49 
Fig. 5) viser et lignende Forhold som hos den typiske Art. 
P- obesa. idet IstePav er ganske rudimentsert og af samme 
Ddseende som lios Hunnen. medens de ovrige er udviklede 
til kraftige S v 0 m me r e d ska b e r med to 8-leddede Grene. 
Det midterste Halevedhseng (Fig. 10) er som hos de 
svrige Arter aflangt-trjangulaert, med Sidekanterne glatte 
og Spidsen smalt udtrukken, men skiller sig vmsentlig ved 
dennes Bevaebning. Til den i Midten noget udbuede Ende- 
i‘and er nemlig (Fig. 11), foruden 2 mediane Borster, frestet 
til liver Side 3 Torner af nsesten ens Storrelse. medens der 
hos alle de ovrige bekjendte Arter kun findes 2 saadanne 
°g disse meget ulige i Storrelse. 
De ydre Halevedhseng liar den indre Plade (Fig. 12) 
hetydelig kortere end den ydre og langs den indre Kant 
under llandborsterne forsynet med en Rad at smaa Torner, 
der mesten strselcker sig til Pladens Spids. Horeapparatet 
v ed Basis er tydeligt udviklet. skjondt Otolithen er at tor- 
holdsvis ringere Storrelse end SEedvanligt. 
I levende Tilstand er Dyrets Legeme tenimelig gjen- 
nemsigtigt og prydet med et noget diffust smukt lyserodt 
Figment, der paa Bagkroppen danner mere eller mindre 
fuldstsendige Tvserbaand. Munddelene og Fodderne er in- 
tensivt rpdfarvede, ligeledes den store i den forreste Del 
af Forkroppen gjennemskinnende Mave. 
Laengdcn af den fuldt udviklede Han er iulde 26’™, 
on Storrelse, som ikke nogen af de tidligere bekjendte 
Arter paa langt lucr opnaar. 
Forekomst og Udbredning. 2 temmelig vel vedlige- 
holdte Exemplarer, en yngre Hun og en fuldt udviklet Han, 
hlev under Expeditionens lste Togt optaget i Bundskrabeu 
fra et Dyb af 417 Favne i Havet udenfor Storeggen (Stat. 
'1 1 )■ Et andet, men i hoi Grad mutileret Exemplar, ei- 
holdtes under 2det Togt paa en vidt adskilt Lokalitet, 
nemlig i Havet SY af Jan Mayen (Stat. 237). Dybden 
263 Favne. 
Da de to omtalte Stationer begge tilhorer den kolde 
Area, og Arten er fundet paa begge Sider af Nordkavets 
store Dyb, er man berettiget til at slutte, at den ligesom 
toregaaende Myside er en aegte arktisk Form, der rimeligv is 
er udbredt over den hele kolde Area, hvor Dybdeforhold 
°g Bundens Beskaffenhed er egnet for dens Trivsel. 
(see tig. 0 ) are precisely similar to those in the topical 
species, P. obesa, the 1st pair being quite, rudimentary and 
of the same appearance as in the female, whereas the 
others are developed into powerful natatory organs, with 
2 eight-jointed branches. 
The telson (fig. 10), as in the other species, oblongo- 
triangular, with the lateral margins smooth and the point 
slenderly produced; its armature however exhibits a very 
striking specific character. To the terminal margin, some- 
what arched in the middle, are attached on either side (fig. 
11), exclusive of 2 median bristles, 3 spines, about equal 
in size, whereas 2 only, and those ot vei’y unequal size, 
occur in all other known species. 
The outer caudal appendages have the inner plate 
(fig. 12) considerably shorter than the outer, and furnished 
along the inner margin, beneath the bristles, with a row 
of small spines, reaching almost to the point of the plate. 
The auditory apparatus at the base distinctly developed, 
although the otolith is comparatively much smaller in size 
than usual. 
In a living state, the body of the animal is well-nigh 
translucent, and beautifully coloured with a somewhat dif- 
fuse. light-red pigment, which, on the posterior division of 
the body, forms more or less perfect transverse bands. 
The oral appendages and the legs are of a vivid red, as 
also the large stomach, seen shining through the anterior 
part of the cephalo-thorax. 
Length of the fully developed male 26'™, a size far 
outreaching that of any previously known species. 
Occurrence and Distribution. — Two specimens, in 
a state comparatively good, a young female and a fully 
developed male, were brought up, on the first cruise of the 
Expedition, in the dredge, from a depth of 417 fathoms, 
in the open sea, off the Storeggen bank (Stat. 31). Another, 
but very mutilated example, was obtained on the second 
cruise, in a widely different locality, viz. in the open sea 
south-west of Jan Mayen (Stat. 237), from a, depth of 263 
fathoms. 
The two aforesaid Stations having both belonged to 
the cold area, and the species been found on either side 
of the great ocean valley of the North Atlantic, we are 
warranted in regarding this animal, equally with the pre- 
ceding species, as a true Arctic form, distributed in all 
probability throughout the whole of the cold area where 
the depth and nature of the bottom are favourably adapted 
for its existence. 
ben norske Nordhavsexpeditoin. G. 0. Sars: Crustacea. 
