43 
vsesentlig fra de ovrige, idet denue Gren her er meget koit 
og af simpel oral Form. Ligeledes bemserkes nogen Foi- 
skjel i disse Lemmer mellem begge Kjon. Hos Hannen 
er de idetliele kraftigere byggede, med forlioldsvis koiteie 
og bredere samt mindre rigeligt bprstebesat Basaldel. Den 
indre Gren paa lste Par (se Fig. 28) er ogsaa betjdelig 
bredere end hos Hunnen og liar Bnden naesten tvaert af- 
kuttet. Paa 2det Par (Fig. 29) findes fsestet til den indre 
Gren 2 Appendices, hvoraf det torreste og korteste svarer 
til samme hos Hunnen, medens det 2det er sseregent for 
Hannen og liar F ormen af en smal tungedannet Piade, der 
i Kanterne er besat med stserke tornformige Burster. 
Det midterste Halevedhseng (Fig. 25) er af en over- 
ordentlig smal og langstrakt Form og rager betydeligt nd 
over de vdre Halevedhseng (se Fig. 1). I sin forreste 
Fjerdepart er det af nogenlunde cylindrisk Form, men af- 
smalnes derpaa hurtigt og jevnt bagtil, saa at det yderste 
Parti bliver sserdeles smalt. Selve Spidsen (Fig. 26) ei 
noget udvidet og riser en noget udbuet Enderand, hvoi'til er 
fsestet 7 Tomer. De 5 midterste af disse er indbyrdes af 
ens Storrelse og Udseende, hvorimod de 2 yderste er langt 
kraftigere udviklede og mere end 3 Gange saa lange saint 
stserkt divergerende til liver Side. Langs Siderne af Yed- 
hsenget og noget nsermere den dorsale Flade bemserkes en 
Rsekke af 6 meget smaa Tomer. 
De ydre Halevedhseng (Fig. 27) liar en ganske koit 
og simpel Roddel. Af Endepladerne er den indre lancet- 
formig og rundt om besat med lange Fjaerbdrster. Den 
ydre Piade er noget lsengere end den indre og i Spidsen 
noget skraat afskaaret, med den ydre Kant ganske lige og 
besat med korte og fine Borster, den indre svagt buet. 
Yed det ydre Hjorne findes en sserdeles liden og rudimentaer 
Torn. Pladen er forpvrigt ganske simpel, uden Spor af 
nogen Tvsersutur i sit yderste Parti. 
I levende Tilstand er liele Dvrets Legeme tilligemed 
dets forskjellige Yedhfeng af en sserdeles intensiv og pragt- 
fuld blodrod Farve. De lange Svober paa Ffflerne viser i 
sit basale Parti mere eller mindre tydeligt afvexlende mprkere 
og lysefe Ringe eller Tvserbaand. 0iepigmentet er som 
ovenfor a, n fort opakt hvidt. 
Lsengden af de storste Individer, er, maalt fra An- 
tennebladenes Spids til Enden af det midterste Halei ed- 
hseng, 83’"'". Hannerne synes i Regelen at vsere stprre end 
Hunnerne. 
Udvikling. Den betydelige Storrelse af de under 
Hunnens Bagkrop fsestede rEg (se Fig. 2) lader formode, 
at Udviklingen enten som hos Slsegten Bvthocaris sker 
directe, eller at den i al Fald kun er forhunden med en 
ufuldstsendig Metamorphose. Kun hos et enkelt Exemplai 
fandtes imidlertid Udrogn, og denne var her endnu ikke 
saa udviklet. at nogen UndersOgelse i nsevnte Retning kunde 
anstilles. 
De mindste erlioldte Exemplarer, af kun 1C”'" 1 Lrengde 
in this respect distinguished from the rest chiefly by the said 
branch being exceedingly short and of a simple oval form. 
Some difference, too, is observed in these parts on com- 
paring the sexes. In the male, they have on the whole a 
more powerful structure, with the basal portion compara- 
tively shorter and broader, and less densely beset with 
bristles. The inner branch on the 1st pair (see fig. 28) 
is also considerably broader than in the female, and has 
the extremity almost truncate. On the 2nd pair (fig. 29), 
are seen, • attached to the inner branch, 2 appendices, of 
which the anterior and shortest corresponds to that m the 
female, while the other is peculiar to the male, and has 
l| the form of a narrow, linguiform plate, beset along the 
margins with strong, spiniform bristles. 
The telson (fig. 25) is remarkably narrow and elongate 
in form, and projects considerably beyond the outer caudal 
appendages (see fig. 1). Its anterior fourth has an ap- 
proximately cylindric form, and thence it rapidly and uni- 
formly tapers in a posterior direction, the hindmost part 
thus becoming exceedingly narrow. The point itsell (fig. 
26) is somewhat dilated, and exhibits a slightly outw Aid- 
curving terminal margin, to which are attached 7 spines. 
The 5 middle ones are uniform in size and appearance, 
whereas the 2 outermost are far more powerfully developed, 
and upwards of 3 times the length of the others, as also 
widely diverging to either side. Along the sides of the 
appendage, and somewhat nearer the dorsal surface, is observed 
a series of 6 exceedingly small denticles. 
The outer caudal appendages (fig. 27) have a short 
and simple basal part. Of the terminal plates, the inner 
is lanceolate, and beset round the edge with long, plumose 
bristles. The outer plate is a trifle longer than the inner, 
and at the point somewhat obliquely truncate, with the 
outer margin perfectly straight and beset with short and 
slender bristles, the inner slightly arcuate. At the outer 
corner, occurs an exceedingly small and rudimentary denticle. 
For the rest, the plate is quite simple, without the slightest 
trace of a transverse suture in its outermost part. 
In a living state, the whole body of the animal, to- 
gether with its various appendages, has an exceedingly 
vivid and brilliant blood-red colour. The long flagella of 
the antenna? exhibit in their basal part more or less dis- 
tinctly alternating rings, or transverse bands. The ocular 
pigment is, as stated above, opaque white. 
The length of the largest individuals met with, mea- 
sured from the point of the antennal scale to the tip of 
the telson, was 83""". The males would as a rule appear 
to be larger than the females. 
Development. — The very considerable size of the 
e „„ s attached beneath the abdomen of the female (see fig. 
2)^ gives reason to surmise, that the development, either 
occurs direct, as in the genus Bythocans, or that, at all 
events, it is merely connected with an imperfect metamor- 
phosis! Meanwhile, roe was found in a single specimen 
only, and the stage of development did not admit of under- 
taking any investigation with the said object in view. 
The smallest individuals obtained, measuring 16””" in 
6 * 
