Testes (Tab. VI, Fig. 11,t) har Formen af et 
Par forholdsvis smaa, sekformige Organer, der, uligt 
hvad Tilfeeldet er med Ovarierne, ikke streekker sig 
ind i Forkroppen, idet de fortil kun rekker til Be- 
gyndelsen af forreste Kjonsring, hvorimod deres 
bagre tilspidsede Ende strekker sig mere eller min- 
dre ind i 1ste Bagkropssegment. I nogen Afstand 
fra den forreste Ende udgaar nedad og bagtil Sed- 
lederen, der begynder med et noget blereformigt 
udvidet Parti, forestillende et Slags Sedbeholder. 
Ved Basis af de ydre Kjonsvedheng indsnevres 
dette Parti pludseligt til en trang Kanal, der gjor 
en sterk Bugtning inden den treder ind i selve 
Kjonsvedhenget (p), paa hvis Spids den udmunder. 
Sperma bestaar (se Fig. 12) af smaa klare Celler 
med tydelig Kjerne, imellem hvilke sees en Del 
endnu mindre og mere ugjennemsigtige Smaakugler. 
Udvikling. — Jeg har desverre ikke havt An- 
ledning til at forfolge den hele Udvikling af ner- 
verende Form, men har dog leilighedsvis paatruffet 
‘en Del Udviklingsstadier, hvoraf jeg her kortelig 
skal omtale nogle. 
. Det tidligste Larvestadium, jeg har fundet, er 
afbildet Tab. VIL, Fig. 15, og maa nermest cha- 
racteriseres som et Metanauplius-Stadium, forsaavidt 
‘som der allerede er tydelige Anleg til 7 Par Lem- 
mer bag de egentlige Munddele. Det egte Nauplius- 
Stadium er, som bekjendt, udmerket ved Tilstede- 
verelsen af kun 3 Par Lemmer, nemlig de 2 Par 
Folere og Mandibularfodderne, og i dette Stadium 
forlader nerverende Form, som de fleste ovrige 
Phyllopoder, igget. 
Legemet er i det her cmbandlede Stadium af- 
langt pereformigt, gradvis afsmalnende bagtil og 
stumpt afrundet fortil, uden tydelig Begreendsning 
af Hoved, Krop og Hale. De sammensatte Gine er 
.endnu ikke udviklede, og kun det enkle Vie tilstede 
i Midten helt fortil. iste Par Folere er endnu gan- 
ske korte, men rager tydeligt frem fortil og er paa 
Spidsen udrustede med lignende Vedheng som hos 
det voxne Dyr. 2det Par Folere er meget forskjel- 
lige fra samme hos det voxne Dyr, og udviklede til 
megtige Svommeorganer eller Aarer. De udsprin- 
ger, noget ventralt, til hver Side af den forreste 
Del af Legemet, lige bag 1ste Par, og er ialminde- 
lighed rettede lige udad. Man kan paa dem ad- 
skille en tyk og boielig, med-talrige Muskler fyldt 
Basaldel eller Skaft, og 2 ulige udviklede Grene. 
Skaftet er af cylindrisk Form og viser flere circu- 
lere Indsnoringer som en Antydning til Leddeling. 
Det udsender indad 2 mod Mundaabningen rettede 
Fortsatser, hvoraf den ydre, der udspringer ner 
Enden af Skaftet, har Formen af en grov, pigformig 
Borste, cilieret i sin ydre Del, medens den indre er 
klovet i Enden til 2 cilierede Borster. Under Aarer- 
nes Bevegelser bliver disse Fortsatser afvexlende 
The testes (Pl. VI, fig. 11,t) are in the form 
of a pair of comparatively small bag-like organs, 
which, unlike the ovaries, do not extend into the 
anteriot division of the body, but only as far for- 
ward as the beginning of the foremost genital segment. 
Their posterior pointed ends, on the other hand, 
extend more or less into the lst segment of the tail. 
At some distance from the anterior end issues, in a 
downward and backward direction, the spermatic 
duct, beginning with a bladder-like enlarged portion, 
representing a kind of seminal vesicle. At the base 
of the external sexual appendage, this part suddenly 
contracts to a narrow channel, which makes a sharp 
eurve before it actually enters the sexual appen- 
dage (p) at the point of which it discharges itself. 
The sperm (see fig. 12) consists of small, clear cells 
with distinct nuclei, among which there are a few 
still smaller and more opaque spherules. 
Development. — I have unfortunately had no 
opportunity of following the whole course of devel- 
opment of the present form, but have, however, 
occasionally come across certain stages of develop- 
ment, some of which I will now briefly mention. 
The earliest larval stage that I have found is 
represented on Pl. VIII, fig. 15, and may be best 
characterized as a metanauplius stadium, in as much 
as there are distinct indications of 7 pairs of limbs 
behind the oral region proper. The true nauplius 
stadium, as is well known, is distinguished by the 
presence of only 3 pairs of limbs, namely, the 2 pairs 
of antenne and the mandibular legs, and at this 
stage, the present form, like most other Phy Mopnda, 
leaves the egg. 
In the stage now under consideration, the body 
is oblong, pyriform, gradually narrowing posteriorly 
and bluntly rounded anteriorly, without any distinct 
division into head, body and tail. The compound eyes 
are not yet developed, and only the ocellus is present 
in the middle in front. The first pair of antenne are 
as yet quite short, but distinctly project in front, and 
are armed at the point with appendages similar to 
those in the full-grown animal. The second pair of 
antenne are very different from that pair in the full- 
grown animal, and have the character of powerful 
natatory organs, or oars. They have their origin a 
little ventrally at each side of the anterior part of 
the body, just behind the first pair, and generally 
point straight out. A thick, flexible basal part or 
scape, filled with numerous muscles may be distin- 
guished, and 2 unequally developed rami. The scape 
is cylindrical in form, and exhibits several circular 
constrictions as an indication of articulation. It 
sends out inwards, towards the oral aperture, 2 pro- 
jections of which the outer one, which springs from 
near the end of the scape, has the form of a coarse 
spike-like bristle, ciliated on the outer part; while 
the inner one is cloven at the end into 2 ciliated 
