55 
0inene er vel udviklede, skjondt ikko meget store og 
ne Ppe fremragende til Siderne. Af Form er de meget kort 
pseredannede eller naesten kredsformige, noget fladtrykte og 
v ed en smalt udlobende Stilk fiestede temmelig nmr ind til 
hinanden. Den facetterede Del indtager oventil (se Fig. 23) 
kuu den yderste eller marginale Zone, medens den nedentil 
bar en storre Udbredning, Pigmentet er af merle rpdbrun 
Farve og viste paa det nys optagne Exemplar et lignende 
brillant guldglindsende Sltjser, som er omtalt hos Parery- 
throps spedabilis. 
Iste Par Foleres iSkaft er af kraftig Bygning og i 
Henseende til Leddenes Form og indbvrdes Lamgdeforhold 
meget nmr overensstemmende mod samme bos B. ardica og 
B - tridens. Det sserdeles korte knudeformige og tret baa- 
rede Appendix ved Enden af Skaftet er ligeledes fuld- 
stamdig af samme Ddseende som hos Hannen af b. ardica. 
Den ydre Svobe bar den for de 2 omtalte Arter charac- 
teristiske lamellsere Udvidning ved Basis. 
-dot Par Foleres Blad (se Fig. 24) er af betydelig 
Lamgde, nemlig over dobbelt saa langt som 1 ste Pars Skaft, 
men af en meget smal. naesten lancetdannet Form, med 
ben storste Brede neppe l /s af Laengden. Det afsmalnes 
stj erkt mod Spidsen, som, uligt bvad Tilfeldet pleier at 
'sere, er skraat afskaaret i Retningen udenfra indad, med 
det ydre Hjerne staerkt fremragende og gaaende ud i et 
dvarpt tandformigt Fremspring. Svobens fekalt er lorholdsvis 
k °rt, men staerkt, omtrent lig af Bladets Lsengde. Ende- 
delens Lamgde lean ikke bestemmes, da dens ydre Parti 
' ar afbrukket, ligesom Endepartiet af begge Svober paa 
Iste Par Fplere. 
Fodderne stemmer i alt vaesentligt fuldkommen overens 
111 e d samme bos den typiske Art. Det ydre Parti (Fig. 25) 
bestaar ogsaa her, foruden Endekloen, af 3 tydeligt afsatte 
Fed, hvoraf det yderste er sserdeles smalt. 
Bagkroppens Buglemmer (se Fig. 22) er samtlige ud- 
'iklede til msegtige Svpmmeredskaber, der i sin Bygning 
stemmer nrer overens med samme bos Hannen af B. ardica. 
Den indre Gren paa Iste Par (Fig. 26) er ligesom bos 
denne Art uleddet og pladeformig samt i den indre Ivant 
torsynet med en Rad af 10 Tomer. Den ydre Gren paa 
-det Par er betydelig stserkere forlaenget end paa de ouige 
Far, og dens ydre Led er istedetfor med de ssedvanlige 
Fandborster bevmbnede med korte Torner. 
Dot midterste Halevedbaeng (Fig. 27) er af betydelig 
Storrelse omtrent saa langt som de 2 sidste Bagkropsseg- 
meter tilsammen og af den for Slsegten characteristiske 
atiangt-firkantede Form. Det afsmalnes kun hoist ubetyde- 
bgt mod Enden og bar Sidekanterne naesten fuldkommen 
samt bevsebnede med et stort Antal af smaa, noget 
'F'ge udviklede Torner, der dog mangier ved det basale 
Farti. Enden er som bos Slmgtens ovrige Arter dybt md- 
skaaret i Midten. Indsnittet, der omtrent indtager V« af 
' edheengets Laengde, er i Bunden afrundet og dets Ranter 
ovaebnede med stserke, kamformigt ordnede Tsender. Ende- 
Tbe eyes are well developed, though not particularly 
large, and project but very little, if at all. toward the sides. 
In shape, they are abrupt-pyriform, or almost circular, some- 
what bevelled, and attached by a slender stem comparatively 
close together. The cornea occupies, above, only the outer- 
most or marginal zone (see fig. 23), whereas, below, it lias 
greater extent. The pigment is a dark reddish-brown, that 
in the living specimen exhibited the brilliant golden lustre 
recorded as occurring in Parerytlirops spedabilis. 
The peduncle of the 1st pair of antenme has a powerful 
structure, and, as regards the relative length of the joints, 
closely corresponds with that in B. ardica and B. tridens. 
Moreover, the exceedingly short, tuberculiform, and densely 
ciliated appendix at the extremity ol the peduncle, has 
precisely the same appearance as that in the male of B. 
ardica. The outer flagellum exhibits the lamelliform dilatation 
at the base characteristic of the 2 species in question. 
The scale of the 2nd pair of antennae (see fig. 24) is 
of considerable length, viz. twice as long as the peduncle 
of the 1st pair, but very slender, almost lanceolate in form, 
its greatest breadth scarcely attaining one-fifth of the length. 
It tapers abruptly toward the point, winch, unlike what 
usually occurs, is obliquely truncate, from without to within, 
and has the outer corner very considerably protending and 
drawn out to a sharp, dentiform projection. The ped- 
uncle of the flagellum is comparatively short, but strong, 
measuring in length about one-third of that of the scale. 
The length of the terminal portion cannot be determined, 
its outer part having been broken oft; this was the case, 
too, with the terminal part of both flagella on the 1st pair 
of antenna;. 
The legs agree perfectly in all essential characteristics 
with those in the typical species. The outermost portion 
(fig. 25) consists in this animal too, not including the 
terminal claw, of 3 well-defined joints, of which the last is 
exceedingly slender. 
The abdominal limbs (see fig. 22) are all developed to 
powerful natatory organs, which, in structure, agree closely 
with those in the male of B. ardica. The inner branch of 
the 1st pair (fig. 26) is, as in that species, non-articulate 
and lamelliform, and has, along the inner margin, a series 
of 10 spines. The outer branch on the 2nd pair is much 
more produced than on any of the other pairs, and has, 
in place of the usual marginal bristles, its outer joint armed 
with short spines. 
The telson (fig. 27) is of considerable size, about as 
long as the 2 last segments of the abdomen taken together, 
and has the oblongo-quadrate form characteristic of the genus. 
It tapers but very slightly toward the end, and has the 
lateral margins almost perfectly straight, as also- furnished 
with a large number of small, somewhat unequally developed 
spines, which, however, are wanting on the basal part 
of the telson. The extremity appears, as in the other * 
species of the genus, deeply incised in the middle. The 
incision, occupying about one-sixth of the length of the 
appendage, is rounded off at the bottom, and has the margins 
