22 
der danner den egentlige Stamrae og er fremkommen ved jj 
en Sammensmeltning af Endognatb og Mesognath, gaar ud j 
i en smalt tungeformig. i den indre Kant borstebesat Lap. 
uden nogen tydelig Leddeling, Den midterste Gren (Exog- 
nath), der aabenbart svarer til den membranose Plade paa 
2det Par Kjsever. er betydelig storre og ligesom den indre 
fortilrettet, saint bestaar a.f en noget pladeformig, i den 
ydre Kant taet borstebesat Basaldel og en ganske tynd, 
indadkrummet og sfeerkt bugtet Endesnsert, livis ydre Parti 
er delt i korte med Fjserbprster besatte Led. Den ydre 
Gren endelig (den saakaldte Epignath) bar Eormen af en 
temmelig stor budagtig, i to koniske Eliger — en fortil og 
en bagtilrettet — udgaaende b0rstel0s Plade. 
2det Par Kjsevefodder (Fig. 1 4) viser de samme Hoved- 
dele som foregaaende Par. skjondt temmelig modificeredc i 
sit Udseende. Navnlig er den indre Gren her betydelig 
stserkere ndviklet, dannende en paa Midten yinkelformigt 
boiet og indadkrummet Stamme, der er afdelt i 6 tydelige 
Led. Af disse er det nsestsidste st0rst og ligesom opsvulmet 
paa Midten saint langs den ydre Kant forsynet med talrige 
lange og stive Bprster. Sidste Led, der ved en ineget skjsev 
Sutur er begramdset fra foregaaende, er ganske kort og 
bevaebnet med flere ulige store Tomer, hvoraf 3 udmuerker 
sig ved betydelig Laengde. Exognatben, der er fsestet til 
Ydersiden afStammens 2detLed, bestaar ligesom paa fore- 
gaaende Par af en noget sammentrykt Basaldel, der er 
bredest ved Roden og her i den ydre Kant besat med 
lange boiede Fjserborster, samt en tynd Endesnsert, der er 
rettet indad og mindre bugtet end paa 1 sto Par. Epignatben 
er ogsaa her tilstede, men er betydelig mindre end paa 
foregaaende Par og mangier, ganske den fortilrettede Lap. ji 
3 die Par Kjsevefodder (Fig. 15) skiller sig vsesentlig 
fra de pvrige Munddele ved sin betydelige Storrelse og fod- 
formige Bygning. De opnaar mestcn hele Rygskjoldets 
Lamgde og rager fortil adskilligt ud over 2det Par Foleres 
Blad. Tilsyneladende bestaar disse Kjsevelpdders Stamme 
kun af 4 Segmenter, et kort og tykt Rodled, et meget 
langstrakt og noget bugtet 2det Led, et neppc lialvt saa 
stort 3die Led og et stserkt affladet. mestcn spa deform igt 
Endeled. Yed noiere Undersogelse finder man dog, at 
Rodleddet egentlig er sammensat af 2 ufuldstsendigt begrsend- 
sede Segmenter, hvoraf det 2det paa sin Yderside gaar ud 
i en kort, tungeformig Flig, der imkllertid neppe, som 
Krpyer mener, svarer til Epignatben paa de 2 foregaaende 
Par. Fremdeles er der en vistnok svag Antydning til en 
Sondring paa nseste Led af et kort Basalafsnit, fra hvis 
Yderside den i Bygning og Storrelse med samme paa fore- 
gaaende Par noie overensstemmende Exognatb udgaar. Ende- 
lig bemserkes red stark Forstorrelse og Compression i Spid- 
sen af sidste Segment et yderst lidet, men tydeligt afsat 
Endeled. Leddenes Antal bliver saaledes egentlig 7, sva- 
brancb, which constitutes the actual trunk, and results from 
a coalescence of the endognatb and the mesognath. protends 
as a slender, hnguiform lobule, beset along the inner margin 
with bristles, and does not exhibit any distinct articulation. 
The. middle branch (exognatb), which obviously corresponds 
to the membranous plate on the 2nd pair of maxilla?, is 
considerably larger, and, like the innermost, directed an- 
teriorly, consisting, too, of a somewhat lamellar basal portion, 
densely beset with bristles along the outer margin, and a 
delicate, inwardly curving and exceedingly sinuous terminal 
lash, the outer part of which is divided into short articula- 
i tions, beset with plumose bristles. Finally, the outermost 
branch (the so-called epignath), cutaneous in substance and 
without bristles, lias the form of a comparatively large 
plate, protending into two conical lobes — one directed 
anteriorly and one posteriorly. 
The 2nd pair of maxillipeds (fig. 14) exhibit the same 
principal parts as the foregoing pair, though of consider- 
ably modified appearance. The innermost branch, in parti- 
cular, is much more developed, constituting a geniculate 
stem, curving inward, and divided into 6 distinct articula- 
tions. Of these articulations, the penultimate is the largest, 
and, as it were, tumified in the middle, and furnished along 
the outer margin with numerous long and stiff bristles. 
The last articulation, which, by an exceedingly oblique 
suture, is separated from that preceding it. is very short 
and armed with several large spines, varying in length, 3 
of which, however, are remarkably long. The exognatb, 
attached to the outer margin of the 2nd articulation of the 
stem, consists, as does that on the preceding pair, of a 
somewhat compressed basal portion, broadest at the root, 
and beset along the outer margin with long, curving plu- 
mose bristles, having also a slender terminal lash, directed 
inwards, and less sinuous than that on the 1st pair. The 
epignath is also present, though much smaller than that on 
the preceding pair, the anteriorly directed lobe being 
entirely wanting. 
The 3rd pair of maxillipeds (fig. 15) are chiefly distin- 
guished from the other buccal appendages by their considerable 
size and pediform structure. They attain almost the entire 
length of the carapax, and, in front, project considerably 
beyond the scale of the 2nd pair of antennae. Apparently, 
the stem of these maxillipeds consists of only 4 segments, 
— a short and thick basal articulation, an exceedingly 
elongate and very sinuous 2nd articulation, a 3rd articula- 
tion, scarcely half as large, and an extremely flattened, almost 
spatula te, terminal articulation. On closer examination, 
however, the basal articulation is found to be composed 
of 2 imperfectly separated segments, of which the 2nd 
sends off from its outer margin a short, linguiform lappet, 
that hardly, however, as assumed by Kroyer, can corre- 
spond to the epignath on the 2 preceding pairs. Moreover, 
on the next articulation there is a trace, faint indeed, 
of a, basal section, from the outer margin of which 
proceeds the exognatb. precisely similar in size and struc- 
ture to that on the preceding pair. Finally, when ex- 
amined under a powerful magnifier and highly compressed, 
