69 
Kindbakkerne, der, naar Dyret sees nedenfra (se Fig. 3), 
Mser sig som t« temmelig store couvese Fremstaaenheder 
til liver Side al' Overheben, er af tenunelig kraftig Bygning 
°g starkt incrusterede. Deres Corpora bar (se Fig. 9) den 
saalvarilige baaddannede Form og fyldes af de sterke Ad- 
ductormuskler. der i Midten gaar over i en chitinagtig 
Aponeurose. Deres indre Del gaar ud i 2 divergerende 
bortsatser, bvoraf den forreste gaar i lige Flugt med Corpus 
og forestiller Kindbakkens egentlige Endeparti; den ernoget 
mdadkrummet og i Enden delt i 2 taudbmrende Plader, 
der torholder sig noget ulige paa Loire og venstre Kind- 
bakke (se Fig. 10). Paa venstre Kindbakke er begge Plader 
omtrent ligestore og dsekker hinanden gjensidig; pan h 0 ire 
Eindbakke er den bagerste ineget liden, naesten cylindrisk 
°g ved Spidsen besat med nogle tine Turner. Lige bag 
disse Plader Andes paa begge Kindbakker en Rad al simple 
tornf'onnige Burster. 4 paa boiere og 5 paa venstre. Den 
bagre Fortsats, der udgaar fra Kindbakkens Corpus nsesten 
under en vet Yinkel, forestiller Tyggeknuden. Den er smalt 
cylindrisk, noget tyndere mod Enden og her tbrsynet med 
den smdvanlige riflede Sculptur. Kindbakkernes Palpe (b ig. 
11 > cr meget spinkel og kun yderst sparsomt borstebesat. 
J) ™ bestaar af 3 tydelige Led, bvoraf det 2det er Lengst 
og ved Enden j den one Kant tbrsynet med en enkelt kort 
Lorste. Sidste Led er ganske lidet, koniskt og ender med 
- noget starkere Burster. 
Iste Par Kjmver (Fig. 12) bar 2 tydeligt udviklede 
fovtilrettede Tyggelapper, hvoraf den ydre er starkest og 
paa Enden bevmbnet med talrige spidse Torner, medens 
den indre er af membranos Beskaffenhed, tungeformig og 
v °d Spidsen forsynet med 4 cilierede Burster, bra Adei- 
s *d('U at Basaldelen udgaar en lige bagudrettet (Iren ( Palpe), 
der bestaar at 3 utvdeligt begrsendsede Segmenter og ved 
Spidsen er forsynet med 3 starke indadkrummede Burster. 
Lenne Gren rager, Lgesom Epignatben paa Kjsevefqdderne, 
tnit trem i Gjellebulen og synes mermest bestemt til at rense 
samuie for fremmcde Partikler. 
2 dot Par Kjrnver (Pig. 13) er smaa, men normalt ud- 
'iklede. Den noget pladeformige Basaldel danner indad en 
stump Vinkel og har foran denne en tat Bessetning af bne 
Burster. Fortil gaar den ud i en kort afstumpet Tyggelap, 
der foruden med Burster er bevmbuet med 3 sterke, i den 
cue Kant grovt tandede Torner (se Eig. 14). Det ydre 
p urti af Kjaeven. der ved en tydelig Sutur er begrsendset 
ll-a Basaldelen, bestaar af 2 Led, bvoraf det lste indad 
lober ud i en lignende Tyggelap, som den Basaldelen til- 
burende, men kun besat med simple Burster. Endeleddet 
er ganske lidet og forsynet med 5 noget starkere Burster, 
oidnede i 2 Knipper. 
Kjsevefudderne (Fig. 15), som delvis daekker Kjseverne 
uedad ( Se Fig. 3 ) ; bestaar af en 2-leddet pladeformig Ba- 
saldel. som ei . f ast f orbun den men den tilsvarende paa den 
auden Side, en 4-leddet Endedel eller Palpe og en eien- 
The mandibles, which, on viewing the animal from 
below (iig. 3), present the appearance of two comparatively 
large convex protuberances, one on either side of the labium, 
are powerful in structure, and very considerably incrusted. 
Their corpora (see tig. 9) have the usual na vicular form, and are 
filled up with the strong adductor muscles, which, in the middle, 
pass into a chitiuous aponeurosis. Their inner part branches 
out into 2 diverging projections, of which the more anterior 
protends iu the same plane as the corpus, and, strictly, repre- 
sents the terminal part of the mandible; it is somewhat in- 
curved. and divided at the extremity into 2 dentiferous plates, 
differing slightly in character on the right and left mandibles 
(see fig. 10). On the left mandible, the plates are about 
equal iu size, the one covering the other; on the right 
mandible, the posterior one is very small, almost cylindric, and 
at the point beset with a few slender spines. Immediately 
posterior to these plates, on both mandibles, is seen a row of 
simple spiniform bristles, 4 on the right and 5 on the left. 
The posterior projection, jutting out almost at right angles 
from the corpus of the mandible, represents the molar protu- 
berance. It is slender-cylindric, somewhat slimmer toward 
the extremity, where it has the usual grooved sculpturing. 
The palp of the mandibles (fig. 1 1 ) is exceedingly slender, 
and but sparingly furnished with bristles. It consists of 
three distinct joints, of which the 2nd is the longest, and 
has on one of the margins, at the extremity, a. single short 
bristle. The last joint is quite small, conic, and terminates 
with 2 somewhat stronger bristles. 
The 1st pair of maxilla? (fig. 12) have 2 distinctly 
developed, anteriorly directed masticatory lobes, of which 
the outer one is the stronger, and furnished at the extremity 
with numerous acute spines, while the inner lobe is ol a 
membranous character, linguiform. and armed at the point 
with 4 ciliated bristles. From the outer side of the basal 
part proceeds a posteriorly directed branch (the palp), com- 
posed of 3 indistinctly defined segments, and furnished at 
the point with 3 strong, inward-curving bristles. This 
branch — as does also the cpignath on tlie maxillipeds — 
projects freely into the branchial cavity, its chief function 
being apparently to cleanse the latter from detrimental 
particles. 
The 2nd pair of maxillte (fig. 13) are small, but 
normally developed. The somewhat lamelliforin basal part 
forms inward an obtuse angle, anterior to which it has 
a dense armature of slender bristles. Anteriorly, it juts 
out as a short, truncate masticatory lobe, armed, exclusive 
of bristles, with 3 strong, on one side coarsely dentate, spines 
(see fig. 14). The outer portion of the maxilla, separated 
by a distinct suture from the basal part, consists of 2 joints, 
of which the 1st protends inward as a masticatory lobe, similar 
to that on the basal part but furnished merely with simple 
bristles. The terminal joint is quite small, and armed with 
5 somewhat stronger bristles, arranged in 2 bunches. 
The maxillipeds (fig. 15), which, below, partially cover 
the maxilla! (fig. 3), consist of a two-jointed, lamelliforin 
basal part, firmly connected with that corresponding to it 
on the opposite side, a four-jointed terminal part, or palp> 
