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64
7. ^Ega ventrosa,
(PL XXVI, fig. 3.)
M. Sars.
JEya, ventrosa, M. Sars, Chr. Vid. Selsk. Forh. 1848, p. 156.
Syn: jEga Loveni, Bovallius.
JEgioclms ventrosus, Bov.
NordensJcyoldi, Bov.
Specific Characters. Body rather broad, oval in form,
with the dorsal
face slightly vaulted and quite smooth. Cephalon of moderate size, with the front,
as usual, slightly produced in the middle. Coxal plates of usual structure. Meta-
some exceeding half the length of the mesosome, epimera acutely produced; ter-
minal segment subtriangular, produced at the tip to an obtuse point,
dorsal face
plain, outer part of the edges distinctly serrated, and armed with minute spinules.
Eyes rather narrow, separated in the middle by a distinct interspace. Antennae
very slender, resembling those in ^E. arctica, though the flagellum of the superior
ones is somewhat longer. Anterior pairs of legs with the inner edge of the meral
joint sinuated, and only armed with scattered small denticles. Uropoda
with both
plates distinctly serrate and denticulate, the inner one broader than the outer,
and having a very slight emargination outside the tip. .Colour pale yellowish,
sometimes with a tinge of chestnut. Length of adult animal 23 mm.
Remarks. I fully agree with Dr. Hansen in believing the 3 forms re-
corded by Dr. Bovallius as JEga Lore'ni, ^-Egiochus Nordenskjoldi and jEgiqchus
ventrosus, to belong to one and the same species. The genus sEyiochus cannot
be maintained, as, according to Dr. Hansen, it is only founded upon a spurious
character, caused by an imperfect exuviation of some specimens. The differences
pointed out by Dr. Bovallius between the 3 forms, appear, on the whole,
to be
quite insufficient as specific distinctions. The present species, first described by
my late father, agrees with ;E. arctu-a in the structure of the antenna?, but is of
rather inferior size, and, moreover, has the body comparatively broader, the eyes
much narrower, and the terminal segment
ent shape.
of the metasome of rather a differ-
Occurrence. The species would seem to occur not infrequently along the
whole Norwegian coast, from the Christiania Fjord to Komag Fjord
in West Fin-
mark. As far as I know, all the specimens secured have been taken by the aid
of the dredge from rather considerable d