152 
lste Par F olero. er temmelig forlmngede, med Sv 0 ben 
betydelig lsengere end Skaftet og bestaaende af 11 Led, 
hvoraf det lste er temmelig stort. Bisvpben erneppemere 
end halvt saa lang og sserdeles tynd saint 3-leddet. 
2det Par Falere er omtrent af samme Lcengde som 
lste Par og har Skaftets sidste Led ganske kort og Svoben 
bestaaende af 12 Led. 
lste Fodpar or temmelig svagt bygget, forovrigt af 
smdvanlig Form, med sidste Tied eller Haanden omtrent 
af det foregaaende Leds Lsengde og uoget skraat afskaaret 
i Enden. 
De 3 bagerste Fodpar er forholdsvis spinkle, men 
med bredt pladeformigt Hofteled. 
Sidste Par Halefedder (se Fig. 2 a ) er forholdsvis 
korte, mod npgne lancetformige Greno. 
Halevedhsenget (ibid.) rager noget udover Stammen 
paa sidste Par Halefqdder og er af triangulser Form sarnt 
ved et meget smalt Indsnit kloftet nsesten til Roden. 
Farven var paa det leveiule Dyr hvidagtig nden nogen 
tydelig Pigmentering. 
Lsengden overstiger neppe 5 1 / s mm . 
Forekomst og Udbredning. Et enkelt Exemplar af 
denne Idle Art toges under Expeditioneus 2det Togt i Havet 
mellem Jan Mayen og Island (Stat. 240) paa det betydelige 
Dyb af 1004 Fame. Da Stationen tilborer den kolde Area, 
er Arten utvivlsomt at botragte som en arktisk Form. 
Gen. 6. Acidostoma, Lilljeborg, 1865. 
On the Lysianassa magellanica etc. 
38. Acidostoma laticorne, G. O. Sars, Crust. 
(PI. XIII, Fig. 3, 3 a). 
Acidostoma laticorne, (l. 0. Sars. Crust, & Pycnogon. nova etc., No. 
17 . 
Artseharaeteristik. Legemet sserdeles underssetsigt, 
med stserkt udviklede Epimerer. Hovedet lidet, med Side- 
hjefmerne smalt tilrundede. 3die Bagkropssegments Side- 
plader bagtil noget udtrukne, men ikke tilspidsede; 4de 
Segment oventil noget sadelformigt indtrykt. Ingen 0ine. 
lste Par Folere overordentlig voluminose, med Skaftet sser- 
deles tykt, Svoben af Skaftets Lsengde, 7-leddct, lste Led 
meget stort, pladeformigt sammentrykt og i den bagre Kant 
ta?t cilieret, Bisvpben stserkt udviklet, 6-leddet. De 3 ba- 
gerste Fodpar overordentlig robuste, med stort nsesten fir- 
kantet Hofteled og 3dio Led sserdeles bredt og sammentrykt. 
The 1st pair |of antenme are rather elongate, with 
the flagellum considerably longer than the peduncle, and 
composed of 11 articulations, the 1st comparatively large. 
The secondary flagellulu is scarcely more than half as long, 
exceedingly slender, and composed of 3 articulations. 
The 2nd pair of antenna? are about of the same length 
as the 1st pair, with the last joint of the peduncle quite 
short and the flagellum consisting of 12 articulations. 
The 1st pair of legs are rather feeble in structure; 
for the rest, of the usual form, with the last articulation, 
or hand, about equal in length to the preceding, and some- 
what obliquely truncate at the extremity. 
The 3 posterior pairs of legs are comparatively slender, 
but with the basal joint broadly lamelliform. 
The last pair of caudal stylets (see fig. 2 a) are 
comparatively short, with naked, lanceolate branches. 
The telson (ibid.) projects a little over the trunk 
on the last pair 'of caudal stylets, is triangular in form, 
and cleft [by an exceedingly narrow incision almost to the 
base. 
Colour in the living animal whitish, without any dis- 
tinct pigmentation. 
Length scarcely exceeding 5 1 //"”. 
Occurrence and Distribution. — A single specimen of 
this small species was taken, on the 2nd cruise of the Ex- 
pedition, in the tract of ocean between Jan Mayen and 
Iceland (Stat. 240), at the considerable depth of 1004 fathoms. 
This Station being in the cold area, the species may un- 
questionably be regarded as an Arctic form. 
Gen. 6. Acidostoma, Lilljeborg, 1865. 
On the Lysianassa magellanica etc. 
38. Acidostoma laticorne, G. O. Sars, n. sp. 
(PI. XIII, fig. 3, 3 a). 
Acidostoma laticorne , Or. O. Sars, Crust. & Pycnogon. nova etc., No. 
17. 
Specific Character. — Body exceedingly thickset, with 
very fully developed epimera. Head small, with lateral 
corners narrowly rounded. Lateral plates . 3rd abdominal 
segment somewhat produced posteriorly, but not pointed; 
4th segment, saddle-shaped as it were above. No eyes. 
First pair of antenna? remarkably robust, with peduncle ex- 
ceedingly thick, flagellum same length as peduncle, seven- 
jointed, 1st articulation very large, lamelliform-coinpressed, 
and densely ciliated along the posterior margin; secondary 
flagellum strongly developed, six-jointed. The 3 posterior 
pairs of legs exceedingly robust in structure, with basal joint 
