den ovrige Krop. Hovedet er temmelig tykt, lige- 
som opsvulmet i sit dorsale Parti, og stumpt 
afkuttet fortil, uden Spor af noget Rostrum. Det 
forlenger sig bagtil paa Undersiden i en meget 
voluminos Plade, der hvelver sig ud over Bugsiden 
af Dyret og ender i en smal, konisk tillobende Fort- 
sats. Denne Plade er den enormt udviklede Over- 
lebe (labrum). I det indre af Hovedet helt fortil 
bemerkes i Midten en meget ioinefaldende blodred 
Pigmentmasse af noget uregelmessig Form: det 
enkle Mie. Af de sammensatte Gine er der derimod 
intetsomhelst Spor at se. Af Lemmer findes kun 
3 Par, de saakaldte Nauplius-Lemmer, alle tilhorende 
det forreste Afsnit af Legemet og representerende 
de 2 Par Folere og Mandibularfodderne. Det for- 
reste Par (a') (Iste Par Folere) er dog saa smaa og 
rudimentere, at de let kan oversees, og er heller 
ikke bemerkede af Lereboullet. De har Formen af 
2 ubetydelige knudeformige Fremspring til hver Side 
af den forreste Ende af Hovedet og noget ventralt, 
hver forsynet med en enkelt delicat Foleborste (se 
ogsaa Fig. 5a). Det 2det Par Lemmer (a’), der re- 
presenterer 2det Par Folere, er derimod af serdeles 
betydelig Storrelse, forestillende et Par kraftigt ud- 
viklede, til Siderne udstrakte Aarer nesten af hele 
Legemets Lengde. Enhver af disse Lemmer bestaar 
af et tykt cylindriskt Skaft og 2 noget ulige ud- 
viklede Endegrene. Skaftet har ved Basis i Bag- 
kanten en konisk Fortsats, der ender med en kort 
borsteformig Spids, og ved dets Ende findes, lige- 
ledes i Bagkanten, en lignende, med en noget len- 
gere bagudkrummet Borste endende Fortsats. Af 
Grenene er den ovre eller forreste noget storre end 
den anden og omtrent af Skaftets halve Lengde. 
Den er noget opsvulmet paa Midten, nesten ten- 
formig, og viser en meget utydelig Leddeling, samt 
berer 5 leddede, men endnu ucilierede Svomme- 
berster, hvoraf de 3 udgaar fra tilsvarende Afsatser 
i den bagre eller ydre Kant, de 2 ovrige fra Spidsen. 
Den bagre Gren er simpelt cylindrisk og delt i 
2 utydeligt sondrede Led, hvoraf det yderste har 
ved Spidsen 3 Borster af et lignende Udseende som 
de paa den forreste Gren. Det 3die Par Lemmer 
(Mp), de saakaldte Mandibularfodder, hvoraf intet 
Spor findes hos det voxne Dyr, udgaar omtrent fra 
Midten af Legemet, paa Greendsen mellem Hoved og 
Krop, og er ligesom 2det Par udstrakte til hver 
Side, skjondt sedvanlig noget mere bagudboiede. 
De udspringer hver fra en noget fortykket, knude- 
formigt fremspringende Basis, som forestiller det 
endnu uudviklede Corpus af Kindbakkerne. Hver 
Mandibularfod bestaar af 3 utydeligt sondrede Led, 
hvoraf det Iste er storst og forsynet i Bagkanten 
med 2 pigformige Borster. 2det Led berer en 
enkelt lignende Borste, og sidste Led i Spidsen 
3 saadanne. Den bagenfor liggende Del af Legemet 
er uden Spor af Lemmer og af aflang oval Form, 
101 
remainder of the body. The head is rather thick 
and as it were swollen in its dorsal region, and is 
bluntly truncated in front, without any trace of a 
rostrum. It is produced posteriorly on the inferior 
side to a very voluminous plate, which arches over 
the ventral side of the animal and ends in a narrow, 
conical projection. This plate is the enormously 
developed upper lip (labrum). Inside the head, in 
the middle right in front, a rather irregularly- 
shaped, very conspicuous mass of blood-red pigment 
is visible, — the ocellus. On the other hand, there 
is no trace whatever of the compound eyes. There 
are only 3 pairs of limbs, the so-called nauplius 
limbs, all belonging to the anterior section of the 
body, and representing the 2 pairs of antenne, and 
the mandibular legs. The foremost pair (a) (the 
1st pair of antenne) are, however, so small and 
rudimentary, that they can easily be overlooked, 
and have not, indeed, been noticed by Lereboullet. 
They are in the shape of 2 small, nodiform protu- 
berances one on each side of the front end of the 
head, and somewhat ventral, each furnished with a 
single delicate sensory bristle (see also fig. 5 a). 
The 2nd pair of limbs (a*), which represent the 2nd 
pair of antenne, are, on the other hand, of very 
considerable size, forming a pair of powerfully 
developed oars, extended laterally, and almost as 
long as the body. Each of these limbs consists of 
a thick cylindrical scape, and 2 rather unequally 
developed, terminal rami. At its base, in the hind 
margin, the scape has a conical projection, ending 
in a short, bristle-like point, and at its end, also in 
the hind margin, a similar projection ending in a 
rather longer bristle bending backwards. Of the 
two rami the upper or foremost one is rather larger 
than the other, being about half the length of 
the scape. It is somewhat swollen in the middle, 
almost fusiform, and exhibits a very indistinct arti- 
culation; it also carries 5 jointed, but not as yet 
ciliated natatory bristles, 3 of which issue from 
corresponding ledges in the hinder or outer margin, 
the other 2 from the point. The hind ramus is 
of a simple cylindrical shape, and is divided into 
2 indistinctly defined joints, the outer of which has 
at its point 3 bristles similar in appearance to 
those on the front ramus. The 3rd pair of limbs 
(Mp), the so-called mandibular legs, of which no 
trace is to be found in the adult animal, issue from 
about the middle of the body, at the dividing line 
between the head and the trunk, and, like the 
second pair, extend one to each side, though gene- 
rally bent rather more backwards. They each issue 
from a somewhat thickened, nodiformly projecting 
base, which represents the still undeveloped body 
of the mandibles. Each mandibular leg consists of 
_ 8 indistinctly defined joints, of which the Ist is the 
largest, and is furnished, on the hind margin, with 
