OE ————————<«—— — = 
De 2 folgende (9de og 10de) Par (se Fig. 3) 
mangler, ligesom det 8de, ganske Epipodit, og ud- 
meerker sig desuden ved det eiendommelige Udseende 
af Exopoditens dorsale Lap. Denne er nemlig paa 
begge disse Par omformet til en cylindrisk Streng, 
der er hageformigt omboiet i Enden og her forsynet 
med en tet Ciliering. Det er aabenbart, at disse 
4 Appendices (se ogsaa Tab. XTX, Fig. 1, Fig. 9, fb) 
er bestemt til, i Forening med de ovenfor omtalte, 
fra Rygsiden af de 2 bagerste Truncus-Segmenter 
udgaaende, bladformige Plader (1), at stotte de 2 
kageformige Aigmasser, der beres under Skallens 
bagre Del. 
De 2 sidste Fodpar (Tab. XX, Fig. 4, 5) er meget 
smaa, navnlig det bagerste (12te) Par, og mangler 
baade Epipodit og den dorsale Lap af Exopoditen., 
Forovrigt ligner de i Structur de 2 foregaaende Par, 
og har, som disse, alle Enditer, ligesom ogsaa Coxal- 
lappen, tydeligt udviklede, skjondt meget tet sam- 
mentrengte. Den ventrale Lap af Exopoditen er 
paa sidste Par (Fig. 5) reduceret til et fra den ydre 
Side af Endopoditen udgaaende meget lidet, med 5 
Borster forsynet Appendix. 
Beskrivelse af Hannen. 
Hannerne er gjennemgaaende noget mindre end 
Hunnerne, idet Skallen neppe opnaar en Lengde af 
4 mm. Den er ogsaa (se Tab. XVIII, Fig. 3) noget 
mere uregelmessig af Form, med Forenden mere 
tvert afkuttet, og de nedre Kanter dannende fortil 
en meget sterk, nesten vinkelformig Krumning. 
Forovrigt ligner Skallen samme hos Hunnen og er 
fuldkommen ligesaa sterkt buget som hos denne. 
Det i Skallen indesluttede Dyr (se Tab. XX, 
Fig. 6) viser flere characteristiske Eiendommelig- 
heder, hvorved det strax skiller sig fra samme hos 
Hunnen. Hovedet er saaledes betydelig kortere og 
Rostrum af en meget afvigende Form. Seet fra 
Siden (se Tab. X VIL, Fig. 3, Tab. XX, Fig. 6) er 
det neesten jevnt bredt og har Enden, ikke som hos 
Hunnen udtrukket til en skarp Spids, men stumpt 
afrundet. Forfra seet (Tab. XVIII, Fig. 5) viser det 
sig tvert afkuttet i Enden, idet den mediane Spids 
ganske mangler, medens de laterale Fortsatser, hvori 
Hovedets Sidekjole gaar ud, er betydelig mere ud- 
staaende end hos Hunnen og nesten retvinklede. 
Af de eiendommelige trefligede Blade, der hos Hun- 
nen udgaar fra Rygsiden af Truncus bagtil, er der 
intetsomhelst Spor at opdage (se Tab. XX, Fig. 6). 
Haledelen (Fig. 10) har ogsaa en noget forskjel- 
lig Form, idet de 2 Endeflige er betydelig sterkere 
forlengede end hos Hunnen og tettere cilierede. 
The 2 succeeding (9th and 10th) pairs (see fig. 3) 
are, like the 8th, marked by a total absence of an 
epipodite, and are also distinguished by the peculiar 
appearance of the dorsal lobe of the exopodite. In 
both these pairs, this lobe is converted into a 
eylindrical cord, which is bent down at the end like 
a hook, and thickly ciliated. It is evident that 
these 4 appendages (see also Pl. XIX, fig. 1, fig. 9, fb) 
are intended, in conjunction with the above-men- 
tioned leaf-like lamelle (1) issuing from the dorsal 
side of the 2 hindmost segments of the trunk, to 
support the 2 cake-like masses of eggs, which are 
borne beneath the posterior part of the shell. 
The last 2 pairs of legs (Pl. XX, figs. 4, 5) are 
very small, especially the hindmost (12th) pair, and 
are without both epipodite and dorsal lobe of the 
exopodite. In other respects they resemble the 2 
preceding pairs in structure, and have, like them, 
all the endites, as well as the coxal lobe, distinctly 
developed, although very closely crowded together. 
The ventral lobe of the exopodite in the last pair 
(fig. 5) is reduced (to a very small appendage pro- 
jecting from the outer side of the endopodite, and 
furnished with 5 bristles. 
Description of the Male. 
The males, on an average, are rather smaller 
than the females, as the shell scarcely attains a 
length of 4 mm. It is also (see Pl. XVIII, fig. 3) 
rather more irregular in shape, with the anterior 
end more abruptly truncated, and the lower edges 
forming in front a very sharp, almost angular curve. 
In other respects the shell resembles that of the 
female, and is quite as much vaulted. 
The animal enclosed in the shell (see Pl. XX, 
fig. 6) exhibits several characteristic peculiarities, 
thereby being immediately distinguished from the 
female. The head is considerably shorter, and the 
rostrum of a very different shape. Seen from the 
side (see Pl. XVIII, fig. 3; Pl. XX, fig. 6), if is of 
almost even breadth, the end not. being drawn out, 
as in the female, to a sharp point, but being bluntly 
rounded, Seen from the front (Pl. XVIII, fig. 5), 
it appears abruptly truncated at the end, the median 
point being altogether absent, while the lateral pro- 
jections into which the side keels of the head are 
produced are considerably more prominent than in 
the female, and almost rectangular. There is no 
trace whatever to be discovered of the peculiar tri- 
lobed lamelle, which, in the female, issue from the 
dorsal surface of the trunk behind (see Pl. XX, 
fig. 6). 
The caudal part (fig. 10) is also of a somewhat 
different shape, the 2 terminal lobes being consider- 
ably more elongated than in the female, and more 
thickly ciliated. 
