17 
viser en meget ujevn Overflade, idet saavel Rygskjoldet som 
Bagkropssegmenterne er tydeligt skulpterede dels raed ure- 
gelmaessige knudrede Forhoininger, dels med skarpt marke- 
rede langsgaaende Kjider, der paa visse Steder hsever sig 
i Form af koie, sammentrykte tornformige Fortsatser. 
Nogen tydelig Haarbessetning er lain at se kings de 
frie Kanter af Rygskjoldet og Bagkropssegmenterne, medens 
selve Rygfladen er pan. det nmrmeste ganske nogen. 
Rygskjoldet (se Fig. 1 og 2), der omtrent indtager 
] /a af Totallsengden, er oventil stierkt kvselvet og kun i sin 
allerforreste Del noget nedtrykt. Sect fra Rygsideu (Fig. 1) 
er det nsesten overalt af ens Brede, seet i Profil (Fig. 2) 
viser det sig derimod fortil ketydelig smalere end kagtil, 
idet de nedre frie Kanter er fortil stierkt opstigende, medens 
de bag Midten danner en stank kueformig Boining nedad. 
Rygskjoldets Hoide er paa dette Sted neppe mindre end 
Breden. 
Som ovenfor anfflrt. er Rygskjoldets Overflade meget 
ujevn. Man bemserker saaledes 3 meget skarpt markerede 
Lfengdekjoler, der fra den bagre Rand strmkker sig forover, 
en i Midten og en paa liver Side. Den midterste eller 
dorsale Kjol, der er tydelig i kele Rygskjoldets Lsengde, 
gaar ud i 3 sserdeles store, sammentrykte, fortilkrummede 
tornformige Fortsatser, alle omtrent at ens TJdseende og 
skilte ved lige Mellemrum. Den bagerste af disse, der ial- 
mindeligked er lidt mindre end de ovrige 2, staar i kort 
Afstand fra Rygskjoldets bagre Rand, den iorreste noget 
bag Roden af Pandekoruet. Sidekjolerne er kagtil temmelig 
lave, men hsever sig foran Midten til 2 lignende, dog noget 
mindre. slype vt udnd og fortil rettede Tomer, kvoraf den 
bagerste omtrent staar i sannne Tvaerlinie som den midterste 
af de dorsale Fortsatser. Lamgere fortil taker disse Side- 
kjoler sig ganske, og Rygskjoldet viser ker et noget ior- 
dybet Parti, der udad begrsendses af en sserdeles stor tri- 
angulaert tilspidset og noget skraat ndadrettet, horizontal 
Fortsats. der. naar Rygskjoldet sees ovenfra (Fig. 1) ind- 
tager dettes forreste Sidekjerner. Disse Fortsatser, der, 
skjondt langt mindre udviklede, ogsaa forefindes bos de ovrige 
Crangonider, synes at svare til de saakaldte Branchiostegal- 
torner lios andre Macrurer. Rige nedenunder de omtalte 
Fortsatser sees et meget lidet tandformigt Fremspring, som 
er Pterygostomialtoraen. 
Pandehornet viser et fra de ovrige bekjendte Crango- 
nider temmelig afvigende 1 dseende. Det er forkoldsvis af 
ikke ubetydelig Storrelse, ved Roden bredt og fladtrykt, 
men derpaa pludselig strnrkt sammentrykt fra Siderne og 
oxef'ormigt udvidet. dannende nedentil en i Kanterne tset 
bcrstebesat vertikal Plade. Selve Endcn ai Pandekornet 
er udtrukket i en lang og skarp, skraat opadrettet, lancet- 
formig Spids, der raikker betydelig udover lste Par Foleres 
Basalled, og giver Dvret, seet fra Siden (Fig. 2) et ganske 
eget Physiognomi. 
exhibit an exceedingly uneven surface, both the carapax 
and the abdominal segments being distinctly sculptured, 
partly with rough, irregularly disposed prominences and 
partly with sharply marked longitudinal carinae, which, in 
places, rise as high, compressed, spiniform projections. 
Any distinct covering of hair cannot be detected save 
along the free margins of the carapax and the abdominal 
segments, whereas the dorsal surface itself is well-nigh 
j wholly naked. 
The carapax (see figs. 1, 2), which occupies about 
one-third of the total length, is above exceedingly arcuate, 
its most anterior portion only being slightly depressed. 
Viewed from the dorsal side (fig. 1), it appears almost 
everywhere of equal breadth ; seen in profile (fig, 2), on the 
other hand, it is much narrower anteriorly than posteriorly, 
the inferior free margins ascending considerably throughout 
the anterior part, whereas, behind the middle division, they 
form an exceedingly arcuate descending curvature. The height 
of the carapax is here about the same as the breadth. 
As stated above, the surface of the carapax is very 
uneven. Thus, it exhibits 3 very sharply marked longitudinal 
carinse, extending forward from the posterior margin, one 
in the middle and one on either side. The median or 
dorsal carina, distinct throughout the whole length of the 
carapax, rises into 3 exceedingly large, compressed, anter- 
iorly curved, spiniform processes, all well-nigh uniform in 
appearance and separated by equal spaces. The hinder- 
most of these, which, as a rule, is somewhat smaller than 
the other 2, is placed at a short distance from the posterior 
margin of the carapax, the most anterior a trifle behind 
the basis of the rostrum. The lateral carina; are posteri- 
orly rather low, but, in front of the middle part, rise as 
2 similar, but somewhat smaller, spines, pointing obliquely 
outward. and forward, of which the more posterior about 
j occupies the same transverse line as the median of the 
dorsal processes. Farther forward these lateral carina; dis- 
appear altogether, and the carapax exhibits here a somewhat 
depressed area, which, exteriorly, is bounded by an extremely 
large, triangular-acute, horizontal projection, pointing some- 
what obliquely outward, which, when the carapax is seen 
from above, occupies its antero-lateral angles (fig. 1). These 
processes, though much less developed, also occur in the other 
Crangonidians, corresponding apparently to the so-called 
branckiostegal spines in the other Macvura. Immediately 
beneath the aforedescribed processes, is seen an extremely 
small dentiform projection — the pterygostomial spine. 
The rostrum exhibits a structural appearance diverging 
considerably from that in the other known Crangonidm. 
In size it is by no means inconsiderable, at the root broad 
and depressed, but from thence suddenly much compressed 
laterally and securiform, constituting below a vertical plate, 
closely beset along the margins with bristles. The extremity 
of the rostrum is produced into a, long and acute, lanceolate, 
and obliquely upturned point, which projects considerably 
beyond the basal segment of the 1st pair of antennae, and 
gives to the animal — - lateral aspect (fig. 2) — a highly charac- 
teristic appearance. 
I.)en norske Nordhavsexpedition. G. 0. Sars: Crustacea. 
3 
