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Det samme gjælder ogsaa Bagkroppens
Svommeved-bæng og de ydre Halevedhæng.
Det midterste Halevedhæng viser ligeledes en meget
lignende Form, men skiller sig ved nøiere ^Undersøgelse
derved, at Spidsen ikke viser nogen Udrandning i Midten,
hvorimod den her er noget udbuet og til hver Side bevæbnet
med 3 meget smaa. men dog noget ulige udviklede Torner.
Farven er i levende Tilstand hvidagtig, med den
forreste Del af Bygskjoldet og Spidsen af Bagkroppen svagt
rodligt pigmenteret. Munddelene og Basis af Fødderne er
noget mere intenst rodfarvede.
Længden af det største erholdte Exemplar er 65°"";
men ialmindelighed er Størrelsen af fuldt udviklede
Individer betydelig mindre.
Udvikling. Ogsaa hos denne Art er de under
Hunnens Bagkrop fæstede Æg af paafaldende Størrelse og
derfor faa i Antal. Ved Dissection af samme har jeg kunnet
overbevise mig om. at ogsaa her Ungen forlader Ægget i
fuldt udviklet Tilstand, uden at gjennemgaa nogen
postembryonal Metamorphose.
Forekomst og Udbredning. Arten er forst opdaget
under den Østerrigsk-Ungarnske Nordpolexpedition i Havet
omkring Frantz Josephs Land og er beskrevet og afbildet
af Heller i ovenanforte Skrift som en Art af Slægten
Hippolyte.
Under vor Expedition har vi taget den paa ikke mindre
end 10 forskjellige Stationer, hvoraf de allerfleste tilhorer
den kolde Area, og fra et Dyb af 350—1100 Favne.
Dens for Tiden bekjendte geographiske Udbredning
strækker sig herefter fra den 63de til den 82de Bredegrad
og fra circa 2" Y. L. til 70° 0. L. og rimeligvis endnu
vitlere mod Øst.
At den ligesom foregaaende Art maa ansees som en
ægte arktisk Form. fremgaar tilstrækkeligt af de ovenfor
givne Data.
hibited by the said parts in the preceding species, that a
detailed description may be held as wholly superfluous.
The same remark applies, too, to the pleopoda, as
also to the outer caudal appendages.
The telson likewise exhibits a very similar form, but
differs, on closer examination, by reason of the point
having no emargination in the middle; here, however, it is
slightly curved, and on either side armed with 3 exceedingly
small, but somewhat unequally developed spines.
Colour, in a living state, whitish, the anterior part
of the carapax and the point of the abdomen being however
faintly tinged with reddish pigment. The oral appendages
and the base of the legs are somewhat more intensely
red-coloured.
Length of the largest specimen obtained 65"""; but
as a rule thé size of full-grown individuals is considerably
less.
Development. — In this species, too, the ova attached
beneath the abdomen of the female are remarkably large,
and therefore but few in number. By dissection, I have
convinced myself that the young of this animal also leave
the egg in a fully developed state, and accordingly do not
pass through any postembryonal metamorphosis.
Occurrence and Distribution. The species was
first discovered on the Austrio-Hungarian North Pole
Expedition. in the open sea, a short distance off Frantz Joseph’s
Land, and has since been described and figured by Heller
in the aforecited work, as a species of the genus Hippolyte.
On our Expedition, we obtained the species at not
less than 10 different Stations, by far the greater part
of which belong to the cold area, and from a depth of
350—1100 fathoms.
Hence, the geographical distribution of the species,
as known up to the present time, ranges from the 63rd
to the 82nd parallel of latitude, and from about long. 2°
W. to long. 70° E.. nay probably still farther east.
That the animal must, in common with the foregoing
species, be regarded as a true Arctic form, is manifest from
the data given above.
Fam. Ephyridæ.
Gen. HjTnenodora, G. O. Sars. 1877.
Prodromus descriptions Crust, etc.
Slægtscharacteristik. Legemet næsten trindt, ikke
sammentrykt fra Siderne. Integumenterne overordentlig
tynde og bøielige. næsten membranøse. Rygskjoldet fortil
i Midten kjolet og forsynet med et sammentrykt Pandehorn.
Fam. Ephyridæ.
Gen. Hymenodora, G. O. Sars. 1877.
Prodromus deseriptionis Crust, etc.
Generic Character. — Body almost round, not
compressed from the sides. Integuments exceedingly thin and
flexibile, almost membranaceous. Carapax keeled in the
middle anteriorly, and furnished with a compressed rostrum.
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