i i, ees 
hed som Foddernes Epipoditer. 
er utydeligt tredelt og har i den indre Kant en fin 
Ciliering (Fig. 9). 
Bag Kindbakkerne folger nu t#t sammen de 
ovrige Munddele (se Tab, XII, Fig. 1), som det ikke 
er saa ganske let at isolere, da de delvis er for- 
bundne ved et System af sterke Chitinlister. Imid- 
lertid er det ikke saa vanskeligt at paavise, at de 
danner 3 paa hinanden folgende Rekker: forrest en 
vel udviklet Underlebe, derefter 2 Par normalt ud- 
viklede Kjever. 
- Underleben (Fig. 10, 1, Fig. 11) bestaar af 2 
symetriske Halvdele eller Lappe, forbundne i Midten 
ved en tynd Membran. Enhver Sidelap er stottet 
af en noget bueformig Chitinplade, der ved Basis 
henger sammen med den tilsvarende forreste Kjave 
(se Fig. 10), og hvis Ende danner en smalt afrundet 
indbsiet Lob besat med tette Haar. Indad fort- 
setter Chitinpladen sig i en tyndere, halvt mem- 
branos Lamelle, der ligeledes er fint haaret i den 
indre Kant og lengere bagtil har et tet tveerstribet 
marginalt Parti. Af andre Forskere er Underlebens 
Sidelappe tydede som iste Kjevepar, hvad der 
aabenbart er urigtigt, da disse Lappe er fuldstendig 
ubeveegelige og desuden forbundne i Midten ved en 
tydelig Membran. Meerkelig er iethvertfald hos ner- 
verende Gruppe Tilstedeveerelsen af en vel udviklet 
Underlzbe, som hos de hoiere Crustaceer. Thi hos 
andre Phyllopoder, ligesom ogsaa hos den store Fler- 
hed af Entomostraceer, sees neppe en Antydning til 
denne Del. 
Iste Par Kjzever (Fig. 10 m', Fig. 12) danner 
hver en i Enden oxeformigt udvidet Chitinplade, der 
med sin tilspidsede Basis er forbunden med Under- 
lebens Chitinskelet, og derfor ved Dissection ial- 
mindelighed faaes i Sammenheng med Underleben. 
Paa Grund af Chitinsubstantsens Elasticitet kan de 
imidlertid til en vis Grad beveges imod hinanden, - 
og en Del tydelige Muskler, der lober skraat indad, 
besorger denne enkle Bevegelse. Paa den oxe- 
formigt udvidede indre Ende er de bevebnede med 
talrige korte Pigge og en hel Del stive Borster. 
Det forreste Hjorne danner en serskilt, noget paa- 
tvert stillet Lap, som er forsynet med en Del noget 
steerkere Pigge. 
2det Par Kjever (Fig. 1, m*, Fig. 13), der af 
andre Forskere (Packard) feilagtigt er tydede som 
et Slags Kjevefodder, er af mere membranos Be- 
‘skaffenhed og ender indad med en afrundet, tunge- 
formig Tyggelap, besat med-talrige grovt cilierede 
Borster. Paa den ydre Side findes en stumpt conisk 
af en noget. lignende spongios Beskaffen- 
Denne Udvidning 
maa nermest opfattes som et Slags rudimenter 
_ Fodderne er, som ovenfor neynt, overordentlig 
talrige, idet der paa den bagre Del af Truncus 
{Metasome) findes mange flere Fodpar end der er 
10 — G. 0, Sars: Fawna Norvegiz. 
73 
The innermost tooth is faintly tripartite, and is 
finely ciliated on its inner edge (fig. 9). 
The remainder of the oral parts now follow 
closely behind the mandibles (see Pl. XII, fig. 1), 
and are not very easy to separate from one ano- 
ther, being partially connected by a system of 
strong chitinous fillets. It is not, however, difficult 
to see that they form 3 consecutive series: in front, 
a well-developed inferior lip, and then 2 pairs. of 
normally-deyeloped maxille. 
The inferior lip (figs. 10,1, 11) consists of 2 sym- 
metrical halves or lobes, connected in the middle 
by a thin membrane. Each lobe is supported by a 
somewhat arched chitinous lamella which is united 
at the base to the corresponding anterior maxilla 
(see fig. 10), and whose end forms a narrowly 
rounded, incurved, thickly ciliated lobe. The chiti- 
nous lamella is continued inwards in the form of a 
thinner, half-membranous lamina also finely ciliated 
on the inner edge, and whose marginal part, farther 
back, is thickly barred transversely. The lateral 
lobes of the lower lip are designated by other na- 
turalists as the first pair of maxilla, but this is 
clearly incorrect, as these lobes are quite immo- 
vable, and are connected in the middle by a distinct 
membrane. The presence, in this group, of a well- 
developed inferior lip, as in the higher Crustacea 
is, at all events, remarkable; for in other Phyllo- 
poda, as also in the majority of Entomostraca, there 
is scarcely an indication of this part. 
Each of the first pair of maxille (figs. 10 m’, fig. 
12) has the form of a securiformly expanded chitinous 
lamella, which is connected by its pointed base with 
the chitine skeleton of the inferior lip, and is there- 
fore, when dissected, generally detached in conjunc- 
tion with that part. On account of the elasticity of 
the chitine however, they can, to a certain extent, be 
moved towards one another, and several distinct 
muscles, running obliquely inwards, effect this simple 
movement. On the securiformly expanded inner end, 
the maxille are armed with numerous short spines, 
and a number of stiff bristles. The foremost corner 
is in the form of a peculiar, somewhat obliquely- 
placed lobe, furnished with a few stronger spines. 
The second pair of maxille (fig. 1 m*, fig. 13) 
which have been incorrectly interpreted by other 
naturalists (Packard) as a sort of maxilliped, are of 
a more membranous nature, and terminate inside 
with a rounded linguiform masticatory lobe, clothed 
with numerous coarsely ciliated bristles. On the 
outer side, there is a bluntly conical expansion 
of a spongy nature, somewhat similar to that of 
the epipodites of the legs. This expansion should 
probably be regarded as a sort of rudimentary palp. 
The legs, as stated above, are remarkably 
numerous, there being on the posterior part of the 
trunk (the metasome), many more pairs of legs 
