122 
Gen. 2. TVaxinoniscxxs, G. 0. Sars, 1869. 
Nye Dybvandscrustaceer fra Lofoten. 
Slsegtscharaeteristik. Legemet temmelig compakt, af 
oval Form, mecl hvaelvet Ryg og jevnt buede Sider. Seg- 
mcnterne fast forbundne med hinanden og kun adskilte ved 
smale laterale Indsnit. Hovedet meget stort, ikke skarpt 
afsat fra Kroppon. Bagkroppen bestaaende af et enkelt 
bagtil noget afsmalnende hvaelvet Segment. Ingen 0ine. 
lste Par Folere smaa, med rudimentaer eller meget kort 
Svobe; 2det Par forlamgede, med mangeleddet traadformig 
Svobe. Kindbakkerne med tydeligt udviklet Palpe. Alle 
Fodder af ens Udseende, noget tiltagonde i Laengde bagtil. 
Bagkroppens Operculum meget lidet, i Midten kjolet. Hale- 
vedhaengene saerdeles korte, tvegrenede eller enkle. 
Bemterkninger. Denne af mig i 1869 opstillede Slmgt 
er let lcjendelig ved det compacte, regelmaessigt ovale Legeme, 
paa hvilket hverken Hoved eller Bagkrop afmarkerer sig 
ved nogen ioinefaldende Indknibning. Mod foregaaende Slaegt 
stemmer den overens vod Foddernes ensformigo Bygning og 
den fuldstaendige Mangel af 0ine, men viser forovrigt kun 
liden Affinitet til samme. Slaegten indeholder for Tiden 2 
distincte Arter, nemlig den af mig ved Lofoten opdagede 
N. oblongus og den nedenfor naermere beskrevne Art. Begge 
er aegte Dybvandsformer. 
27. Nannoniscus bicuspis, G. 0. Sars, n. sp. 
(PI. X, Fig, 31—15). 
Nannoniscus bicuspis, Cr. 0. Sars, Prodromus descriptionis Crust, etc., 
No. 80. 
Artscharacteristik ?. Legemet aflangt ovalt, naesten 
3 Gange saa langt som bredt, oventil jevnt hvaelvet, med 
pladeformige afstumpcdc Epimerer. Hovedet jevnt afrundet 
og fortil i Midten kun dannende et ubetydeligt knudeformigt 
Fremspring. Bagkropssegmentet i Enden afkuttet med Side- 
hjornerue udtrukne i et kort bagudrettet tandformigt Frem- 
spring. lste Par Folere af Hovedcts Laengde, med tydelig 
4-leddet Svobe og normalt udviklede Sandscvedlueng; 2det 
Par Folere omtrent dobbelt saa lange, med Skaftets 2det 
Led dannende paa den yd re Side en stserlc udadrettet Torn, 
Svoben noget kortero end Skaftet og sammensat af 1 3 Led. 
Bagkroppens Operculum ubevaebnet. Halevedhaengene meget 
smaa, simple, af konisk Form. Farven livid. Lsengden 
2.90™. 
Gen. 2. Nannoniscus, G. 0. Sars, 1869. 
Nye Dybvandscrustaceer fra Lofoten. 
Generic Character. — Body rather compact, oval in 
form, with vaulted back and uniformly arching sides. Seg- 
ments connected firmly together, and separated only by 
narrow lateral incisions. Head very large, not sharply de- 
fined from succeeding segment. Posterior division of body 
consisting of a single, posteriorly somewhat tapering, arched 
segment. No eyes. First pair of antennae small, with either 
a rudimentary or a very short flagellum ; 2nd pair elongate, 
with a many-jointed, filiform flagellum. All of the legs 
uniform in appearance, their length slightly increasing pos- 
teriorly. Operculum of abdomen very small, and keeled 
along the middle. Caudal appendages exceedingly short, 
bifurcate or simple. 
Remarks. — The present genus, established by the 
author of this Memoir in 1869, may be easily recognized 
by the compact and regular, oval-shaped body, from which 
neither the head nor the abdomen is marked off by any 
conspicuous instriction. With the preceding genus it agrees 
in the uniform structure of the legs and the absolute want 
of eyes, but in other respects exhibits but slight affinity. 
The genus comprises at present 2 distinct species, viz. that 
which I met with off Lofoten, N. oblongus, and the species 
of which a detailed description is given below. Both are 
true deep-sea forms. 
27. Nannoniscus bicuspis, G. 0. Sars, n. sp. 
(PI. X, figs. 31 — 45'' 
Nannoniscus bicuspis , Gr. O. Sars. Prodromus descriptionis Crust, etc., 
No. 80. 
Specific Character. 9 — Body oblongo-oval, almost 
3 times as long as broad, above uniformly arched, with 
lamelliform-obtuse epimera. Head uniformly rounded, and, 
anteriorly, in the middle, merely forming a slight tubercu- 
liform projection. Abdominal segment cut off at the ex- 
tremity, with the lateral corners drawn out as a short 
posteriorly directed, dentiform projection. First pair of 
antennae equal in length to head, with a distinct four-jointed 
flagellum and normally developed sensory appendices; 2nd 
pair of antennae about twice as long, with 2nd joint of 
peduncle constituting on the outer side a strong outward- 
protending spine ; flagellum somewhat shorter than ped- 
uncle, and composed of 13 joints. Operculum of abdomen 
without any armature. Caudal appendages very small, 
simple, and conical in form. Colour white. Length 2.90"”". 
