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mentary stars, arranged in transversal rows on the segments, and partly confluent.
Length of adult animal 7 mm.
Remarks. As pointed out by v. Beneden, this form was recorded by
Slabber as early as in the year 1778. under the Dutch name "Agaat-Pissebet", and
the specific name ayata applied to this form by v. Beneden should therefore perhaps
be preferred to that proposed by Leach (puUhra)] but the Leachian name
has been so generallyd used, that it would be inappropriate to change it, The
form recorded by the present author as Slabberina ay His, is undoubtedly the same
species, and I also fully agree with Dr. Hans en in regarding the Slabberina yra-
cUis of Bovallius as only founded on a young specimen of the present species.
Occurrence. I have observed this form rather plentifully in the inner
part of the Trondhjem Fjord, at Levanger, where it occurred close to the shore
in quite shallow water, swimming rapidly
about between the stones in a manner
very similar to that -observed in the Dytisci and Gyrini. I have also taken it
near the sandy beach of Listerland. and occasionally in the Christiania Fjord,
at Laurkullen and Fredriksvsern. According to Dr. Bovallius. the specimen de-
scribed by him as Slabberina yracilis, was taken up in the dredge at Drobak from a
depth of 100 fathoms; but it is most probable, as opined by
Dr. Hansen. that it
did not come from this depth, but had entered the dredge during its uphauling.
Distribution. British Isles (Leach). Kattegat (Meinert),
(Moebius), Dutch coast (v. Beneden). coast of France (Bonnier).
Fam. 5. Limnoriidae.
Baltic at Kiel
Characters. Body subdepressed, capable of being rolled into a ball. Ce-
phalon short and very convex. Coxal plates behind the 1st segment of mesosome
well denned, laminar. Metasome composed of G well-defined segments,
the last of
which is very large, clypeiform. Antenna? small, subequal in size. Oral parts on
the whole normal, adapted for biting. Legs of uniform structure, all being am-
bulatory in character. Pleopoda well developed, serving both for swimming and
breathing; 1st pair of same structure as the succeeding ones; 2nd pair in male
with a lateral stylet on the inner plate. Uropoda comparatively small, lateral,
rami not lamelliforni.
Ib'innrk*. This family, first established by 0. Harger.
is not difficult
to distinguish from any of the preceding ones, whereas in certain points it