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214
Miiller ought to be referred to the genus Athdges, exhibiting, as it does,
all the
essential features of that genus. As regards the present species, the shape of
the terminal piece of the metasome agrees rather closely with that in the Brazi-
lian species, and also the form of the lamella? of the pleopoda
seems to be
essentially the same. The apparently anomalous structure of the metasome in
the male may perhaps be due to the fact that the specimen it not yet fully grown.
Occurrence. The above-described specimen was found clinging
to the
metasome of an Eupayurus cutim-ii*/* taken in the Kattegat by Dr. Petersen, and
kindly sent to me for examination. The species is accordingly not yet proved to
belong to the fauna of Norway; but as Eupayurus cuanensis is not infrequently
met with off the south coast of Norway, it is very probable that its parasite
will also be found to exist off our coasts.
Distribution. Kattegat. (Copenhagen Mus.).
Gen. 6. PhryXUS, Rathke, 1843.
Generic Clttiractcrn. -
Syn.: Bopyrus, Kroyer (no.t Latr.)
Hemiarthrus, Giard and Bonnier.
Body of adult female very asymmetrical
and de-
formed, one side (left or right) being greatly swollen and much longer than the
other. Cephalon small and deeply sunk within the mesosome. Segments of
latter densely crowded together and only visible dorsally, coxal plates very small
and only present on the shorter side. Metasome, as in Athdycx, without any
true epimeral plates, and only consisting of 5 segments, the last forming
a nar-
row terminal piece. Antennse very small and difficult to observe. Maxillipeds
without any terminal joint. Incubatory plates very unequally developed, those
on one side alone sufficing to form the large marsupial pouch; 1st pair not pro-
jecting in front, being concealed by the next succeeding one. Legs wholly
pushed on to the dorsal face, and more or less contorted, those of the larger side
all obliterated, with the excepttion of the 1st. Only 4 pairs of pleopoda present, and
these rather unequally developed on the two sides, outer lamella larger, foliaceous, and
extend ed laterally, inner lamella small and pushed on to the ventral face. Body of
young female less asymmetrical, with all the legs present, though rather irregularly
arranged on the one side; that of immature female (immediately after the trans-