Tow 
regelmessig svingende rythmisk Bevegelse, som kun 
for kortere Tid ganske kan stoppes. Denne Be- 
vegelse har vesentlig respiratoriske Formaal, men 
er ogsaa af stor Betydning for Neringsoptagelsen. 
Ved disse Lemmers Spil frembringes nemlig inden- 
for Rygskjoldets Valvler en fortil gaaende Strom- 
ning af Vandet, hvormed de Smaapartikler, der tje- 
ner Dyret til Fede, hvirvles indenfor Munddelenes 
Omraade. Vandet strommer herunder i en conti- 
nuerlig Strem ud fra Rygskjoldets forreste Ende, 
nedenfor Pandepladen. Derfor holdes denne altid, 
under Branchialfoddernes Beveegelse, lige fortil strakt, 
medens den i Regelen, saasnart Beveegelsen stopper, 
beies nedad, hvorved den som en Klap tillukker den 
forreste Aabning af Rygskjoldet. 
Udbredning. Arten synes at have en ganske 
overordentlig vid geographisk Udbredning. Foruden 
ved Norges Kyster er den observeret i de arktiske 
Have, ved Gronland, Spitsbergen og Island, frem- 
deles ved Nordamerikas Ostkyst, ved de britiske 
Wer, og idethele langs hele, Europas Nordso- og 
Atlanterhavskyst, ligesom den ogsaa forekommer i 
Middelhavet, hvor den paa sine Steder, som i Golfen 
ved Neapel, ikke er ualmindelig. 
2. Nebalia typhlops. G. O. Sars. 
(Pl. 1, Fig. 4, Pl. IV, Fig. 9—19). 
Nebalia typhlops, G. O. Sars, Nye Dybvandscrustaceer fra Lo- 
foten; Chr. Vid. Selsk. Forh. f. 1869. 
Artscharacteristik. Meget lig foregaaende Art 
i sin almindelige Habitus, skjondt maaske lidt mere 
undersetsig af Form.. Rygskjoldet, seet fra Siden, 
af oval Form, lidt lavere fortil og med de nedre 
Kanter jevnt buede paa Midten. Pandepladen vel 
udyiklet, aflang oval, sterkt hvelvet oventil og for- 
synet i Enden med et spidst tornformigt Fremspring, 
@Minene yderst smaa og rudimentere, koniskt til- 
lebende i Enden, og uden Spor af Pigment eller 
Synselementer. De ovre Folere (hos Hunnen) for- 
holdsvis kortere end: hos foregaaende Art, med Svo- 
ben neppe lengere end Skaftet og kun sammensat 
af 10 Led, det bladformige Appendix temmelig for- 
lenget, nesten halvt saa langt som Svoben. De 
nedre Folere omtrent som hos N. bipes. Branchial- 
fodderne med Endopoditen meget tynd og sterkt 
forlenget, omboiet i Spidsen og forsynet med lange 
divergerende Fjerborster; Epipoditen med den dor- 
of life, and may through the semi-transparent inte- 
guments observe the pulsations of the heart, the 
peristaltic movements of the intestine, and the play 
of the branchial feet. These last, which have no 
influence whatsoever on the locomotion, we will 
usually find in a regular, swinging, rythmical mo- 
tion, which only for a short time may be quite 
stopped. That motion has chiefly a respiratory func- 
tion, but is also of great importance in securing 
the nourishment. By the play of these appendages 
there is produced, namely, inside of the valves of 
the carapace, a forward current of the water by 
which the small particles that serve the animal for 
food are drawn within the area of the oral parts. 
The water during this flows out in a continuous 
stream from the foremost extremity of the carapace 
below the frontal plate. It is therefore always held 
stretched straight forward during the motion of the 
branchial feet, whilst, as a rule, as soon as the 
motion ceases, it is bent downwards, by which action 
it, like a cover, closes the foremost aperture of the 
carapace. 
Distribution. The species seems to have quite 
an extraordinarily extensive geographical distribu- 
tion. Besides on the Norwegian coasts, it is ob- 
served in the Arctic seas, at Greenland, Spitzbergen 
and Iceland; further, off the east coast of North 
America, at the British Islands, and, as a whole, 
along the entire North sea and Atlantic coasts of 
Europe; and, it likewise occurs in the Mediter- 
ranean, where it, in certain places, such as the Gulf 
of Naples, is not uncommon. 
2. Nebalia typhlops. G. 0. Sars. 
(Pl. I, fig. 4, Pl. IV, figs 9—19). 
Nebalia typhlops, G. O. Sars, Nye Dybvandscrustaceear fra Lo- 
Aoten; Chr. Vid. Selsk. Forh. f. 1869. 
Specific Characters. Very like the preceding 
species in its general habitus, although, perhaps, a 
little more stumpy in shape. Carapace, viewed 
laterally, oval in form, a little lower in front, 
and with the lower edges evenly curved at the 
middle. Frontal plate well developed, oblongo-oval, — 
strongly arched above, and furnished at, the extre- 
mity with a pointed spiniform prominence. Eyes 
extremely small and rudimentary, passing into co- 
nical form at the end, and without trace of pig- 
ment or visual elements. Superior antenne (in 
female) relatively shorter than in the preceding 
species, with the flagellum scarcely longer than the 
peduncle and only composed of 10 joints; ~ the la- 
melliform appendage rather prolonged, almost half 
the length of the flagellum. Inferior antenne 
about as in N. bipes. Branchial feet with the 
endopodite very slender and greatly prolonged, 
