19 
lsengere nedad delvis dsekker dettes Sidefloie. Den nedre 
Del or fortil afrundet, men bairtil uddraget i en skarp lige 
nedadrettet Spids. Epimererne paa 2det Segment er be- 
tydelig bi'edere og dsekker en Del saavel af lste som 3die 
Segment. De er i Enden bredt afrundede og her bevseb- 
nede med 2 tandformige Fremspring. 3die og 4de Segments 
Epimerer er atter noget smalere og ligeledes 2tandet. ->te 
Segments Epimerer er noget bagudrettede og i Kanten be- 
vmbnede med 4 Tnsnder. Sidste Segment er betydelig sma- 
lere end de ovi'ige og uden tvdelige Epimerer, men nedentil 
paa liver Side forsynet med en tydeligt markerct Lsengde- 
kjol, der i Forbindelse med de 2 dorsale Kjoler giver dette 
Segment et ruesten qvadratisk Gjennemsnit. Dets bagre 
Kant gaar oventil ud i 2 lange dolkformige Spidser, der 
Hgesom omfatter Roden af det midterste Halevedliamg. og 
euhver af de ventrale Kjoler ender ligeledes med et tem- 
melig stserkt tandformigt Fremspring. 
Paa Bugsiden af de 5 forreste Segmenter Andes mel- 
lem Roden af Svommevedhamgene en hoi sammentrykt Tom. 
0inene (Fig. 3) er forholdsvis meget smaa, med korte 
og tykke Stilke. Den facetterede Del. der viser et morkt, 
brunsort Pigment, er ikke som ssedvanlig fortykket, men 
tvertimod af ringere Diameter end selve 0ienstilken ved 
Roden. Den daekkes oventil for en Del af en tilspidset 
med nogle korte Borster hesat Fortsats. 
lste Par Folere (Fig. 4) er lam lidet udviklede, 
neppe mere end llnlvt saa lange som Rygskjoldet. og be- 
staar som ssedvanlig af et 31eddet Skaft og 2 mangeleddede 
Svober. Skaftets lste Led er usesten dobbelt saa langt 
som de 2 ovrige tilsammen og gaar ved Roden paa den 
ydre Side ud i en bred, nrnsten hjerteformig Fortsats, der 
er udtrukket i en skarp, noget udadboiet Spids. loit- 
satsen omslutter, som hos andre Macrurer , en temmelig 
rummelig Hule (Horecavitet), som aabner sig udad med en 
trang spaltformig Aabuing paa den nedre Side ; den er i 
Kanterne iint cilieret og desudeu paa den ovre Side nsei 
den ydre Rand forsynet med 5 — G lange sabelformige Torner. 
Den ydre Del af Leddet er cylindrisk og i begge Kanter, 
men ismr den indre, tret besat med tynde, fint cilerede 
Borster. Paa den nedre Side Andes naer den indre Kant 
og omtrent i Midten af Leddets Leengde et lidet fortilrettet 
tornformigt Fremspring, hvorfra en Kjol strmkker sig bagtil. 
Skaftets sidste Led er ganske kort, neppe mere end halvt 
saa langt som 2det og i Enden skraat alskaaret; begge 
Led i Kanterne borstebesatte. 
Svoberne forholder sig noget ulige hos begge Kjon, 
Hos Hunnerne (Fig. 4) er de neppe lsengere end Skaftet 
og indbyrdes omtrent af ens Lfengde. Den ydre Svobe, 
der ved et meget beva'geligt, kort og tykt. mesten skaal- 
carapax, whereas, farther down, they partially overlap the 
lateral lobes of that part. The lower division is rounded 
anteriorly, but posteriorly produced into a sharp point 
directed straight downward. The epimera on the 2nd 
segment are considerably broader and partially overlap both 
the 1st and 3rd segments. At the extremity they are broadly 
rounded, exhibiting here 2 dentiform projections. The epimera 
of the 3rd and 4th segments are again much narrower and. 
also bidentate. The epimera of the 5th segment are some- 
what posteriorly directed and furnished along the margin 
with 4 teeth. The last segment is much more slender than 
the others and without any true epimera, but below-, on each 
side, provided with a distinctly marked longitudinal cariua, 
which, in conjunction with the 2 dorsal carinag, gives to 
the transverse section of this segment .an almost quadrate 
appearance. Its posterior margin projects above with 2 
long dagger-shaped points, that embrace, as it were, the 
base of the telson, and each of the ventral carinse ter- 
minates likewise in a comparatively strong dentiform projec- 
tion. 
On the ventral surface of the 5 anterior segments, 
occurs between the bases of the pleopods a high, compressed 
spine. 
The eyes (fig. 3) are comparatively very small, with 
short and thick pedicles. The cornea, which exhibits a dark, 
brownish -black pigment, is not, as commonly the case, 
dilated, but. on the other hand, smaller in diameter than the 
pedicle of the eye itself at the root. It is covered above, 
partially, by an acutely pointed projection, beset with short 
bristles. 
The 1st pair of antennae (fig. 4) are but slightly 
developed, being scarcely more than half as long as the 
carapax, and consist as usual of a triarticulate peduncle 
and 2 multi-articulate Aagella. The 1st joint of the peduncle 
attains almost twice the length of the other 2 taken together, 
and at the outer side is seen projecting from its base a 
broad, almost cordiform process, which is produced into a 
sharp, somewhat outwardly bent point. The projection en- 
closes. as in other Macrura, a rather spacious chamber 
(auditory cavity), which opens exteriorly with a narrow, 
fissure-shaped orifice on the lower side; along the margins 
it is finely ciliated, and on the upper side, in proximity 
to the outer margin, furnished besides w-ith 5 or 6 ensiform 
spines. The terminal portion of the joint is cylindrical, 
and on both sides, but more especially the inner, closely 
beset with slender, finely ciliated bristles. On the lower 
side, near the inner margin, and about in the middle of 
the longitudinal diameter of the segment, occurs a small, 
anteriorly directed, spiniform projection, from which a short 
keel extends posteriorly. The last joint of the peduncle 
is very short, scai*cely more than half the length of the 
2nd, and the extremity obliquely truncate: both articula- 
tions furnished with bristles along the margins. 
The flagella are somewhat different in the two sexes. 
The females (fig. 4) have them scarcely longer than the 
peduncle and w-ell-nigh uniform in length. The outer flag- 
ellum. connected with the peduncle by an extremely mobile, 
3 * 
