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20
formist udskaaret Rodled er forbundet med Skaftet, er
næsten overalt jevn tyk og bestaar af circa 20 korte,, med
tætte Knipper af gjennemsigtige, baandformige Sandseborster
i ile saakaldte cilia auditoria) besatte Led. Den indre Svobe
er betydelig tyndere, afsmalnende mod Enden og
sammensat af et lignende Antal, men med simple Borster besatte
Led. Hos Hannerne er begge Svøber længere og navnlig
den ydre (Fig. 5) betydelig stærkere udviklet og bestaaende
af flere Led.
2det Par Folere, der næsten er fæstede i samme
horizon tale Plau som 1ste Par. bestaar (se Fig. 61 af en
kort og tyk. utydelig segmenteret Roddel. fra hvis Ende
udgaar oventil og udad et bladformigt Vedhæng, nedentil
og indad en tynd, mangeleddet Svøbe, Roddelen gaar paa
den ydre Side ud i en stærk tornformig, fortilrettet
Fort-sats og viser ved Basis paa den indre Side en spids Torn,
der synes at svare til Lugteknuden hos Brachyurerne og
den saakaldte spina olfactoria hos Amphipoderne.
Det bloddannede Weähæng (Hid.) er af en meget bred,
oval eller elliptisk Form og neppe mere end dobbelt saa
langt som bredt. Dets ydre Kant er næsten lige, eller kun
ganske svagt buet og glat samt ender fortil med et stærkt
tandformigt Fremspring. Den indre Kant er jevnt
bue-formigt bøiet og ligesom den bredt afrundede Ende af
Bladet forsynet med en tæt Bad af korte Fjærbørster.
Den øvre Flade viser 8 divergerende Kjoler, hvoraf den
ydre lober i nogen Afstand fra Randen lige fortil mod det
omtalte tandformige Fremspring, medens de 2 øvrige
passerer i diagonal Retniug over Bladet og taber sig henimod
dettes borstebesatte Rand.
Svoben bestaar af et cylindriskt Skaft omtrent af
Bladets Længde og en traadformig Endedel. Skaftet ise
Fig. 6) er sammensat af o Led, hvoraf de 2 förste er
ganske korte og skjævt forbundne med hinanden, medens
sidste Led er af anselig Længde, regelmæssigt cylindriskt
og ved Enden børstebesat. Den traadformige Endedel (se
Fig. 1 og 2) er omtrent af Legemets halve Længde og
sammensat af talrige korte Led.
Munddelene er idethele temmelig svagt udviklede og
viser den for Crangoniderne characteristiske Bygning.
Overlæben (Fig. 7) danner ell temmelig voluminøs
halvkngleformig Frenistaaenhed. der delvis dækker
Mund-aabniugen fortil.
Underlæben (Fig. 8) er af en særdeles tynd,
luem-branos Beskaffenhed og derfor vanskelig at faa helt
udpræpareret. Den gaar ud i to meget stærkt divergerende
Lapper, der ender med en noget iudadkrummet Spids, men
forøvrigt ganske synes at mangle enhver Ciliering i Kanterne.
Kindbakkerne (Fig. 9), der som hos alle egentlige
Crangonider magier Palpe, er forholdsvis smaa og svage.
short and thick, almost bowl-shaped basal articulation, is
of nearly uniform thickness throughout, and consists of about
20 short joints, beset with closely disposed fascicles of
translucent, riband-shaped sensory bristles (the so-called
cilia auditoria). The inner flagellum is much more slender,
tapering towards the extremity, and composed of a like
number of articulations, beset however with simple bristles.
In the males, both tiagella are longer, and, in particular the
outer one (fig. 5). much more developed and composed of
a greater number of articulations.
The 2nd pair ol’ antennæ, attached almost in the same
horizontal plane as the 1st pair, consist (see fig. 6) of a
short and thick, indistinctly segmented basal portion, from
the extremity of which, upward and outward, proceeds a
squamiform appendage, downward and inward a slender
multi-articulate flagellum. The basal portion is produced on the
outer side into a stout, spiniform, anteriorly directed process,
and exhibits at the base, on the inner side, an acute spine,
corresponding apparently to the olfactory tubercle in the
Brachyura and the so-called spina olfactoria in the
Ain-phipoda.
The squamiform appendage (ibid.) is exceedingly broad,
oval or elliptic in form, and very little more than twice
as long as broad. Its outer margin is almost straight, or
very slightly curved, and smooth, terminating anteriorly in
a stout, dentiform projection. The inner margin is
uniformly arcuate, and. in common with the broadly rounded
extremity of the scale, furnished with a closely set series
of short, plumose bristles. The upper surface exhibits 3
diverging carinæ, the outer ol’ which extends, at some
distance from the margin, straight forward towards the
previously mentioned dentiform projection, whereas the 2 others
pass diagonally across the scale, and disappear in immediate
proximity to the bristly margin of the latter.
The flagellum consists of a cylindric peduncle, about of
the same length as that of the scale, and of a filiform
terminal portion. The peduncle (see fig. G) is composed
of 3 segments, the 2 first quite short and obliquely
connected with each other, whereas the last segment is of
considerable length, of a regular cylindrical form, and at the
extremity beset with bristles. The filiform terminal portion
(see figs 1. 2) about equals half the body iu length, and is
composed of numerous short articulations.
The buccal parts are on the whole but slightly
developed, and exhibit the structure characteristic of the
Crangonidæ.
The labrum (fig. 7) constitutes a comparatively
voluminous semiglobular prominence, partially covering the buccal
orifice in front.
The labium (fig. 8) has an exceedingly tliin,
membranaceous structure; and hence can with great difficulty
be separated in a complete state. It protends as two
exceedingly diverging lobules, terminating in a somewhat
inwardly curved point, but for the rest would appear to be
entirely without any ciliated covering at the edges.
The mandibles (fig. 9), which, as in all true
Crangonidæ, are without any palps, are comparatively small and
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