119 
1 ste Par i Regelcn (herfra alene undtaget Skugten Asellus) 
hos Hunnen er omformet til en enkelt, operkelformig Plade, 
'I' l' daekker de ovrige 4 Par, som alle forcstiller rngte Ee- 
s pirationsorganer; hos Hannon er denne Plade af meget 
1 0lll plieeret Bygning og del vis modificeret til Copulations- 
I( ‘dskaber. Den her omhandlede Tribus indbefatter for 
rn* i 
iclen 2 Familier, nemlig Asellidce og Munnopsidw. 
natatory appendages, whereas the 1st pair, as a rule (saving 
only the genus Asellus), in the female, are transformed 
into a single operculiform plate, covering the 4 remaining 
pairs, all of which represent true organs of respiration; 
in the male, this plate exhibits an exceedingly complex 
structure, and is modified in part to organs of copulation. 
The tribe treated of here comprises at present 2 families, 
viz. the Asellidce and the Munnopsidce. 
Fain. 1. Asellidse. 
Fam. 1. Asellidae. 
^en. 1. ^Aearatlioniscixs, G. 0. Sars. 1878, n. 
Gen. 1. xAcantlionisciis, G. 0. Sars. 1878, n. 
Crustacea et Pyenogonida nova etc. 
Crustacea et Pyenogonida nova etc. 
Slsegtscharacteristik. Legemet fladt og bredt med 
Ele Segmenter lost forbundne med hinanden og gaaende 
U| 1 i laterale fligformige Fortsatser. Bagkroppen bestaaende 
•d et enkelt i Kanterne saugtakket, skjoldformigt Segment, 
ngen 0iue. Folerno af en lignende Bygning som hos 
l ,e gten Janira. lste Fodpar ikke forskjelligt fra de Ovrige, 
'die mgte Gangfodder. Halevedhsengene med forkenget cy- 
indrislc Stamme og 2 korte Endegrene. 
Generic Character. — Body flat and broad, witli all 
the segments loosely connected together, and laterally 
jutting out as lobular projections. Posterior division of 
body consisting of a siugle scutiform segment. No eyes. 
Antennae similar in structure to those in the genus Janira. 
First pair of legs differing in no wise from the others — 
all true pereiopoda. Caudal appendages furnished with an 
elongate cylindric trunk, having 2 short terminal branches. 
Bemserkninger. Nmrvterende Skegt slutter sig meget 
Ud;l ' Id Skegteu Janira Leach, fra hvilken den dog skiller 
ved den fuldstamdige Mangel af Dine samt derved, at 
saifl tlige Fodder er af ens Udseende og rngte Gangfodder, 
u den at lste Par, saaledes som hos hin Sliegt, er udviklet 
dl Griberedskaber. Slsegten indeholder for Tiden lain den 
Tt( 'denfor nsermere beskrevne Art. 
Remarks. — The present genus approximates very 
closely the genus Janira Leach, from which it nevertheless 
differs in the absolute want of eyes, and in the legs being 
all of uniform appearance and true pereiopoda, not with 
the 1st pair, as in that genus, developed into organs of 
prey. The genus counts at present but one species, that 
described below. 
26. Acanthoniscus typhlops, G. 0. Sars, n. sp. 
26. Acanthoniscus typhlops, G. 0. Sars, n. sp. 
(PI. X, Fig. 27 — 150). 
(PI. X, figs. 27 — 30). 
"'i thoniscxts typhlops, (t. 0. Sars, Crustacea et Pyenogonida nova etc., 
No. 1). 
Acanthoniscus typhlops , Gf. 0. Sars, Crustacea et Pyenogonida nova etc., 
No. 9. 
Artscharacteristik. Legemet af oval Form, med Bre- 
en storre end den halve Lamgde og Segmenterne skarpt 
j l dskilte. Hovedet forsynet med et i Enden tvedelt Pande- 
0rn °8 2 laterale fligformige Fortsatser til liver Side. 
e Forkropssegmenter i Midtlinien bevsebnede med en 
(Padrettet dorsal Torn. Epimererne paa lste Segment 
® ln 5pelt tilspidsede, paa de 3 folgende tvefligede, paa de 3 
a gerste 3-fligede. Bagkropssegmentet halvcirkelforinigt, med 
Specific Character. — Body oval in form, with bre- 
adth exceeding one-half of length, and segments sharply 
defined. Head furnished with a rostrum, bipartite at ex- 
tremity, and 2 lateral projections on either side. All 
the segments armed on the medial line with a dorsal 
spine, directed upwards. Epimera on 1st segment simple 
pointed, on the 3 succeeding , segments two-lobed, on the 
3 posterior three-lobed. Abdominal segment semicircular 
