Beskrivelse af Hunnen. 
Lengden af de storste af mig undersogte Ex- 
emplarer er, maalt fra Panderanden til Enden af 
E Halepladen, 24 mm. Dog synes det at vere meget 
___ sjeldent, at den naar en saa betydelig Storrelse, og 
18—20 mm. maa ansees for Gjennemsnitsstorrelsen 
for fuldt udviklede Individer. 
Som hos de ovrige til denne Phyllopodegruppe 
-_ horende Former, er (se Tab, XI, Fig. 1) Storste- 
parten af Legemet dekket oventil af et bredt, kun 
svagt hvelvet Rygskjold, hvorved Legemsformen 
faar et noget fladtrykt Udseende. Dette Rygskjold 
er fortil fuldkommen sammenvoxet med Hovedet, 
hvorimod det bagtil kun lost dekker den underlig- 
gende Krop, som frit kan beveeges under samme (se 
Fig. 3). Sees Legemet ovenfra (Fig. 1), viser sig en 
___ storre eller mindre Del af Kroppen at rage frem 
__ bagenfor Rygskjoldet i Form af en jevnt afsmal- 
nende, noget cylindrisk Hale, endende med 2 lange, 
_ divergerende Vedheeng, Haletraadene, mellem hvilke 
_ desuden rager frem en liden median Haleplade. 
Sees Legemet nedenfra (Fig. 2), ligger hele Dyrets 
_ Bugflade med sine forskjellige Vedheng frit for Be- 
_ skueren indenfor Rygskjoldets Concavitet. Helt for- 
til sees en fra Panderanden udgaaende halymaane- 
 formig glat Flade, umiddelbart bag hvilken Folerne 
e og Munddelene har sin Plads. Derpaa folger den 
lange Reekke af Fodder, der viser et temmelig uens- 
artet Udseende. 1ste Par er ialmindelighed lige ud- 
strakt til hver Side, saa at det noget overrager 
Siderandene af Rygskjoldet, medens de derpaa fol- 
gende 10 Par er mere indadkrummede, dog saaledes, 
at der mellem dem i Regelen altid findes et aabent 
Rum, i Bunden af hvyilket Kroppens Bugside sees i 
Form af en smal rendeformig Fordybning, begreend- 
set til Siderne af de respective Fodders indadrettede 
Coxallapper. Lengere bagtil indsnevres dette Rum, 
og Fodderne ligger her tet sammen som Bladene i 
en Bog, aftagende gradvis i Storrelse. Den samlede 
-Fodmasse antager derved Formen af en bagtil ven- 
_ dende spids Kegle. Den bagerste Del af Legemet 
er uden Lemmer og af simpel cylindrisk Form. 
« 
a, 
(3 
_ Rygskjoldet viser, ovenfra seet (Fig. 1), en bredt 
Form, med Sidekanterne jevnt buede og fortil 
de i et med den ligeledes buede Frontalrand 
edet. Bagtil er det noget indsnevret og har 
st, der antyder Mandibularsegmen- 
Nakkefuren liggende Del represen- 
i Midten viser en stumpt afrun- 
-hvilken de 2 sammensatte Gine 
69 
Description of the Female. 
The length of the largest specimen examined 
by me measured 24 mm. from the frontal margin to 
the end of the caudal lamella. It seems, however, 
very seldom that it attains so considerable a size, 
and from 18 to 20 mm. must’ be considered as the 
average size for fully-developed animals. 
As in the other forms belonging to this group 
of Phyllopoda, the greater part of the body (see 
Pl. XI, fig. 1) is covered abcve by a broad, only 
slightly vaulted carapace, whereby the body acquires 
a somewhat flattened appearance. This carapace 
is completely united in front with the head, whereas 
posteriorly it only loosely covers the underlying 
body, which can move freely beneath it (see fig. 3). 
When the animal is viewed from above (fig. 1), more 
or less of the body is seen projecting from behind 
the carapace in the form of an evenly tapering, 
somewhat cylindrical tail, ending in two long, di- 
vergent appendages, the caudal filaments, between 
which there also projects a small median caudal 
lamella. When viewed from below (fig. 2), the whole 
of the animal's ventral surface with its various ap- 
pendages lies exposed to view within the concavity 
of the carapace. Right in front, a crescent-shaped, 
smooth surface is visible, starting from the frontal 
margin, and immediately behind this are situated 
the antenne and the oral parts. Then follows the 
long row of legs which present a somewhat hetero- 
geneous appearance. The first pair is generally 
extended equally to both sides, so that it projects 
a little beyond the lateral edges of the carapace, 
while the following 10 pairs are more bent inwards, 
though in such a way, that, as a rule, there is an 
open space between them, at the bottom of which 
the ventral surface of the body is visible in the 
shape of a narrow groove bounded laterally by the 
inwardly inclined coxal lobes of the respective legs. 
Further back, this space is contracted, and the legs 
lie as close together as leaves in a book, diminishing 
gradually in size. The accumulated mass of legs 
then assumes the form of a posteriorly pointing 
cone. The hindmost part of the body is without 
limbs, and in the form of a simple cylinder. 
The carapace, seen from above (fig. 1), is of a 
broad oval shape with the lateral edges evenly 
curved, and continuous with the likewise curved fron- 
tal margin of the head. It is somewhat narrowed be- 
hind, and has, in the middle, a deep, angular inci- 
sion, the edges of which are armed with small, sharp 
denticles. In the anterior part above, may be seen 
a distinct transversal hollow, the cervical sulcus, 
at the bottom of which there is a rounded trans- 
verse prominence, indicating the mandibular segment. 
The region in front of the cervical furrow repre- 
sents the head, and exhibits, in the centre, a bluntly 
