81 
Af Munddelene er (se Fig. 21) Overleben (L) 
og Kindbakkerne (M) let at observere, og synes i 
alt veesentligt at ligne samme hos det voxne Dyr. 
Af nogen Mandibularpalpe er der intetsomhelst 
Spor at se, skjondt den ganske sikkert har existeret 
paa et tidligere Stadium. Underleeben og Kjeverne 
har jeg ikke kunnet noiere undersoge. 
Af Fodderne er de til Midtkroppen horende Par 
allerede taalelig vel udviklede, med alle sine Hoved- 
dele tydelige, hvorimod de bagre Par bliver i hoi 
Grad rudimentere, forestillende tilsidst meget smaa, 
utydeligt indskaarne Skiver uden enhver Borste- 
beseetning (Fig. 26). 
Forste Fodpar (Fig. 22) viser i Henseende til 
Enditerne endnu ingensomhelst Forskjel fra de neer- 
mest folgende Par (Fig. 23), og den yderste eller 
5te Endit, der hos det voxne Dyr er ganske rudi- 
menter, er her ligesaa vel udviklet som paa de fol- 
gende Fodder. Derimod er Exopoditen kjendelig 
mindre og kun forsynet med 8 Randborster, medens 
den paa 2det Par (Fig. 23) har ikke mindre end 14 
saadanne. llte Fodpar (Fig. 24) er endnu kun lidet 
udviklet og viser intet Tegn til nogen Aigkapsel. 
Exopoditen er paatvers oval og forsynet med en 
Rad af 9 forholdsvis korte Randborster. Epipoditen 
er meget liden, knudeformig, og Enditerne afstum- 
pede i Enden. Paa de folgende Par (Fig. 25) bliver, 
som ovenfor neynt, alle disse Dele endmere rudi- 
mentere, og tilsidst (Fig. 26) er der neppe mere 
end ubetydelige Spor af dem tilbage. 
"Af indre Organer skinner Tarmen meget tyde- 
ligt igjennem Integumenterne (se Tab. XI, Fig. 4) 
og er ialmindelighed fyldt med orangefarvede Con- 
tenta. Fortil udsender den 2 korte Blindsekke 
(Tab. XII, Fig. 21, 1), der hver klover sig i 2 Grene, 
hvoraf igjen enhver er svagt tvelappet i Enden. 
Dette er Begyndelsen til den hos det voxne Dyr 
saa voluminose og complicerede Lever. 
Et noget senere Stadium er fremstillet Tab. XI, 
Fig. 5. Legemet har nu en Lengde af omtrent 4 
mm. og er endnu halvt gjennemsigtigt, med et svagt 
gronagtigt Skjer og gulred gjennemskinnende Tarm. 
Rygskjoldet er nu forholdsvis noget storre, men 
endnu temmelig fladt, og Kroppen har strakt sig 
noget mere i Lengde. Forovrigt stemmer dette 
Stadium meget ner med det foregaaende, og 2det 
Par Folere fungerer fremdeles som Svommeredska- 
ber, skjondt de er noget reducerede i Storrelse, me- 
dens Fodderne synes mere udviklede. 
11 — G. O. Sars: Fauna Norvegizx. 
extremity with 3 ciliated bristles of unequal 
length. 
Of the oral parts (see fig. 21), the labrum (L) 
and the mandibles (M) are easy to observe, and seem 
in every essential particular to resemble those parts 
in the full-grown animal. There is no trace what- 
ever of a mandibular palp, though it must certainly 
have existed at an earlier stage. The posterior lip 
and the maxille 1 have not been able to examine 
closely. 
The pairs of legs belonging to the mesosome 
are already tolerably well developed, all their prin- 
cipal parts being distinct, whereas the posterior 
pairs become extremely rudimentary, appearing at 
last like very small, indistinctly indented lamelle, 
entirely without bristles (fig. 26). 
As regards the endites, the first pair of legs 
(fig. 22) presents as yet no difference whatever from 
the pairs immediately following (fig. 23), and the 
outermost or dth endite, which in the full-grown 
animal is quite rudimentary, is here just as well 
developed as in the succeeding legs. On the other 
hand the exopodite is perceptibly smaller, and fur- 
nished with only 8 marginal bristles, while that of 
the 2nd pair (fig. 23) has no less than 14 such 
bristles. The 11th pair of legs (fig. 24) is as yet 
only slightly developed, and shows no sign of any 
egg-capsule. The exopodite is transversely oval, and 
furnished with a row of 9 comparatively short mar- 
ginal bristles. The epipodite is nodiform and very 
small, and the endites are truncated at the extre- 
mity. In the succeeding pairs (fig. 25), all these 
parts become, as stated above, more and more rudi- 
mentary, until at last (fig. 26) there is hardly more 
than a slight vestige of them left. 
Of the internal organs, the intestine shows very 
distinctly through the integuments (se Pl. XII, fig. 4), 
its contents generally being of an orange colour. 
It sends out in front 2 short ceca (Pl. XIII, fig. 
21, 1), which each divide into 2 branches, each of 
which is in its turn slightly bi-lobed at the extre- 
mity. This is the commencement of the very volu- 
minous and complicated liver found in the full-grown 
animal. 
Pl. XI, fig. 5 represents a rather later stage. 
The body has now a length of about 4 mm. and is 
still semi-transparent, with a faint greenish tinge, 
and the yellowish-red intestine showing through. 
The carapace is now comparatively rather larger, 
though still somewhat flat, and the trunk has 
somewhat increased in length.- In other respects 
this stage agrees very closely with the preceding 
one, and the 2nd pair of antenne still officiate as 
swimming implements, though they are somewhat 
reduced in size, while the legs appear to be more 
developed. 
