118 
2det Par Fglere (ibid.) er temmelig stserkt forlaengede, 
omtrent af Legemets halve Lrengde, og bar Skaftets Led 
simpelt cylindriske. Svpben er kvngere end Skaftet og sam- 
mensat af omtrent 14 korte Led. 
Mnnddelene kuncle ikke paa det eneste forliggende 
Exemplar npiere nndersoges. 
Af Fodderne er alene lste Par (sc Fig. 25) ndviklet 
til Griberedskaber af en lignende Bygning som de 3 forreste 
Par hos Glyptonotus. Derimod er alle de ovrige Par mgte 
Gangfpdder, med sidste Led simpelt cylindriskt og Ende- 
kloen ganske kort samt forsynet med en secundrer Torn. 
De klapformige Halevedhseng (se Fig. 26) er forholdsvis 
mindre udviklede end hos foregaacnde Slmgt og drekker paa 
langt nser ikke hele Undersiden af Bagkroppen. De viser 
over Midten en skraat lobende eller diagonal Kjol og bar 
ved Spidsen en enkelt, temmelig stor triangular Endeplade. 
Farven var hos det levende Dyr temmelig mark. nae- 
sten chocoladefarvet, med enkelte uregelnnessige rpdbrune 
Shatteringer. Det undersogte Individ havde desuden over 
Midten af 2dct Par Foleres Svobe et mcgot ioinefaldende 
smukt carminrodt Tvairbaand. Hvorvidt dette Tvmrbaand 
er characteristisk for Arten eller blot en individuel Eien- 
dommelighed, maa overlades til fremtidige Undersogelser at 
afgjore. 
Lsengden af det undersogte Exemplar var 14”"". 
Porekomst og Udbredning. Det eneste erholdte Ex- 
emplar, der var en fuldt ndviklet Hun, optoges under Ex- 
peditionens sidste Togt i Magdalencbay, en af iskoldt Vand 
opfyldt Fjord paa Nordvestsiden af Spitsbergen, fra et Dyb 
af 40 — 60 Favne. 
Arten bar en temmelig vid Udbredning i de arktiske 
Have og synes at vsere circumpolar. Foruden ved Sp>its- 
bergen er den observeret ved Nordamerikas 0stkyst (New 
England), Polaroerne, Alaschka og Behringsstrfedet. Ifolge 
Stuxberg forekommer den ogsaa ikke ualmindeligt i det 
nordsibiriske Hav sammen med Glyptonotus Sabini og entomon. 
Tribus 4. Asellota, Edw. 
Bemserkninger. Hos de herhen hprende Former, 
der maa betragtes som de mest typiske Isopoder, er Hale- 
vedhsengene terminale som hos lste Tribus (ehelifera) og 
enten tvegrenede eller simple, men aldrig modificerede hverken 
til en Halevifte eller til Klapper. Heller ikke er nogen 
af Bagkropslemmerne saaledes som hos de foregaaende 
Grupper uddannedc til Svommeredskaber, hvorimod det 
The 2nd pair of antenna 1 (ibid) are considerably elon- 
gate, about half as lopg as the head, and have the joints 
of the peduncle simple cvlindric. The flagellum is longer 
than the peduncle, and composed of about 14 short joints. 
The oral appendages could not be submitted to a 
closer examination in the solitary specimen secured. 
Of the legs, the 1st pair alone (see fig. 25) are 
developed as prehensile organs, of a similar structure to 
that exhibited by the 3 foremost pairs in Glyptonotus. On 
the other hand, all the rest are true pereiopoda, having 
the last joint simple cylindric and the terminal claw 
exceedingly short, as also furnished with a secondary 
spine. 
The valvular caudal appendages (see fig. 26) are com- 
paratively less developed than in the preceding genus, not 
covering by far the entire under-surface of the posterior 
division of the body. Across the middle, they exhibit an 
obliquely extending, or diagonal, carina, and have at the 
point a single, rather large, triangular terminal plate. 
The colour in the living animal was rather dark, 
closely approximating that of chocolate, with a few irregular 
reddish-brown shadings. The specimen examined had, 
moreover, across the middle of the flagellum of the 2nd 
pair of ante nine an exceedingly conspicuous transverse band, 
of a brilliant carmine. Whether this transverse band be 
characteristic of the species or a mere individual peculi- 
arity, must be left for subsequent investigation to decide. 
Length of the specimen examined 14”"". 
Occurrence and Distribution. — The solitary specimen 
obtained, a fully developed female — was brought up on the 
last cruise of the Expedition, from a depth of 40 — 60 
fathoms, in Magdalena Bay, a fjord, filled with ice-cold 
water, on the north-west coast of Spitsbergen. 
The species has a rather extensive distribution through- 
out the Arctic Seas, and would appear to lie circumpolar. 
Exclusive of Spitzbergen, it has been met with on the 
east coast of North America (New England), off the Polar 
Islands, Alaschka, and in Behring’s Straits. According to 
Stuxberg, it occurs, too, and not infrequently, in the 
North Siberian Sea; along with Glyptonotus Sabini, and 
G. entomon. 
Tribus 4. Asellota, Edw. 
Remarks. — The forms belonging to this division of 
the Crustacea, that unquestionably must lie regarded as 
the most typical of Isopods, have the caudal appendages 
terminal, ns in the 1st tribe (ehelifera), and either bifurcate 
or simple, but never modified, either to form a caudal flabel- 
lum or valvular organs. Nor do any of the abdominal 
limbs, as in the preceding groups, occur in the form of 
