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Occurrence. This form is found parasitic in the branchial cavity of spe-
cies of Leander (Palsemon), such as L. scrratus, squilla and Eathfcei, sometimes
on the left, sometimes on the right side, in every case causing a strong lateral tuber-
osity of the carapace, similar to that caused by Bopyroldes liippolytes (fig. 2 x).
It has not yet been recorded from Norway; but as at least 2 of the species of
Lei'ut-ilrr, which at times are infested by this parasite, are very common on
our coasts, it is most likely that, on a closer investigation, it will be found
to belong to the fauna of Norway. The figures of the female here given
are from a specimen found on Leander serratiis from the Danish coast; that of
the male is copied from Sp. Bate and Westwood's work.
Distribution. Danish coast (Meinert), British Isles (Sp. Bate), coast of
France (Giard & Bonnier), Mediterranean.
Gen. 2. BOpyrOideS, Stimpson, 1864.
: Syn Bopyrus,
Kroyer (not Latreille)
Gyge, Sp. Bate (not Corn. & Pane.)
Generic Characters. Body of female resembling that of Bopyrus, though
having the cephalon less broad, the lateral parts of mesosome perfectly smooth,
and the metasome distinctly segmentated. Posterior antennae 4-articulate.
Terminal joint of maxillipecls well defined, but rather narrow. 1st pair of incu-
batory plates concealing the whole ventral face of cephalon, and having the
distal segment broadly securiform; the succeeding pairs, as in Bopyrus, widely
apart. Legs short, more or less concealed within the lateral margins
of the
mesosome. Pleopoda obsolete, being replaced by slight fleshy ridges. Uropoda
wanting. Mtdc with the segments of metasome fused together. Parasitic in
the branchial cavity of species of the genus kpirontocaris (Hippolyte).
BemctrJcs. This genus, established by Stimpson, is nearly
allied to
Bopyrus, from which it is chiefly distinguished by the absence of true pleopoda,
and by the male having all the segments of metasome fused together. The
species of this genus are found parasitic in the branchial cavity of different
Carida belonging to the genus Spirontocaris Sp. Bate (Hippolyte Kroyer). To
the fauna of Norway belongs only a single species, to be described below.