it was, indeed, in the Norwegian specimen, more
like that of the American form than it is in the Danish specimen.
Page
70. Cirolana borealis.
Distrihtition. The Barents Sea (Hoek).
Page 81. Idothea pelagica.
Occurrence. Some well-marked specimens of this form were sent to me for
examination by Mr. Schneider, who took them at Vadso. It has also been collected
in the Trondhjem Fjord by Curator Storm, and I found it myself last summer
at Christians and. In all 3 cases it occurred close to the shore among algae.