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115
Gangfødderne forlængede, men af robust Bygning,
Fodloddet længere end Tarsalleddet og uden tydelige Torner i
Inderkanten; Endekloen konisk tilspidset, Bikløerne yderst
smaa, næsten obsolete. Ungerne forbliver fastklamrede til
Hannens Legeme længe efter at Larvelivet er tilendebragt.
Bemærkninger. Jeg har fundet det rigtigt at
opstille denne nye Slægt til Optagelse af den i flere
Henseender anomale Fonn Nymplion robustum Bell. Slægten,
der hidtil kun er repræsenteret af denne ene Art, er især
charaeteriseret ved den eiendommelige Bygning af
Saxlem-merne og ved Beskaffenheden af de falske Fodder, navnlig
hvad Randtornerne og Endekloen angaar, tildels ogsaa ved
Gangfoddernes Structur. Den eiendommelige
Omstændighed, at Ungerne vedbliver at være fastklamrede til
Hannens Legeme, selv efter at have opnaaet mere end den
halve definitive Størrelse, er ogsaa anført blandt
Slægts-eharacterne, da noget lignende, saavidt mig bekjendt, ikke
er fundet hos nogen anden Pycnogonide.
without secondary teeth; terminal claw smooth.
Ambulatory legs elongated, but robust in structure; Propodal
joint longer than tarsal joint, and without distinct aculei
on the inner margin; terminal claw conically acuminated;
auxiliary claws extremely small, almost obsolete. The
young remain firmly adherent to the body of the male
long after the larval existence is terminated.
Remarks. I have considered it right to establish
\liis new genus for the adoption of the, in several respects,
anomalous form. Nymplion robustum, Bell. The genus,
which, hitherto, is only represented by that one species,
is especially characterized by the peculiar structure of
the chelifori and by the nature of the false legs,
principally in respect of the marginal spines and the terminal
claw, partly also by the structure of the ambulatory legs.
The peculiar circumstance that the young continue to
remain firmly adherent to the body of the male, even after
they have attained more than half the definite size, is also
remarked among the generic characters, as a similar
relation, so far as I am aware, has not been found in any
other Pycnogonid.
37 Boreonymphon robustum (Bell).
(Pl. XII, Fig. 3, a-d).
Nymphon robustum, Bell, Belcher’s Last of the Arctic
Voyages, Vol. II. p. 409, PI. XXXV. fig. 4.
Nymphon abyssorum, Norman, i Wyville Thomson’s ,.The
Depths of the Sea", p. 129.
Nymphon liians, Heller, Crustaceen, Pycnogoniden und
Tunicaten der K. K. Oester. Ungar. Nordpol.-Lxped.,
p. 17, Tab. V, Fig. 3—5.
Nymphon robustum, G. O. Sars, Prodrom. descr. Crust. &
Pycnogonid. p. 265.
— — Hoek, Pycnog. Will. Barents, p. 20,
Pl. II, figs. 35—40.
— Hoek, Pycnog. of „Knight Errant",
Zool. Chall. Exped. P. X, Vol. Ill, p. 97.
-—• Hansen, Kara-Havets Pycnogonider, p.
4, Tab. XVIII, Fig. 1.
Boreonymphon robustum, G. O. Sars, Pycnogonidea
borealia & arctica, No. 37.
Artscharacter. Legemet tykt og robust, med
Segmenterne meget skarpt afsatte og noget fremspringende
bagtil, Sidefortsatserne massive, næsten kolleformige, kortere
end Legemet er bredt paa Midten. Hovedsegmentet længere
end de 3 følgende Segmenter tilsammen. Halsen stærkt
indkneben, neppe mere end halvt saa bred som Kroppen
paa Midten; Pandedelen særdeles stor og massiv, 3 Gange
bredere end Halsen, og rendeformigt fordybet efter Midten,
med stærkt opsvulmede Sidedele. Halesegmentet
horizontal^ cylindriskt, afrundet i Spidsen. Alle Integumenter
ru af smaa mikroskopiske Pigge. Øieknuden yderst liden,
37. Boreonymphon robustum (Bell).
(Pl. XII, fig. 3, a—d).
Nymphon robustum, Bell, Belcher’s Last of the Arctic
Voyages, Vol. II, p. 409, Pl. XXXV, fig. 4.
Nymphon abyssorum, Norman, in Wyville Thomson’s „The
Depths of the Sea" p. 129.
Nymphon hians, Heller, Crustaceen, Pycnogoniden und
Tunicaten der K. K. Oester. Ungar. Nordpol.-Exped.
p. 17, Pl. V, figs. 3—5.
Nymphon robustum, G. O. Sars, Prodrom. descr. Crust. &
Pycnogonid. p. 265.
— Hoek, Pycnog. Will. Barents p. 20,
Pl. II. figs. 35—40.
Hoek. Pycnog. of „Knight Errant",
Zool. Chall. Exped. P. X. Vol. Ill, p. 97.
— Hansen, Karahavets Pycnogonider. p.
4, PI. XVIII, fig. 1.
Boreonymphon robustum, G. O. Sars, Pycnogonidea
borealia & arctica, No. 37.
Specific Characters. Body thick and robust, with
the segments very distinctly defined and somewhat
prominent posteriorly, lateral processes massive, almost
clavi-form, shorter than the breadth of the body at the middle.
Cephalic segment longer than the 3 succeeding segments
together; neck greatly constricted, scarcely more than
half the breadth of the body at the middle; frontal part
particularly large and massive, 3 times as broad as the
neck, and canalicularly hollowed along the middle, with
strongly swollen lateral parts. Caudal segment horizontal,
cylindrical, rounded at the point. Integuments everywhere
15*
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