Subordo I. 
PHYLLOCARIDA 
(Leptostraca, Claus). 
Character. — Branchiopoder med den forreste 
Del af Legemet dekket af et stort, mere eller min- 
dre udpreget tveklappet Rygskjold, forsynet fortil 
med en bevegelig Pandeplade. Den bagre Del af 
Kroppen cylindrisk, afsmalnende bagtil og endende 
med 2 bevegelige Grene (Furca), mellem hvilke der 
undertiden er en dolkformig Haleplade. @inene stil- 
kede og bevegelige. Begge Par Folere vel udviklede, 
mangeleddede, 2det Par enkle, hverken locomotoriske 
eller prehensile. Alle Forkropslemmer bag Mund- 
delene udelukkende respiratoriske; Bagkropslem- 
merne meget ulig disse og fordetmeste locomotoriske, 
manglende paa de bagerste Segmenter. Havdyr. 
Alm. Bemerkninger.— Typen for denne Under- 
orden er den i mange Henseender hoist merkver- 
dige og anomale Slegt Nebalia, om hvis systematiske 
Stilling der har hersket den storste Uenighed blandt 
Zoologerne. Medens man for ialmindelighed med 
Milne-Edwards henregnede denne Form til Phyllo- 
poderne, har i den nyere Tid, navnlig efter de af 
Prof.Claus anstillede Undersogelser, en ganske anden, 
allerede meget tidligt af enkelte Naturforskere ytret 
Opfatning vundet Overhaand, nemlig at denne Form 
slutter sig nermest til de stilkoiede Krebsdyr, navn- 
lig til visse Schizopoder (Euphausiide), og at den 
saaledes snarere tilhorer Malacostraceernes Afdeling 
end Entomostaceerne. Jeg har paa et andet Sted’) 
nermere udviklet mine Grunde til fremdeles at bi- 
beholde denne Slegt under Entomostraceerne, og 
blandt disse er Branchiopoderne de, hvormed ner- 
*) Report on the Phyllocarida, collected during the Expedition 
of H. M. S. «Challenger». 
Sub-Order I. 
PHYLLOCARIDA 
(Leptostraca, Claus). 
Characters. — Branchiopods, with the foremost 
portion. of the body covered by a large, more or 
less distinctly bi-lobate carapace, furnished anteri- 
orly with a mobile frontal plate. The posterior por- 
tion of the body cylindrical tapering backwards, and 
terminating in 2 mobile rami (furca), between which 
there is occasionally a mucroniform caudal plate. 
Eyes pedunculated and mobile. Both pairs of antenne 
well developed, multiarticulate; 2nd pair simple, 
neither locomotory nor prehensile. All the appen- 
dages of the anterior division of the body behind 
the oral parts, exclusively respiratory. The appen- 
dages of the posterior division of the body very 
unlike the former and chiefly locomotory; absent 
on the posterior segments. Marine animals. 
General remarks. The type of this sub-order 
is — the in many respects highly remarkable and 
anomalous genus — WNebalia, regarding whose sys- 
tematic position the greatest difference of opinion 
has prevailed among zoologists. Whilst, previously, 
zoologists in general agreed with Milne-Edwards 
in assigning this form to the Phyllopods, there has 
prevailed in later times, especially since the result 
of the investigations made by Prof. Claus, a 
quite different opinion, which already much earlier 
was expressed by a few naturalists, viz: that this 
form approximates closest to the stalk-eyed Crusta- 
ceans, especially to certain Schizopods (Euphausiide), 
and that it, therefore, pertains rather to the Malaco- 
stracan than to the Entomostracan division. I have 
elsewhere ') explained, in greater detail, my reasons 
fdr still retaining this genus under the Entomo- 
1) Report on the Phyllocarida collected during the Expedition 
of H: M. S. «Challenger». 
