- Project Runeberg -  Den Norske Nordhavs-expedition 1876-1878 / The Norwegian North-Atlantic Expedition 1876-1878 / 6. Bind /
107

(1880-1901)
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107

land (Miers), Østkysten af Nordamerika (Wilson). Da
vis-strædet (Hansen! og det sibiriske Ishav (Stuxberg) og er
saaledes ifolge sin Forekomst en udpræget arktisk og
eir-cumpolar Fonn.

/

North America (Bell). Greenland (Miers), the East Coast
of North America (Wilson). Davis Straits (Hansen), and
the Siberian Polar Sea (Stuxberg), and is therefore,
according to its occurrence, a prominent Arctic and
circuni-polar form.

34. Chætonymphon spinosum. (Goodsiri.

(Pl. XI. Fig. 3, a—i).

Nymphon spinosum, Goodsir. Edinburgh New Phil. Journal,
Vol. 32, p. 139, Pl. III. Fig. 3.

— Idem, Ann. Nat. Hist. Vol. 14. p. 3,
PI. 1, Fig. 17, 18.
Chætonymphon spinosum, G. O. Sars, Pycnogonidea borealia
& arctica, No. 34.

Artscharacter. Legemet noget mindre undersætsigt
end hos foregaaende Art, med Sidefortsatserne mere
tydeligt skilte og Rygsiden af Segmenterne besatte med lange
og stærke bagud krummede Borster. Hovedsegmentet
omtrent som hos Ch. hirtipes, men med noget smalere
Hals. Øieknuden stærkt ophoiet, opsvulmet i Enden;
Lindserne større end hos foregaaende Art. Snabelen lidt
kortere end Hovedsegmentet, cylindrisk. Saxlemmerne lig
samme hos Ch. hirtipes, men med kortere Palm og
betydelig længere og tyndere Fingre. Følerne spinklere og
mindre tæt børstebesatte end hos denne Art. De falske
Fodder hos Hannen mindre robuste, med öté Leil kortere
og mere sparsomt børstebesat; Randtornerne lancetformige
og i sin hele Længde tydeligt saugtakkede. Gaugfodderne
neppe mere end 3 Gange længere end Legemet, noget
mindre robuste end hos de 2 foregaaende Arter og rundt
om tæt besatte med ualmindelig lange og stive Borster,
2det Lægled omtrent 2’/s Gang længere end det terminale
Afsnit, Tarsalleddet smalere end hos foregaaende Art,
Fodleddet over dobbelt saa langt som Tarsalleddet, smalt
lineært, med talrige Torner af ulige Længde langs hele
Inderkanten; Endekloen noget mere end halvt saa lang
som Fodleddet, Bikløerne vel udviklede, af Kloens halve
Længde. Ægmasserne mindre end hos Ch. hirtipes, med
faa og meget store Æg. Farven graa, med brunligt
gjen-nemskinnende-Tarmsystem. Legemets Længde 8’/j™;
Spandvidde 51"".

Bemærkninger. Nærværende Art, der af enkelte
senere Forskere synes at være forvexlet med foregaaende,
staar denne vistnok meget nær, men er ved nøiere
Undersøgelse let og sikkert at adskille, saavel ved den
ualmindelig stærke Børstebesætning som ved Øieknudens Form,
samt Saxlemmernes og Gangføddernes Bygning. At den
er identisk med Goodsir’s Art finder jeg ganske utvivlsomt,
baade paa Grund af Overensstemmelser i Beskrivelsen og
fordi den liar en mere sydlig Udbredning end de øvrige
Arter af Slægten.

34. Chætonymphon spinosum, (Goodsir).

i PL XI, fig. a—i).

Nymphon spinosum. Goodsir. Edinburgh New Phil. Journal,
Vol. 32, p. 139, PI. III. fig. 3.
— — Idem, Ann. Nat. Hist. Vol. 14, p. 3,

Pl. I, ligs. 17, 18.
Chætonymphon spinosum, G. O. Sars, Pycnogonidea borealia
& arctica, No. 34.

Specific Characters. Body somewhat less thickset
than in the preceding species, with the lateral processes
more distinctly defined, and the dorsal side of the
segments beset with long and prominently backwards curved
bristles. Cephalic segment about as in Ch. hirtipes. but
with somewhat narrower neck. Oculiferous tubercle
exceedingly elevated, swollen at the extremity; lenses larger
than in the preceding species. Proboscis a trifle shorter
than the cephalic segment, cylindric. Chelifori as in Ch.
hirtipes, but with shorter palm and considerably longer and
thinner fingers. Palpi more slender and less densely
set-ous than in that species. False legs in male less robust,
with the 5th joint shorter and more sparingly beset with
bristles; marginal spines lanceolate, and distinctly serrate
throughout the whole of their length. Ambulatory legs
scarcely more than 3 times longer than the body, a little
less robust than in the 2 preceding species, and beset all
round with remarkably long and stiff bristles, 2nd tibial
joint about 2’/^ times longer than the terminal section, tarsal
joint narrower than in the preceding species, propodal
joint more than twice as long as the tarsal joint,
narrow-linear, with numerous spines of unequal length along the
whole of the inner edge; terminal claw a little more than
half as long as the propodal joint, auxiliary claws well
developed, half the length of the claw. Egg-masses
smaller than in Ch. hirtipes, with few and very large
ova. Colour grey, with brownish intestinal system shining
through. Length of body 8l/3™"; extent 51"".

Remarks. The present species, confounded apparently
by certain later naturalists with the preceding one, does
indeed approximate that form very closely, but, on further
examination, is easily and surely distinguished, both by
the remarkably strong setous covering as well as by the
form of the oculiferous tubercle, and the structure of the
chelifori and ambulatory legs. That the form is identical
with Goodsir’s species. I regard as quite indubitable, both
from agreements in description and because it has a
more southerly distribution than the other species of the
genus.

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