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113
their respective males, a fully grown female with a likewise fully grown male, and
a quite young female, with the male still in the Cryptoniscian stage. Both these
specimens, of which figures are given on the accompanying plate, occurred on
the same species of Eupagurus, viz. E. chiroacanthus, hut came from very different
localities, the one having been taken off the south coast of Norway, the other
at Sels0vik lying just within the polar circle. Another adult female was found
likewise on an E. chiroacanthus taken in the Kattegat by Dr. Petersen, and kindly
sent to me for examination. The mode in which the parasite is attached to its
host, is exactly as in A. pcu/uri (see the middle figure at the top of the plate).
Distribution. Kattegat (Copenhagen Mus.).
3. Athelges bilobus, G. 0. Sars, n. sp.
(PL LXXXIX, fig. 3).
Specific Characters. Body of immature female narrow oblong
or fusi-
form in outline, nearly symmetrical, only very slightly curved to the right;
dorsal face convex, ventral concave. Cephalon freely projecting anteriorly, with
the frontal margin evenly curved. Segments of mesosome each produced laterally
to well-defined, obtuse projections carrying the legs below. Metasome not
abruptly contracted, but tapering gradually behind, each of the 4 anterior segments
produced laterally to a long conical projection, apparently constituting
the outer
lamella of the pleopoda, the inner lamella being very small and knob-like ; terminal
piece with 2 rather conspicuous, juxtaposed tubercles dorsally, tip deeply incised
in the middle, or forming 2 lamellar lobes. Male oblong, with the metasome
attenuated and rather large, being fully half as long as the preceding part of
the body, and showing traces of segmentation, as also rudiments of pleopoda, tip
slightly bilobed. Colour not yet determined. Length of the female examined 3.80
mm., of male 1.40 mm.
Remarks. The present new species, it is true, is only based upon a
single evidently immature female specimen together with its male, which perhaps
is also not fully developed; but there cannot be any doubt that it is quite di-
stinct from either of the 2 preceding species and also from those described by
Mr. Hesse. The only form to which it seems to exhibit a closer resemblance,
is the Brasilian^Bopyrid recorded by Fritz Mtiller as Bupi/ms rrsni>huitus. The
latter, however, is kept apart from the genus Athi'hjc* by
M.M. Giard and
Bonnier and regarded as the type of a seperate genus, to which they transfer
the Rathkian name Phryxus. In my opinion, however, the species of Fritz