57 
P aa lste Par af samme Udseende som paa de dvrige; den 
ydre paa 2det Par overordentlig f'orlsenget. xned de ydre 
Led bevaebnede med korte Tomer. Det midterste Hale- 
vedhseng bagtil noget afsmalnende, til Siderne bevsebnet 
med uligestore Tomer; det bagre Indsnit omtrent som bos 
foregaaende Art. Horeapparatet i Basis af den indre Hale- 
plade fuldsttendig rudimentfert. Farven ensformig lys kjod- 
rod. Leengden indtil 70“'". 
Findested. Stat. 295. 
Bemserkninger. Nservaerende interessante Myside skillei 
s ig i flere Punkter ikke uviesentligt fra de typiske Arter af 
Slsegten og slutter sig. navnlig livad Bygningen at lste Par 
Lfllere og Fodderne angaar, nsermere til den aberrante Ait, 
A megalops G. O. Sars. Saavel fra denne som de dvrige 
Arter er den, foruden ved sin kjmmpennessige Stdrrelse, let 
kjendelig ved 0inenes mserkvserdige og ussedvanlige Form, 
bvilken Character ogsaa bar givet Anledning til Artsbe- 
nsevnelsen. 
Beskrivelse af Hunnen. Legemets Form er (se PI. 
^ L b ig. 1 og 2) noget mindre slank end bos de puige 
Arter af Slsegten, idet Forkroppen nsesten indtager Halv- 
Parten af Totalkengden. Bagkroppen viser den ssedvanlige 
K P inkle. cylindriske Form og. afsmalues ganske svagt bagtil. 
Al dens Segmenter er det sidste lamgst. omtrent ligt de 2 j 
foregaaende tilsammen. 
Bygskjoldet er forboldsvis meget stort, saa at det ikke 
blot, fuldstsendigt dfekker Forkroppen, men ogsaa bagtil for 
en Del skyver sig noget ud over lste Bagkropssegment. 
Lets forreste. foran Cervicalfnren beliggende Parti indtager 
omtrent »/, af bele Rygskjoldets Lsengde og er kjeudeligt 
bredere end Bagkroppens forreste Segment. Panderanden 
61 > Midten noget fremspringende, ndeu dog at danne noget i 
tydeligt Pandehorn, men kun en stump Yinkel. Be nedre 
lorreste Sidebjorner er noget uddragne, men i Spidsen 
stuinpt tilrundede. 
0inene er af en lioist mserkvserdig Beskaffenbed og 
Lorm, idet deres ydre Flade, istedetfor at vsere convex er 
omvendt stserkt indbulet, bvorvcd de nsesten faar en skaal- 
dannet Form. De er fsestede temmelig naer sammen og 
staar verticale, med den couvexe Flade indad, den concave 
udad. Hverken noget specifiskt 0iepigment eller nogetsom- 
belst Spor af Synselementer var at benuerke paa de fiiskt 
indfangede Exemplarer, og den senere Undersdgelse bar 
ogsaa bekrseftet den fuldstamdige Mangel lieraf. 
lste Par Fdleres Skaft (Fig. 4 og 5) er, uligt hvad 
ilfaildet er bos de typiske Artei', simpelt cylindriskt og 
temmelig spinkelt. med lste og sidste Led omtrent hge 
store, 2det tydelig mindre og af fuldkommen normal Form. 
Al Svoberne er den ydre betydelig lamgere og stmrkere 
en d den indre og viser sig ved Basis noget udvidet samt 
ber tag besat med lange baandformige Sandseborster. Ud- 
vidningen er imidlertid ikke saa skarpt begramdset som bos 
oe typiske Arter. men ligner mere samme bos den aberrante 
Loi'm. B. megalops. 
the male all well developed, with greatly produced terminal 
branches; the inner on the 1st pair of similar appearance 
to that on the others; the outer on the 2nd pair remark- 
ably elongate, with the exterior articulations armed with 
short spines. Telson tapering slightly backward, and bearing, 
laterally, spines of unequal size; the posterior incision about 
as in the preceding species. Auditory apparatus at the 
base of the inner caudal plate quite rudimentary. Colour 
a uniform light-red. Length reaching 70“”'. 
Locality. — Stat. 295. 
Remarks. — The present interesting Mysidian differs 
in several respects not unessentially from the typical species 
of the genus, approximating closer, more particularly as 
regards the structure of the 1st pair of antennse and of the 
legs, the aberrant form. B. megalops G. 0. Sars. Both 
from this and the other species, it is, however, let alone 
its great size, easy to distinguish by the remarkable and 
unusual form of the eyes, — a character indeed on which its 
specific designation is founded. 
Description of the Female. - — Form ol the body 
(see PL VI. figs. 1, 2) somewhat less slender than in the 
other species of the genus, the cep halo-thorax measuring 
almost one-half of the total length. The abdominal division 
exhibits the usual slender, cylindric form, tapering but very 
slightly backward. Of its segments, the last is the longest, 
about equal in length to both the preceding ones taken 
together. 
The carapax is comparatively very large, covering not 
only the whole of the anterior division of the body, but 
also jutting' out a little posteriorly over the 1st abdominal 
segment. Its foremost part, anterior to the cervical groove, 
measures about one-third of the whole length of the cara- 
pax. and is obviously broader than the foremost abdominal 
segment. The frontal margin slightly projecting in the 
middle, without however forming a distinct rostrum, but 
merely an obtuse angle. The antero-lateral corners are 
somewhat produced, but obtusely rounded at the point. 
The eyes are very remarkable, alike in character 
and form, their outer surface being, instead of convex, con- 
siderably hollowed, which gives them a well-nigh calyciform 
appearance. They are attached comparatively close together, 
in a vertical position, with the convex surface turning in 
and the concave out. Of any specific ocular pigment, or 
indeed of any visual elements whatsoever, no trace could be 
detected in the recently taken specimens; and subsequent 
examination has fully confirmed the absolute want of such. 
The peduncle of the 1st pair of antenme (figs. 4, 5), 
unlike what is observed in the typical species, is simple- 
cylindric. and somewhat slender, with the first and last 
joints about equal in size, the second considerably smaller, 
and perfectly normal in form. Of the flagella, the outer 
is much longer and more powerful than the inner, as also 
somewhat dilated at the base, where it exhibits a dense 
armature of long, riband-shaped sensory bristles. The dilata- 
tion. however, is less sharply defined than in the typical 
species; it has greater resemblance to that in the aberrant 
form. B. megalops. 
Oen norske Nordliavsexueditoiii. Cr . O. Sars: Crustacea. 
S 
