134 
er saerdeles bevsegeligt forbundne med hiuanden ved en 
ganske tynd Stilk, saa at det sidste kan slaaes ind mod 
det fprste. Endekloen or s air deles liden, stiletformig og 
naesten ganske skjult inellom do fra sidste Led udgaaende 
Fjaorbarster (se Fig. 19). 
Brystposen var hos ingen af do erholdte Exemplarer 
fuldt udviklet ; men do 4 Par Plador, dor bidrager til dennes 
Dannelse, var paa de fieste tydeligt anlagte i Form af smaa 
fra Basis af de 4 forste Fodpar udgaaende Lappor (se Fig. 
2 og 3). 
Bagkroppens Operculum (so Fig. 2 og 3) er saerdeles 
stort og hvselvet, indtagende Starsteparten af Bagkropsseg- 
mentets Underside. Dot riser langs ad Midten en stump 
Kjol. der i den ydre Del spalter sig i 2 divergerondo Grene. 
Kanterne er ganske glatto. 
De under Operculet liggende Buglemmer er alle segte 
respiratoriske og af en saerdeles blad og tander Structur. 
Det lste Par (Fig. 20) er tydelig tvegreuet, med den indre 
Gren dannende on bred afrundet i 2 utydelige Segmenter 
afdelt Plade, den vdre ganske smal. cylindrisk og noget 
krummet saint bestaaende af 2 tydelige i sin ydre Kant fint 
cilierede Led. Do ovrige Par synos kun at da,nne enkle, 
uregolmmssigt foldede Plador (Fig. 21). 
Halevodhsengene (Fig. 22), der trader from til liver 
Side af don stumpe Fremragning, som Bagkropssegmentet 
danner bagtil i Midten. er saerdeles smaa, men tydeligt 
tvegrenede, med don indre Gren omtrent af Basaldelens 
Laengde, den ydre botvdelig mindre. Begge Grene or af 
lineser Form og forsynede med noglo meget smaa og fine 
Burster. 
Hanneme skiller sig ikke i sit vdro meget vaesentligt 
fra Hunnerne, men kjendes dog lot ved lste Par Foleres 
staerkere Udvikling og rod den eiendommelige Bygning af 
Bagkroppens Operculum. 
lste Par Folero (Fig. 23) er kjendeligt lsengerc end 
hos Hunnen, hvilket skyldes den langt staerkere Udvikling 
af Svuben, der er forlioldsvis mere end dobbelt saa lang 
og sammensat af et sterdeles stort Antal af Led. 
Bagkroppens Operkulum (se Fig. 24) er, som hos de 
til foregaaende Familie horonde Former dolt i 4 sairskilte 
Plader, 2 ganske smale i Midton og 2 bredere Sidoplader. 
Do mediane Plader, der ligger i umiddelbar Contact med 
hinanden, er af lineaer Form og ondor liver med 2 tri- 
angulsere Spidser. Sidepladerne or af halvoval Form og 
paa den ydre Side joint hvaelvede. Paa don indre Side 
(se Fig. 25) findes mer Enden et eiendonimeligt krogformet 
Appendix, der ved Roden bagtil visor en lidon afrundet 
Lap. Detto Appendix kan bevaeges ved sierogne Muskier, 
der tydeligt sees at convergore mod Basis af sainnie. At 
vi her har at gjore med Hjaelperedskaber ved Copidationen 
er vol utvivlsomt; dog er dot endiiu ikke med Sikkerhed 
oplyst, hvorledes disse Dole herunder fungerer. 
in size,, has a regular elliptic shape. Both articulations 
are very movable connected by an exceedingly narrow 
stem, which admits of the latter being jerked back toward 
,j the former. The terminal claw is very small, styliform, 
and well-nigh wholly concealed amidst the plumous bristles 
(see fig. 19) issuing from the last articulation. 
The marsupium did not in any of the specimens col- 
lected occur fully developed; but the 4 pairs of plates that 
contribute to its formation were on most however distinctly 
indicated in the form of small lobes, proceeding from the 
base of the 4 first pairs of legs (see figs. 2, 3). 
The operculum of the abdomen (see figs. 2, 3) is ex- 
ceedingly large and arcuate, occupying the greater part of 
the under surface of the abdominal segment. It exhibits 
along the middle an obtuse carina, which, in its outer part, 
divides into 2 diverging branches. The edges are quite smooth. 
The abdominal limbs, placed underneath the operculum, 
are all true respiratory organs, exceedingly soft and deli- 
cate in structure. The 1st pair (fig. 20) are distinctly bi- 
ramous, with the inner branch forming a broad, rounded 
plate, consisting of 2 indistinctly defined segments; the 
outer is quite narrow, cylindric, and somewhat curved, 
composed of 2 distinct articulations, ciliated along the outer 
margin. The remaining pairs would appear to form merely 
simple, irregular- folded plates (fig. 21). 
The caudal appendages (fig. 22), jutting forth on either 
side of the obtuse projection formed in the middle, pos- 
teriorly, by the abdominal segment, are exceedingly small, 
but distinctly biramous, with the inner branch about of the 
same length as the basal part, the outer considerably shorter. 
Both branches are linear in form, and provided with a few 
exceedingly small and delicate bristles. 
The males do not differ essentiably in their outer 
habitus from the females, hut are nevertheless easily rec- 
ognized by the fuller development characterizing the 1st 
pair of antenme, as also by the peculiar structure of the 
abdominal operculum. 
The 1st pair of antenme (fig. 33) are appreciably 
longer than in the female, a character arising from the 
much fuller development of the flagellum, which is rela- 
tively more than double the length, and composed of a 
very large number of articulations. 
The operculum of the abdomen (set' tig. 24) is, as in 
the forms belonging to the preceding family, divided into 
4 separate plates, 2 very narrow' ones in the middle and 
2 broader lateral plates. The median plates, immediately 
contiguous to each other, are of a linear form, and term- 
j mate each in 2 triangular points. The lateral plates are 
semi-oval, and, on the outer side, uniformly arched. On 
the inner side of the latter plates (see fig. 25), occurs 
near the extremity a. peculiar, hook-shaped appendix, which, 
at the base, posteriorly, has a small, rounded lobe. This 
appendix is movable by moans of specially adapted muscles, 
distinctly seen converging toward its base. That we have 
here to do with accessory organs of copulation is, I think, 
unquestionable; though as yet it remains to be shown what 
particular function the said parts perform in the act. 
