42 
Vecl Basis af dette ligesom de 3 folgende Fodpar er 
fffistet 2 vel udviklede Gjeller, og foran dem danner Rod- 
leddet et knudeformigt, mod et Bundt af lange, bugtede 
B 0 rster besat Fremspring. 
2det Fodpar (Fig. 19) er af samme St0rrelse og Byg- 
ning som lste Par og skiller sig kun ved et noget af agende 
Laengdeforhold mellem 3die og 4de Led samt derved, at 
Saxenes Fingre er noget laengere. 
3die Fodpar (Fig. 20) er af meget spinkel Bygning 
og staerkt forlaenget, omtrent af hele Forkroppens Laiogde. 
3die Led er lidt kortere end 4de og begge langs sin indre 
Kant bevaebnede med en enkelt Rad af spidse Torner for- 
uden fine Borstcr. Sidste Led er staerkt forlaenget og tyndt, 
noget afsmalnende mod Enden og forsynet med spredte 
Bprsteknipper. Endekloen er omtrent balvt saa lang, lefor- 
mig sammentrykt og langs sin indre Kant besat med fine 
Torner. Svpmmegrenen er fuldkommen af samme Udseende 
som paa de 2 foregaaende Par, og fieller ikke det knude- 
formige bqrstebaerende Fremspring ved Basis mangier. 
4de Fodpar skiller sig i ingen Henseende fra fore- 
gaaende Par. 
Derimod viser sidste Fodpar (Fig. 21) tydeligt ud- 
praegede Afvigelser. Det er omtrent af samme Lsengde 
som de 2 foregaaende Par, men mindre staerkt afsmalnende 
mod Enden og viser et noget forskjelligt Laengdeforhold af 
de enkelte Led. 3die Led er saaledes her adskilligt laengere 
end 4de, og mangier ganske Torner, hvoriinod ■ Bprsterne i 
den indre Kant er bengere og talrigere. Ogsaa 5te Led 
er forholdsvis storre end paa de foregaaende Par og neppe 
kortere end 4de. Endelig er sidste Led af fuldkommen 
lineaer Form, overalt af ens Brede og i begge Kanter, men 
navnlig i den indre tact, besat med korte, kostformige Borste- 
knipper. Endekloen er ganske rudimentaer, afstumpet i 
Spidsen og oftest ganske skjult mellem de fra foregaaende 
Led udgaaende Borstcr. 
Gjellerne (se Fig. 22) viser den saedvanlige pyramidale 
Form og bladede Bygning, men udmserker sig ved sit be- 
tydelige Antal. Man teller paa hver Side 10 saadanne, 
medregnet den ovenfor omtalte supplementere Gjelle paa 
sidste Par Kjaevefodder. Naar undtages denne sidste og 
den allerbageste (se Fig. 21), som begge er uparrede, er 
de ovrige ordnede i en dobbelt Raelcke, saaledes, at til hver 
Fod svarer 2 Gjeller (se Fig. 17 og 19). 
Bagkroppens Svpmmevedhaeng (Fig. 23 og 24) er 
kraftigt udviklede og bestaar af en tykkere, muskulps og 
noget fiadtrykt Basaldol og 2 med talrige cilierede Rand- 
borster besatte, smalt lancetformige Grene eller Endeplader. 
Af disse sidste er den indre noget kortere end den ydre 
og ved Roden i den indre Kant forsynet med et forholdsvist 
temmelig stort cylindriskt eller noget kolleformigt Appendix 
(se Fig. 24). lste Par skiller sig dog i denne Henseende 
At the base of this pair of legs, as also of the three 
succeeding pairs, are attached 2 well-developed branchiae, 
and, anterior to the latter, the basal joint forms a tuberculi- 
form projection, furnished with a bunch of long, curving 
bristles. 
The 2nd pair of legs (fig. 19) are similar in size 
and structure to the 1st, being distinguished from them 
merely by a somewhat different proportion in length between 
the 3rd and 4th joints, as also by the fingers of the chela 
being a trifle longer. 
The 3rd pair of legs (fig. 20) are very feeble in struc- 
ture, and greatly produced, their length about equalling that 
of the whole anterior division of the body. The 3rd joint is 
a trifle shorter than the 4th, and both exhibit along the 
inner margin a single series of sharp-pointed spines, ex- 
clusive of slender bristles. The last joint is greatly pro- 
duced, and slender, tapering a. little toward the extremity, 
and provided with scattered fascicles of bristles. The 
terminal claw is about half as long, falciform, and beset 
along the inner margin with delicate spines. The natatory 
branch has precisely the same appearance as that on the 
two preceding pairs, and not even is the bristle-beset, 
tuberculiform projection at the base wanting. 
The 4th pair of legs are in no respect distinguished 
from the preceding pairs. 
On the other hand, the last pair of legs (fig. 21) ex- 
hibit distinct deviations. They are about of the same length 
as the two preceding pairs, but taper less abruptly toward 
the end, as also the proportion in length between the 
different joints is somewhat different. Thus, the 3rd joint 
is considerably longer than the 4th, and entirely without 
spines, whereas the bristles on the inner margin are longer 
and more numerous. The 5th joint, too, is comparatively 
larger than in the preceding pair, and very little, if at all. 
shorter than the 4th. Finally, the last joint is perfectly 
linear in form, everywhere of the same breadth, and along 
both margins, but especially the inner, beset with short, 
scopiform fascicles of bristles. The terminal claw is quite 
rudimentary, obtuse at the end, and. as a general rule, 
entirely concealed among the bristles of the preceding 
joints. 
The branchiae (see fig. 22) exhibit the usual pyramid- 
ical form and lamellar structure, but are characterized by 
their considerable number. On either side occur 10, in- 
cluding the supplementary branchia mentioned above as 
found on the last pair of maxillipeds. If we except this 
and the hindmost branchia (see fig. 21), both of which are 
odd ones, the rest occur in a double series, so that each 
leg has 2 branchiae (see figs. 17 and 19). 
The natatory appendages of the abdomen (figs 23, 24) 
are powerfully developed, and consist of a thickish, muscular, 
and somewhat flattened basal part, along with 2 slender, lan- 
ceolate branches, or terminal plates, beset with numerous 
ciliated marginal bristles. Of these branches, the inner is some- 
what shorter than the outer, and at the base furnished on the 
inner margin with a comparatively large, cylindric, or some- 
what claviform, appendix (see fig. 24). The 1st pair are 
