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On a closer examination, will turn out to constitute types of distinct, though
nearly allied genera. This may especially be the case with the 2 species from the
Challenger Expedition, N. lateralis and globularis,
both of which were found on
Euphausiidse. The species described from the Norwegian North Atlantic Expedi-
tion as N. clypeata, seems to agree more closely with the type species, though this
form, too, exhibits some rather pronounced peculiarities. The Norwegian species,
described below, is the first one recorded, and must accordingly be regarded as
the type of the genus,
Notophryxus ovoides, G. 0. Sars.
(PI. XCV).
Notopliryxus ovoides, G. 0. Sars. Oversigt af Norges Crustaceer I,
p. 71, PL II, fig*. 911.
Specific Characters. Body of fully grown female ovoid in outline, some-
what widening behind, with the cephalic part projecting in front as a broadly
rounded prominence, scarcely at all deflexed. Dorsal face of mesosome
slightly convex, with the segments only visible along the middle, lateral parts
strongly tumefied, and projecting posteriorly beyond the tip
of the metasome.
Ventral face canaliculate along the middle, and forming in front a comparatively
small rounded oral area, abruptly contracted behind. Metasome constituting a
short, semicircular deflexed plate, with only slight traces of segmentation.
Marsupial cavities nearly contiguous along the middle of the ventral face, their
posterior openings pushed on to the dorsal side. Antenna? imperfectly defined,
lamelliform, constituting together a broad horizontal plate defining
the oral area
in front, and deeply incised in the middle, to receive the oral cone. Body of
young female narrower, oblong oval in form, with the metasome more distinctly
segmented and projecting behind, being strongly
curved downwards. Adult male
narrow linear, resembling in shape that of Dajus mysidis; metasome, as in the
latter, undivided. Colour of female pale yellow, with short reddish orange trans-
versal bands across the median part of the back. Length of fully grown female
3Y2 mm.,
of male 1 mm.
Remarks. This form was described by the present author in the year
1882, but was at that time not subjected to a more detailed analysis, for which
reason several peculiarities had escaped my attention. The description and figures
now given are based upon a very close examination of several specimens, one
of which was carefully dissected, in order to assertain some difficult points, especi-