101 
d sidste Led bemserkgs ved inhere lJnders 0 gelse en liden 
g* ^'^i'uininet Klo, dor egentlig reprsesenterer et sterskilt 
De 3 bagerste Fodpar (Fig. Hi) vise)' et belt for- 
. F'lligt l.dseende og forestiller de egeutlige Gran gladder, 
n °nued Dvret klamrer sig Inst til lorskjeilige Gjenstande 
^ aa ^ av bunden. I Overensstemmelse mod denne deres Be- 
Henamelse har de ogsaa en fra de forreste Par forskjellig 
1 tning. idet de er vendte nedad og noget bagud. med en 
Oa ik knaeformig Boining mellem Basalleddet og den avrige 
1 er af temmelig kraftig Bygning, mod noget knudret 
' ev dade og sparsom Haarbessetning, samt aftager successivt 
lifide bagtil, idet Basalleddet burtigt lbrmindskes i Stor- 
1 Sl • i let tenunelig smale cvlindriske Endeled gaar ved 
ladsen ud i en skarp triaugubcv Fortsats og bserer desuden 
1 ba Leddet tydeligt at'sat kort, men stair k Klo. Hele 
' de ^ med sin Endeklo forestiller den saakaldte Dactyl us, 
°m her synes at vsere tveklaftet i Enden. 
1 nder Midten af Forkroppen bemserkes (se Fig. 2) 
p' U saa kaldte Brystpose eller Marsupium, der dannes at 3 
' u tydelige, i Midten over hinanden gribende Plader. ud- 
’- ,l a(ude tra 2det, 3die og 4de trie Segment. 
j Bagkroppens Lemmer er indbyrdes meget lorskjeilige 
/ <l _ l ’ Function og Bygning. Der Andes ialt 6 Par, livoral 
0 forreste ialmindeligbed fuldstaendig dfekkes af det eien- 
•nnueligt modibcerede sidste Par (se Fig. IS). 
j, k>e - iorste Par (Fig. 10), der udgaar fra de 2 Irie 
^ l ° kl opssegmenter, er aabenbart uddannede til et Slags 
^ 0llllu eredskaber og maa falgelig efter Dvrets Vilie kunne 
^ i mkkes frean af den Oavitet, bvori de i Regelen er inde- 
ft' dr 1 sanunen med de 3 folgende Par. De bestaar al 
W SUlal adeddet Stain me, til bvis Ende er heestet 2 lige- 
Tl <S 81Ua ^° J luen med lauge Fjaerbarster besatte Plader. 
. odersiden af Stammens ydre Led er bestet eu Bad af 
p 1K *" llu "eligo hageformige Tomer, hvorved ethvert al disse 
1 ligesom limgtes sammen. saa at deres Bevsegelser kun 
an sk « samtidigt. 
i k d f 0 f§ ent f e Par (Fig. 20), der altid ligger skjult 
p un< fnn af den al Endesegmentet oventil begrsendsede 
^ ' 'fi't. bar Stammen ganske kort og kun bestaaende at 
St/ nl elt hvoi'imoil Emlepladerne er af meget betydelig 
St a ^ a,n "f elliptiske og af en eiendommelig spongios 
0 U ^ Ul ’ der tydelig nok stempler dem som Respirations- 
H i? 111 , 1 ' ^ aar undtages 2 korte Fjrerbprster i Yderkanten 
1 ^pidsen af den ydre Plade, er de ganske borstelose. 
lue „ Par Bagkropslemmer, der svarer til Haleved- 
jjv. |' n , 10 kos andre Isopoder er (se Fig. 18) i Lighed med 
m l!' . ^ dbeldet er hos Idotbeerne omformede til et Par 
hv u dviklede og staerkt cliitiniserede Plader, der fra 
C1 ’ Slde hvmlver sig ud over de ovrige Bagkropslemmer, 
11 hidtagende hele Bagkroppens Underside og modende 
’‘don i Midtlinien. De er bevaigeligt feestede til liver 
longed: but at tbe point of tlie last joint may be detected 
on closer examination a small, incurving claw, which, strictly, 
represents a separate terminal joint. 
The 3 posterior pairs of legs (bg. 16) exhibit a widely 
different appearance, representing the true pereiopoda, by means 
of which the animal is enabled to grip bold of the various objects 
it encounters in its path over tbe sea-bed. In accordance with 
the function of these organs, they have, too, a direction different 
from that given the preceding pairs, being turned down- 
ward and somewhat backward, forming a strong, geniculate 
flexion between the basal and the remaining part. They are 
comparatively powerful in structure, with a somewhat rugged 
surface and thinnish covering of hair, and diminish succes- 
sively in length posteriorly, tbe basal joint exhibiting a 
rapid decrease in size. The somewhat slender, cylindric 
terminal joint juts out at tbe extremity into an acute, tri- 
angular projection, and bears too a short but strong claw, 
distinctly debned from tbe joint. Tbe whole joint, along 
with its terminal claw, represents tbe so-called dactylus. 
which, here, is apparently bifurcate at tbe extremity. 
Beneath tbe middle of tbe anterior division of tbe body is 
seen (bg. 2) tbe so-termed incubatory pouch, or marsupium, 
composed of 3 pairs of distinct plates, overlapping in tbe 
middle, that proceed from the 2nd, 3rd. and 4th free seg- 
ments. 
The abdominal limbs are relatively very different, alike 
in function and structure. In all, the number of pairs is 
6. of which tbe 5 anterior, as a rule, are completely covered 
by tbe peculiarly modified terminal pair (see bg. 18). 
The 2 brst pairs (bg. 1 9), proceeding from the 2 free 
abdominal segments, are manifestly adapted as a kind ol 
natatory organs, and hence must, at tbe will of the animal, 
admit of being stretched forth from tbe cavity, ih which 
as a rule they are enclosed, along with tbe 3 succeeding 
pairs. They consist of a slender, two-jointed stem, to the 
extremity of which are attached 2 narrow plates, beset with 
lone, plumose bristles. To the inner side of tbe outer joint 
of/Mhe stem, is attached a series of peculiar, unguiform 
spines, by means of which each of these pairs are. as it 
were, hooked together; and hence their movements must of 
necessity be simultaneous. 
Tbe 3 succeeding pairs (bg. 20), which at all times 
lie concealed at the bottom of the cavity bounded above by 
the terminal segment, have tbe stem quite short and 
consisting but of one joint, whereas the terminal plates are 
of very considerable size, oblongo-elliptic, and exhibiting a 
peculiar, spongy structure, which obviously marks them as 
respiratory organs. With the exception of 2 short, plumose 
bristles on the outer edge, near the point of the outer 
plate, they are entirely devoid of bristles. 
The last pair of abdominal limbs, corresponding to 
the caudal appendages in other Isopods, are (see bg. 18), 
as in the Idotheidas, transformed into a pair of largely 
developed and strongly chitiuized plates, which, on either side, 
arch out over the other limbs, occupying almost the whole 
under surface of the abdomen, and meeting each other along 
the medial line. They are movably attached to" either side 
