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114
Underlæben (Fig. 8) har Endeloberne tint cilierede
saavel i den ydre som indre Kant.
Kindbakkerne (Fig. 9) er meget kraftigt byggede og
har de fra den forreste Del af Endepartiet udgaaende
tandede Fortsatser forholdsvis stærkere udviklede end hos
Aretnrus samt al’ en mork brunsort Farve. De imellem disse
og Tyggeknuden fæstede secundære Plader er ligeledes noget
forskjelligt formede, som vil sees ved en Sammenligning af
de respective Figurer.
Do 2 Par Kjæver (Fig. 10 og 11) er næsten nøiagtigt
af samme Udseende som hos Arcturus.
Kjævefodderne (Fig. 12) har Palpens Led forholdsvis
bredere og mere pladedannede. Epignathen er af en
lignende Form som hos Arcturus, men har hele den ydre
Kant fint eilieret. Basalpladen er noget mindre og smalere
samt uden Borster.
Af Fødderne er de 3 forreste Par ægte Griberedskaber
og derfor i Regelen (se Fig. 2) slaaede ind under
Forkroppen, saa at de, naar Dyret sees ovenfra (Fig. 1),
ial-mindelighed er ganske skjulte. De er alle af fuldkommen
ens Udseende og særdeles kraftigt byggede. Af Leddene
er (se Fig. 13 og 14) 3die og 4de meget korte og af
temmelig uregelmæssig Form samt forbundne med hinanden paa
en eiendommelig Maade, idet hint ligesom omfatter dette.
5te Led er stort og bredt, af oval Fonn og danner i
Forbindelse med den kraftige Endeklo (Dactylus) en Slags
Gribehaand.
De 4 bagerste Fodpar er ægte Gangfodder og rager
derfor under Dyrets Bevægelser mere ud til Siderne (se
Fig. 1 og 2). De tiltager successivt i Længde bagtil og
bestaar (se Fig. 15 og 16) ligesom de forreste Par af 5
Led foruden Endekloen; men alle Led er her simple og
det sidste ikke udviklet til nogen Gribehaand. Alle disse
Fodpar er temmelig rigeligt borstebesatte i Kanterne.
Brystposen var hos et Par af de indsamlede
Exemplarer fuldt udviklet og indeholdt talrige grønagtigt farvede
Æg. Den sammensættes som hos de øvrige til denne
Familie hørende Former af 4 Par brede og gjennemsigtige
Plader, der udspringer fra Basis af 2det—5te Fodpar.
Bagkropslemmerne er (se Fig. 2) som hos foregaaende
Familie nedad dækkede af et Par voluminøse klapformige
Organer, der forestiller de modificerede Halevedhæng. Fjernes
disse, bemærkes (se Fig. 17) 5 vel udviklede Buglemmer,
der mere eller mindre fuldstændigt dækker hinanden
indbyrdes.
De 2 förste Par (Fig. 19 og 20) er ligesom hos
Arcturus udviklede til Sømmeredskaber, men skiller sig ved
betydelig kortere Roddel og bredere, ovale Endeplader,
hvoraf den indre er kjendelig større end den ydre. Begge
Plader er i Kanterne forsynede med talrige cilierede
Borster, men som er forholdsvis betydelig kortere end hos
Arcturus.
The labium (fig. 8) has the terminal lobes finely
ciliated, both along the outer and the inner edge.
The mandibles (fig. 9) are very powerful in structure,
and the dentate projections jutting forth from the anterior
part of the terminal region, relatively stronger than in
Arcturus, as also of a dark brownish-black colour. The
secondary plates, too, attached between the said projections
and the molar protuberance, have likewise a somewhat
deviating form, as will appear on comparing the respective
figures.
The 2 pairs of maxillæ (figs. 10, 11) have almost
exactly the same appearance as in Arcturus.
The maxillipeds (fig. 12) have the joints of the palp
comparatively broader and more lamelliform. The epignath
exhibits a similar form to that in Arcturus, but has the
whole of the outer margin finely ciliated. The basal plate
is somewhat smaller and narrower, as also without bristles.
Of the legs, the 3 anterior pairs are true organs of
prey, and hence, as a rule (see fig. 2), bent in under the
body, so that, when the animal is viewed from above
(fig. 1), they are generally quite concealed. They all
present a perfectly uniform appearance, and are exceedingly
powerful in structure. Of the joints (see figs. 13, 14),
the 3rd and 4th are very short and somewhat irregular in
form, as also connected together in a peculiar manner, the
former encompassing, as it were, the latter. The 5th joint
is large and broad, oval in form, and constitutes, in
conjunction with the terminal claw (dactylus), a kind of
prehensile hand.
The 4 posterior pairs of legs are true pereiopoda,
and hence, during the movements of the animal, project
somewhat farther out toward the sides (see figs. 1, 2). They
increase successively in length posteriorly, and consist (see
figs. 15, 16), as is the case with the anterior pairs, of 5
joints, exclusive of the terminal claw; but all these joints
are simple, nor is the last developed to a prehensile hand.
These pairs of legs are all of them rather abundantly
furnished with bristles along the edges.
The marsupium, in one or two of the specimens taken,
was fully developed, containing numerous greenish coloured
eggs. It is composed, as in the other forms belonging to
this family, of 4 pairs of broad and translucent plates,
springing from the base of the 2nd up to the 5th pair of legs.
The abdominal limbs (see fig. 2) are, as in the
preceding family, covered below by a pair of voluminous
valvular organs, representing the modified caudal appendages.
On removing these organs, are observed (see fig. 17) 5
pairs of well developed ventral appendages, the one covering
more or less completely the other.
The 2 first pairs (figs. 19, 20) are, as in Arcturus,
developed to natatory organs, but differ in the basal part
being considerably shorter, as also in their having broader
ovate terminal plates, of which the inner is appreciably
larger than the outer. Both plates are furnished along the
edges with numerous ciliated bristles, which, however, are
relatively much shorter than in Arcturus.
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