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peduncle. Kpignath of the maxillipeds with the outer edge angular in the middle.
1st pair of legs with the carpus about the length of the 2 preceding joints coin-
Lined, and armed inside with 18 20 spines; dactylar claws in all pairs nearly
equal. Middle piece of male operculum not expanded at the end, which is qua-
drilobate. Uropoda exceeding in length the caudal segment, basal part rather
elongated, though not quite as long as the inner ramus, outer rainus somewhat
smaller than the inner, both being linear in form. Colour yellowish, densely
mottled with reddish brown specks. Length of adult female 7 mm., of male 10 mm.
Remarks. This is the first described species of the genus, and is easily
recognizable from the other as yet known forms, by the form of the cephalon and
the armature of the caudal segment. The Henopomus muticus of Kroyer is un-
doubtedly
identical with the form here treated off.
Occurrence. This species occurs along the whole Norwegian coast, from
the Christiania Fjord to Vadso, and is generally found in depths ranging from
30 to 100 fathoms, on a rocky bottom, overgrown with Hydroida and Polyzoa.
It is rather brittle, and therefore difficult to preserve in a perfect state. The
long inferior antenna and the uropoda are especially liable to be broken or de-
tached from the body, when the animal is put in alcohol.
Distribution. British Isles (Sp. Bate), Kattegat (Meinert), Dutch coast
(Hoek), coast of France (Bonnier), Greenland (Hansen).
Gren. 2. lanthe, Bovallius, 1881.
Generic Characters. General form of body as in lanira. Cephalon with
a strong rostral projection, and having the lateral parts produced to very pro-
minent, acute lappets. Segments of mesosome with the lateral parts laciniate,
and produced so as wholly to cover the coxal plates. Caudal segment forming
at the end, on each side, a triangular expansion. Antennae about as in lanira,
except that the inferior ones are comparatively less elongated. Epignath of
maxillipeds simple lanceolate, outer edge not angular. Oral parts otherwise, as
also the legs and appendages of metasome, nearly
as in lanira.
Remarks. This genus was established in the year 1881 by Dr. Bovallius,
to include a supposed new species from Baffin's Bay, I. speciosa, which, however,
in the opinion of Dr. Hansen, is not specifically distinguishable
from lanira
of Harger. The genus agrees very closely in almost all anatomical details