121 
lste Par F olere skiller sig kun lidet i sin Bygning 
ra samme hos Slfegten Janira. Svoben er meget boielig 
°8 sammensat af et stort. Antal af korte Led. 
2det Par Folere riser den ssedvanlige vinkelformige 
lining ng er ]j„ e lu | s t)-akte lsengere end Halvparlen af 
e g°niet. Skaftets 2 forsteLed gaar paaYdersiden ud i en 
stserk, skraat udadrettet tornformig Fortsats. 3die Led er' 
s;ei deles lidet, hvorimod de to folgende er mere forlanigede 
al cylindrisk Form. Sv 0 ben er omtrent af Skaftets 
;<i ngde og sammensat af talrige korte Led. 
Munddelene kunde ikke noiere unders0ges paa Grund 
a ffianglende Materiale. 
lste Par Fgdder (Fig. 8), der bos Slregten Janira 
'gesotn hos de flestc 0vrige til denne Familie horende Former 
61 stmrkere byggede end de ovrige og uddauncde til Gribe- 
^dskaber, er her fuldkommen af samme enkle Form og 
l seende som de folgende Par og ligesom disse aegte Gang- 
fi der. Sidste Led er nemlig ikke udvidet, men simpelt 
C ' ' u< Jriskt, og Endekloen er ganske kort og kan ikke fnld- 
st *ndig boles ind mod hint. 
,,, B^gkroppen dmkkes (se Fig. 29) paa Undersiden i 
' ( lten af en enkelt tvnd, operkelformig, hvselvet Plade, 
11 ^ )res tiller det lste Par modificerede Buglemmer. Under 
euile Plade Andes de 4 ovrige Par Buglemmer, der alle 
<e gte Respirationsoreaner, med blode, menibranpse Ende- 
Plade 
lor. 
Halevedhaengene (Fig. 30) er kun lidet mere end lialvt 
Saa ^ an S e som Bagkroppen og rettede lige bagud. De be- 
? aar en staerkt forlamget, cylindrisk og i Kanterne borste- 
Hjsat Stamme, der ved Enden paa den indre Side lpber 
1 et kort tandformigt Fremspring, og 2 meget korte 
tilspidsede Grene. Den indre Gren er storst og 
0 Inblt af Stammens halve Lrnngde ; den ydre Gren er 
p 1 ' 1 deles liden, neppe halvt saa Lang som den indre. Begge 
iene er j Kanterne og ved Spidsen besatte med fine 
Borster. 
Det liele Legeme var i levende Tilstand hvidagtigt, 
Sjennemsigtigt, uden ethvert Spor af Pigmentafleiringer. 
Lauigden af det undersogte Exemplar var 12 7 "'". 
j, Porekomst og Udbredning. Et enkelt fuldvoxent 
x< niplar af denne ved sit piggede Udseende characteri- 
Izopode erholdtes under Expeditionens 2det Togt i 
8 avet Vfi st af Lofoten (Stat. 164) fra etDyb af 457 Favne. 
ai >) Hies teds fandtes ogsaa et Par meget smaa Unger til- 
l01 enfie samme Art. 
Stationen tilliorer den kolde Area, er det at for- 
0Ce > at dens Udbredningsfelt kun er indskrsenket til de 
"ktiske Parvande. 
The 1st pair of antennae differ but very slightly as 
to structure from those in the genus Janira. The flag- 
ellum is very flexible, and composed of a large number of 
short joints. 
The 2nd pair of antenna? exhibit the nsual angular 
curvature, and, when fully stretched, exceed hall the body 
in length. The 2 first joints of the peduncle jut forth on 
the outer side, as a strong, oblique, outward-directed, spini- 
form projection. The 3rd joint is exceedingly short, whereas 
the 2 succeeding joints are more elongate, and cylindrie in 
form. The flagelium has about the length of the peduncle, 
and consists of numerous short joints. 
The oral appendages could not be closely examined 
from want of sufficient material. 
The 1st pair of legs (fig. 28), which in the genus 
Janira, as in most other forms belonging to this family, 
are more powerful in structure than the others, and de- 
veloped as prehensile organs, have the same simple form 
and appearance as the succeeding pairs, and are, like those 
legs, true pereiopoda. The last joint, namely, is not di- 
lated, but simple-cylindric, and the terminal claw, being 
quite short, does not admit of being fully bent in towards 
the joint. 
The posterior division of the body (see fig. 29) is 
covered on the under side, in the middle, by a thin, oper- 
culiform, arcuate plate, representing the 1st pair of modi- 
fied ventral limbs. Beneath this plate, occur the 4 remain- 
ing pairs of limbs, all of them true respiratory organs, 
with soft, membranous terminal plates. 
The caudal appendages (fig. 30) are but little more 
than half as long as the posterior division of the body, 
and directed straight backwards. They consist of an ex- 
ceedingly elongate, cylindrie, and, along the edges, setiferous 
trunk, jutting out at the extremity as a short, dentiform 
projection, with 2 exceedingly short, acuminate branches. 
The inner branch is the larger of the two, measuring not 
quite half the length of the trunk; the outer is remarkably 
small, scarcely half as long as the inner. Both branches are 
■ beset along the edges and at the point with delicate bristles. 
In a living state, the whole body of the animal was 
whitish, translucent, without a trace of pigment. 
Length of the specimen examined 12**. 
Occurrence and Distribution. — A single, full-grown 
specimen of this Isopod, characterized by its spiniferous 
appearance, was taken on the 2nd cruise of the Expedition, 
in the open sea, west of Lofoten (Stat. 164), at a depth ol 
457 fathoms. In the same locality, were also obtained two 
exceedingly young individuals belonging to the same species. 
The Station being in the cold area, the region through- 
out which this animal is distributed may be held to lie 
exclusively within the limits of the Arctic Sea. 
ben 
norske Nordliavsexpedition. 
10 
G. O. Sars: Crustacea. 
