Ill 
sland; Dybden fra 290 til 620 Eavne. Alle Stationer til- 
0rer c * ei i kolde Area. 
Artens for Tiden bekjendte Udbredning i Nordhavet 
s isekker sig herefter fra den 63de til den Tide Bredegrad 
ha 16° 0. Xj. til 9° V. L. Men samme Form er ogsaa 
' S( ueret hinsides Atlanterhavet ved New Englands Kyst 
ai ’gw), og Norman bar sendt mig Exemplarer af samme 
. ^ | ra den engelske Expedition mod Valorous. Det synes 
Hl at at fremgaa, at mervserende Art bar en temmelig vid 
b^ogiafisk Udbredning i de nordlige Have. Den er, som do 
) <( t foregaaende omhandlede Arter af Slmgten Arcturus, 
anse som en regte arktisk Form. 
depth ranging from 290 to 620 fathoms. All the Stations 
in the cold area. 
The known distribution of the species, therefore, in 
the Northern Seas, extends at present from the 63rd to 
the 71st parallel of latitude, and from long 16° E. to long 
9° W. But the same form has been also observed on 
the other side of the Atlantic Ocean, off the coast of New 
England (Harger); and Mr. Norman has sent me examples 
of the same species, taken on the British Expedition with 
the “Valorous.” Hence, the present species would appear 
to have a rather wide geographical distribution throughout 
the tracts of the Northern Ocean. It must, in common 
with the previously described species of the genus Arcturus, 
be regarded as a true Arctic form. 
Fam. 2. Idoteidse. 
Glen. 1 . Grlyptonotus, Eights. 1853. 
Amr. Journal. Sciences, Ser. 2 Vol. XV. 
Synon. Qhiridotea, Harger. 
Slsegtscharacteristik. Legemet af mere eller mindre 
n ersmtsig Form, oventil jevnt hvselvet, med tydeligt mar- 
keret Or; 
bredt, 
kr 
-TWendse mellem For- og Bagkrop. Hovedet meget 
wed laterale, pladeforiuige Udvidninger. lste For- 
V| d'ssegment med Sidedelene fortilboiede; de ovrige med 
"bkilte, bagtil tilspidsede Epimerer. Bagkroppen sam- 
tnsa t af 4 tydeligt begrmndsode Segmenter, de 3 forreste 
A t stnaa, Endesegmentet stort og bagtil udtrukket i en 
0meue. ' ' 
ll de af Hovedet. 
u mov,. mi • j ' 1 " • ■ 1 ‘ 1 1 ' - mange- 
mede 
naar de er tilstede, paa den pvre 
2det Par Folere robustc med Skaftets 
Ip | U | 111016 e ^ er windre pladeformigt uclvidede, Svoben mai 
u ?• ^ forreste Fodpar ulige de ovrige, forsyn 
f<> | ( | S ^ air ^ e Grribehsender ; de 4 bagerste Par mgte Gang- 
plal 61 ' va ^ ve lfoi’inige Halevedhseng med 2 tydelige Ende- 
j e | ® ern Eerkninger. Nservserende af Eights fprst opstil- 
j lv ° blregt er isser udmserket ved Forholdet af Fodder ne, 
1> ° IVl ^ ^ forreste er mgte Griberedskaber, medens de 4 
e,,.^ 1 ^ 0 er vae sentlig forskjelligt byggede og forestiller de 
p? n tfigo Gangfodder. Foruden den nedenfor beskrevne 
1111 borer herhen den meget nmrstaaende Idotea Sabini 
(S °“, 01 '’ -f- wtomon Lin., 2 nordamerikanskel Arter Ch. caeca 
dot" (Stimpson), endelig en kjsempemssssig Art fra 
a l ts ^ige Polarhav, Gl. antarcticus Eights. Slsegten taeller 
aa ^ or Tiden 6 Arter, samtlige tilhorende de koldere Have. 
Fam. 2. Idoteidse. 
Gen. 1. Grlyptonotus, Eights. 1853. 
Amr. Journal Sciences, Ser. 2, Vol. XV. 
Synon. Chiridotca , Harger. 
Generic Character. — Body more or less thickset 
in form, uniformly arched above, with a distinctly defined 
boundary between the anterior and posterior divisions of 
the body. Head exceedingly broad, with lateral, lamelli- 
form dilatations. First segment, with its lateral parts 
anteriorly bent, the rest having well developed, posteriorly 
pointed epimera. Posterior division of body composed of 
4 distinctly defined segments, the 3 foremost exceedingly 
small, terminal segment large and posteriorly produced to 
a sharp point. Eyes, when present, on upper surface of 
head. Second pair of antennae robust in structure, with 
the joints of the peduncle more or loss lamelliform-dilatcd, 
flagellum multi-articulate. The three anterior pairs of legs 
differing from the rest, being provided with powerful pre- 
hensile hands. The four posterior pairs, true ambulatory 
legs. Valvular caudal appendages with 2 distinctly devel- 
oped terminal plates. 
Remarks. — The present genus, first established by 
Eights is chiefly distinguished by the characteristic structure 
of 'the legs, the 3 anterior pairs being true prehensile organs, 
whereas the 4 posterior have an essentially different struc- 
ture representing the true pereiopoda. Exclusive of the 
form described below, to this genus belong the closely ap- 
proximating, — Idotea Sabini, Erflyer; I. entomon, Lin.; 2 
North American species, Ch: caeca (Say) and Tuftsii (Stimpson); 
mid finally, a gigantic species from the southern Polar Sea, 
Gl antarcticus, Eights, all inhabiting the colder ocean tracts. 
