76 
ved Spidsen et Par meget lange og tynde Burster. De 4 
forste Led forestiller Skaftet, de 2 sidste Svqben. 
Munddeleue visev sig. naar Dyret sees nedenfra (se 
Pig. 7) sammentraengte paa et forholdsvis lidet Hum og til 
Siderne indesluttede af de paa Bugsiden ombqiede Sidedele 
at' Hovedskjoldet. Fortil mellem Roden af 2det Par Folere 
benuerkes en liden afrundet brkantet. noget fremspringende 
Plade. der forestiller Overbeben. IJmiddolbart bag denne 
og tildels daekket af samme sees de brunt farvede Tsender 
paa Kindbakkernes indre Under. Den ovrige Del af disse 
Organer ligesoni TTnderlseben og Kjseverne daddies derimod 
fordetmeste ganske af Kjasvefodderne. Disse riser en lig- 
nende Bygning som hos SI. Sphyrapus. Den 4-leddede Palpe 
er noget udadrettet og langs den indre Kant taet besat med 
storke indadkrummede Burster. 
lste Pod par (se Fig. 6 og 7) er som bos de ovrige 
til denne Tribes horende Former udviklede ti! smrdeles 
kraftige Griberedskaber. De udspringer temmelig user sam- 
men med en bred Basis fra den bagerste Del af Hovedseg- 
mentets Yentralside og retter sig med en stork Sformig Boi- 
ning fortil langs Siderne af Hovedskjoldet. Leddene er saer- 
deles brede, noget sammentrykte fra Siderne og fyldte med 
kraftige Muskier; de 2 sidste danner tilsaminen en vel ud- 
viklet Sax, der indtager omtrent l / 3 af Fodens Lamgde. 
Fingrene, der neppe er kortere end Pa.lmen, ender med en 
skarp, sterkt krummet og bornfarvet Spids og viser langs 
den indre Kant nogle uregelmmssige tandformige Fremspring, 
der gribe ind mellem hverandre, naar Saxen er lukket (sml. 
Fig. 14); i dette Tilfielde krydser Spidserne hinanden meget 
stair kt. 
De Ovrige Fodpar (se Fig. 5 og 6) er alle omtrent 
af ens Udseende og forestiller de egentlige Gangfodder. De 
er af meget spinkel Form, med Basalleddet storst, men 
neppe bredere end de ovrige Led. Endekloen er paa alle 
ganske kort og simpel, ligesom de paa disse Fodpar festede 
Borster er smaa og faa i Antal. 
Bagkroppens Buglemmer (se Fig. 8 og 9) er ganske 
og aldeles rudimentore og saa smaa, at de meget let kan 
forbisees. De er imidlertid tilstede i det smdvanlige Antal 
og faestede nser de afrundede Sidekanter af de 5 forreste 
Segmenter (se Fig. 8). De bestaar som said van ligt af en 
Basaldel og 2 Endeplader; men disse sidste er ssordeles 
smaa og mangier ganske ethvert Spor af Borster, hvorfor 
disse Lenuner lieller ikke kan fungere som Svomnieredskaber. 
bvortil desuden deres ringe Stprrelse vilde gjore dem ganske 
utjenlige. 
Halevedbffingene (se Fig. 8 og 10) er forholdsvis meget 
korte, paa langt nser ikke af sidste Segments Lsengde, og 
viser ialmindeligbed en skraa Retning indad mod Midtlinien, 
saa at, naar Dyret sees ovenfra, oftest kun de lange Ende- 
borster rager frem fra Segmentets bagre Rand. De bestaar 
remarkably small, and not visible save when highly magni- 
fied ; it bears at the point a couple of very long and slender 
bristles. The 4 first joints represent the peduncle, the 2 
last the flagellum. 
The oral appendages — on viewing the animal from 
below (see fig. 7) — appear crowded over a relatively small 
space and enclosed at the sides by the lateral parts of 
the cephalic shield, that bend over on the ventral surface. 
Anteriorly, between the bases of the 2nd pair of antenna!, 
is seen a small, rounded, quadrate, somewhat projecting plate, 
representing the labrum. immediately posterior to this 
plate, and partially covered thereby, appear the brown- 
coloured teeth, at the inner extremities of the mandibles. 
The remaining portion of these organs, as also the labium 
and the maxilla 1 , are, on the other hand, as a rule, entirely 
concealed by the maxillipeds. The latter exhibit a similar 
structure to those in the genus Sphyrapus. The four-jointed 
palp is directed somewhat outward, and closely beset along 
the inner margin with strong incurving bristles. 
The 1st pair of legs (see figs. G. 7) are, as in the 
other forms belonging to this tribe, developed to exceedingly 
powerful organs of prey. They have their origin rather 
close together, with a broad base, from the posterior part 
of the ventral side of the cephalic segment, proceeding an- 
teriorly, in a strong, S-shaped curve, along the sides of 
the cephalic shield. The joints are exceedingly broad, some- 
what compressed from the sides, and provided with powerful 
muscles; the 2 last constitute together a well -developed 
chela, measuring about one-third of the length of the leg. 
The fingers, scarcely at all shorter than the palm, terminate 
in a short, exceedingly curved, and horn-coloured point, and 
exhibit, along the inner margin, a few irregular, dentiform 
projections, that fit in between one another when the chela 
is closed (see fig. 14), the points then crossing very prom- 
inently. 
The remaining pairs of legs (see figs. 5. 6) have all 
about the same appearance, and represent the true pereio- 
poda. They are exceedingly slender in form, with the 
basal joint largest, but scarcely at all broader than the 
other joints. The terminal claw is without exception quite 
short and simple, the bristles, too, attached to these pairs 
of legs being likewise small and few in number. 
The abdominal limbs (see figs. 8, 9) are in every sense 
rudimentary, and so small as to be easily overlooked. Mean- 
while, they are present in the usual number, and attached 
close to the rounded lateral margins of the 5 anterior seg- 
ments of the abdomen (see fig. 8). They consist as usual 
of a basal part and 2 terminal plates; but the latter are 
exceedingly small, and do not exhibit a trace of bristles; 
hence these parts can by no means serve as natatory or- 
gans, for which, too, their small size must render them 
wholly inefficient. 
The caudal appendages (see figs. 8, 10) are compara- 
tively very short, not attaining by far the length of the 
last segment, and have as a rule an oblique, inward direction 
towards the medial line, so that, on viewing the animal 
from above, it is generally the terminal bristles alone that 
