62 
hos Branchinecta, dannende en aflang oval spongios | those at the end being the longest. The epipodite 
Plade, uden Spor af Borster. Ovenfor denne er til 
Ydersiden af Stammen festet 2 tildels hinanden 
dekkende tynde, afrundet ovale Plader, der begge 
maa opfattes som Dekplader. De er af noget ulige 
Storrelse, idet den overste er adskilligt mindre end 
den nederste, og begge har Kanterne ganske glatte, 
uden Spor af Sagtakker. 
Sidste Fodpar (Fig. 11) skiller sig fra de ovrige, 
foruden ved sin ringe Storrelse, ved den fuldsten- 
dige Mangel saavel af Epipodit som Basalplader. 
Exopoditen er serdeles liden og kun forsynet med 
6 Randborster. Endopoditens yderste Lap er langt- 
fra saa fremragende som paa de ovrige Par og har 
et ringere Antal af Randborster, alle ganske korte. 
Ligeledes er Borsterne paa de 2 basale Lappe be- 
tydelig mindre udviklede end paa de ovrige Par, og 
kun ganske svagt boiede. 
Beskrivelse af Hannen. 
Uligt hvad Tilfeeldet er med Branchinecta og. 
som det synes ogsaa med andre Branchipodider, er 
Hannerne af nerverende Form gjennemgaaende 
noget mindre end Hunnerne og overskrider neppe 
en Lengde af 10 mm. 
Legemet er (se Tab. IX, Fig. 3 og 4) noget min- 
dre langstrakt, og baade Hovedet og Halen vesent- 
lig ulige samme hos Hunnen. MHovedet er af me- 
get betydelig Storrelse og viser oventil et sadel- 
formigt Indtryk. Fortil ender det med 2 finger- 
formige og noget divergerende Pandefortsatser, der 
er nedadkrummede og skilte i Midten ved et halv- 
maaneformigt Indsnit (se ogsaa Tab. X, Fig. 2). Til 
hver Side, tilsyneladende som en umiddelbar Fort- 
seettelse af Hovedet, udgaar med en bred Basis de 
eiendommeligt formede Gribeantenner (se Tab. IX, 
Fig. 3 og 4, Tab. X, Fig. 2). Enhver af disse er 
delt i 3 paa hinanden folgende indadkrummede fin- 
gerformige Grene, hvoraf den forreste er storst og 
synes at forestille den egentlige Stamme, medens 
de 2 ovrige nermest er at betragte som secundeere 
Sidegrene. Den bagerste Gren er betydelig mindre 
end de ovrige, stumpt tilrundet i Enden, og rundt 
om besat med fine Haar, medens de 2 ovrige kun 
er haarede langs ad den indre concave Kant (se Tab. 
IX, Fig. 5). Sammen med de 2 Pandefortsatser vil 
disse Lemmer,. naar de boies ind mod _ hinanden, 
kunne virke som et serdeles effektivt Gribe- og 
Fastholdningsapparat. 
Minene, Iste Par Folere, Munddelene og Bran- 
chialfodderne skiller sig i ingen Henseende fra 
samme hos Hunnen. 
_Derimod er Bagkroppen meget forskjellig og be- 
_ essentially unlike those parts in the female. 
resembles in appearance that in Branchinecta, and 
forms an oblong, oval, spongy lamella, without a 
trace of bristles. Above this, to the outer side of 
the stem, are fastened 2 thin rounded oval lamine, 
partly overlapping one another, which must be re- 
garded as cover-plates. They are somewhat unequal 
in size, the upper one being considerably smaller 
than the lower; and the edges of both are quite 
smooth, without a trace of serrations. 
The last pair of legs (fig. 11) are distinguished 
from the others not only by their small size, but 
also by the total absence of both epipodite and 
basal’ laminee. The exopodite is very small and fur- 
nished with only 6 marginal bristles. The outer- 
most lobe of the endopodite is not nearly so pro- 
jecting as in the other pairs, and has a smaller 
number of marginal bristles, all quite short. The 
bristles on the two basal lobes are also considerably 
less developed than in the other pairs, and only 
slightly curved. 
Description of the Male. 
Unlike the Branchinecta, and also, as it seems, 
the other Branchipodide, the males of the present 
species are generally rather smaller than the females, 
and scarcely exceed 10 mm. in length. 
The body (see Pl. IX, figs. 3 and 4) is somewhat 
less elongated, and both the head and the tail are 
The 
head is of very considerable size, and exhibits above » 
a saddle-like depression. It ends in front with two 
digitiform, and somewhat divergent frontal proces- 
ses, which are curved downwards and divided in the 
middle by a cresent-shaped notch (see also Pl. X, 
fig. 2). On each side, from a broad base, there 
issue, apparently as an immediate continuation of 
the head, the peculiarly formed prehensile antenne 
(see Pl. IX, figs. 3 and 4, Pl. X, fig. 2). Each of 
these is divided into 3 successive, incurved, digiti- 
form rami, of which the foremost is the largest, and 
seems to represent the stem proper, while the other 
two may be considered more properly as secondary 
lateral branches. The hindmost ramus is consider- 
ably smaller than the others, is bluntly rounded at 
the end, and fringed all round with fine hairs, while 
the other two are only hairy along the inner con- 
cave edge (se Pl. IX, fig. 5). In conjunction with 
the two frontal processes these two limbs, when 
‘bent in towards one another, can act as a most 
effectual seizing and holding apparatus. 
The eyes, the first pair of antenne, the oral 
parts and the branchial legs do not differ in any 
respect from those organs in the female. 
The posterior division of the body, on the other 
