129 
Uu< ei ®6naevnelsen Isopoda remigantia. Jeg or imidlertid 
lu fuldkomnien enig rned Prof. Lilljeborg i, at de omhand- 
? C 1 * ormor i alle andre Henseender slutter sig saa mer 
1 di- egentlige Asellider, at de neppe kau skilles fra disse 
< n sierskilt Tribus, skjondt de efter min Mening. vel for- 
J e |>< i at sammenstilles i en egen Famiiie. Typen for Fa- 
^ 1,11 er den af min Fader opstillede Slaigt Munnopsis med 
itrn M. typica. Foruden denne har jeg kunnet foie endnu 
3 1 lst * llc t-e Slaegter til Familien. nemlig Eurycope, Ilyarachua 
e esm °soma, enhver repraesenteret af flere Arter. 
by the name of Jsopoda remigantia. Now, however, I 
quite agree with Professor Lilljeborg, that the forms in 
question approximate in all other respects so closely the 
true Asellidm as hardly to admit of being separated from 
the latter into a new tribe, though, in .my judgment, they 
might well be comprised within a special family. The 
type of the family is the genus Munnopsis, established by 
my father, the late Professor Dr. Michael Sars, with the 
species M. typica. Exclusive of Munnopsis, I have myself 
been enabled to add 3 distinct genera to the family, viz. 
Eurycope, Ilyarachna, and Desmosoma. each represented by 
several species. 
Gen Eurycope, G. 0. Sars. 1863. 
Om en anomal Cfruppe af Isopoder. 
Slaegtacharacteristik. Legemet af oval Form, noget 
ec ti\kt, med det forreste og bagerste Parti af Legemet 
imdie skarpt begraendsede. Hovedet bredt, til liver Side 
la ndet for Fsestet af Folerne. De 4 forste Forkrops- 
^ egiiionter korte, oventil paa tvmrs indhtilede, de 3 bagerste 
) ^-G^-lig storre og oventil stserkt convexe. Bagkropsseg- 
^loiiM-t stort og bredt, skjoldformigt. lste Par Fgflere med 
a ets Lste Led meget stort, skjselformigt, Svpben smal, 
la -i'geleddet. 2det Par Fplere sterlet forlsengede, med 
V0 en Guigere end Skaftet. Kindbakkerne staerkt byggede 
e tydelig Palpe. Kjmvefodderne pladeformige, med Pal- 
lls -d(>t og 3die Led sserdeles brede, de 2 ydre smale, 
tv ’ l,u nde tilsammen en ufuldkommen Sax. lste Fodpar be- 
^ 0 lg korte re end de ovrige, meget smalt, ikke prehensilt; 
3 folgende Par sterlet forliengede. De 3 bagre Fodpar 
s ( 'nldanuede til kraftige Svommeredskaber af ens Ud- 
^^'de, med de 2 ydre Led aarebladformigt udvidede og 
n < i‘kloen mere eller mindre rudimenter, stiletformig. Hale- 
'Pdhsengene 
smaa, tvegrenede. 
act Boni£er kninger. Hos nservserende Sliegt er den Char- 
c ^ er udmaerker Familien Munnopsidce, nemlig den 
sl'nl ' ,f ' 1 ' ( Gg e Omfor mning af de bagre Fodder til Svommored- 
H V S kurpest og tydeligst udprseget, og den kan derfor 
act, * >e ^ ra 2^ es som den most typiske i Familien. Char- 
L„° llS t* s k f° r Slasgten ligeovorfor de ovrige er fremdeles 
3 ^ compakte Form, den ligelige Udvikling at 2det, 
lief ^ °dpar samt af Svommefodderne, og de tyde- 
ibc • e 8 re nede Halevedhseng. Sliegten trnller for Tiden, 
dr* ^ en nedenfor mermere beskrevnc Form, ikke min- 
ei 'd 9 forskjellige Arter, livoraf de 8 tilhorer Nordhavet, 
111 nors ke Nordliavsexpedition. G. O. Sars: Crustacea. 
Gen. Eurycope, G. 0. Sars, 1863. 
Om en anomal Gruppe af Isopoder. 
Generic Character. — Body oval in form, some- 
what depressed, with the anterior and posterior sections 
not very sharply defined. Head broad, oil either side 
emarginate, for the attachment of the antenme. The four 
anterior segments short, above transversely hollowed; the three 
posterior much larger, and very considerably arched above. 
Abdominal segment large and broad, scutiform. First pair 
of antenha; with 1st joint of peduncle very large, squami- 
fonn; flagellum slender, multi-articulate. Second pair of 
antennae greatly produced, with flagellum longer than ped- 
uncle. Mandibles powerful in structure, with a distinct 
pa lp. Maxillipeds lamelliform, with 2nd and 3rd articula- 
tions of palp exceedingly broad, the 2 outer ones slender, 
constituting an imperfect chela. First pair of legs con- 
siderably shorter than the rest, exceedingly slender, non- 
prehensile; the 3 succeeding pairs greatly produced. The 
3 posterior pairs of legs all developed as powerful natatory 
organs, uniform in appearance, with the 2 outer articula- 
tions dilated like the blade of an oar, and the terminal 
claw more or less rudimentary, styliform. Caudal appen- 
dages small, bifurcate. 
Remarks. — In tlie present genus, the character 
distinguishing the family Munnopsidce, viz. the remarkable 
transformation of the posterior legs into natatory organs, 
is most prominently and conspicuously developed; and hence 
Eurycope may properly be regarded as the most typical genus 
of the family. Peculiar, too, for this genus, as compared 
with the other genera, is the compact form of body, the 
equable development of the 2nd, 3rd, and 4th pairs of 
legs as also of the posterior or natatory pairs, and the 
distinctly bifurcate caudal appendages. The genus com- 
prises at present, inclusive of the form described in detail 
