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being conspicuously constricted at the base of the caudal fan, all segments very
sharply defined, and having distinct rounded epimera. Superior antennae in female
much shorter than the cephalon, first joint of the peduncle about the length of
the other 2 combined, flagellum not exceeding in length the last peduncular joint,
conic in form, and exhibiting 1 or 2 extremely small terminal joints; those in
male more than twice as large, and, as a rule, refiexed, last joint of the peduncle
very movably articulated to the 2nd, and gradually widening dislally, fiagellmn
fully as long as the peduncle, and rather thick at the base, being composed of
about 10 articulations, each provided with a dense whorl of long sensory filaments,
whereby the outer part of the antenna acquires a brush-like appearance. Inferior
antenme of same structure in the two sexes, rather stout, flagellum very small,
with 3 4 extremely minute terminal joints, carrying a dense brush of bristles.
1st pair of legs likewise of a similar appearance in the two sexes, propodos large,
oval, set obliquely on the short carpus, palm deeply
concave, and armed with a
row of flattened denticles, thumb-like process very prominent. The 2 succeed-
ing pairs of legs with the propodos in female comparatively short, subquadrangular,
palm defined below by a distinct angle, that in male much longer, pyriform,
palm occupying the whole lower edge. First pair of pleopoda having the outer
plate oblong oval, gradually widening distally. Uropoda
with the inner ramus
rather narrow, and reaching considerably beyond the telson, terminal joint about
the length of the proximal one. and having at the tip a dense brush of slender
bristles, outer ramus broadly c:jrdiform, arching
over the base of the telson. so
as almost to meet the corresponding ramus on the other side in the middle,
edge smooth, only clothed with scattered bristles. Telson in male broad, scarcely
more than twice as long as it is broad, in female considerably narrower, edges
smooth, except at the tip, which carries 2 long and 2 short bristles. Colour a
pure white. Length of female 7 mm., of male H'/o mm.
Remarks. By its extremely slender, filiform body, this form is easily re-
cognized from most other Anthuridce, though the species of Antht'litra and Hijsstn'n
in this respect would seem to approach it. On account of its pure white colour
and comparatively small size, it may at first sight
be mistaken for a Tanaid.
Oci.-iirrenee. I first detected this form at Hvitingso, outside Stavanger.
in a depth of 150 200 fathoms, and have subsequently taken it in the inner
part of the Stavanger Fjord at Jelse, as also rather plentifully in the Trondhjem
Fjord in similar depths. It is a rather sluggish animal, creeping slowly along the
bottom. At times it is seen to bend its body almost in a circle ; but I have
never seen it make any attempt to swim, though the structure of the pleopoda
seems to admit of such a motion,
at least in the male sex.
Distribution. -Stat. 22 of the Porcupine Expedition,
(Norm. & Stebbing).
7 Crustacea.
located off Lisbon