115 
Gang&dderne forlamgede, men af robust Bygning, Fodled- 
det lsengere end Tarsalleddet og uden tydelige Torner i 
Inderkanten ; Endekloen konisk tilspidset, Bikloeine yderst 
smaa, nsesten obsolete. Ungerne forbliver lastklamiede til 
Hannens Legome lamge efter at Larvelivet er tilendebragt. 
Bemserkninger. Jeg bar fundet det rigtigt at op- 
stille denne nye Slaegt til Optagelse af den i Here Hen- 
seender anomale Form Nymphon robustum Bell. Slsegten, 
dor hidtjl kun er reprsesenteret af denne ene Art, er isser 
characteriseret ved den ciendonunelige Bygning af Saxlem- 
merne og ved Beskaffenhedeu af de falske Fodder, navnlig 
livad Randtornerne og Endekloen angaar, tildels ogsaa ved 
Gangfpddernes Structur. Den eiendommelige Omstsendig- 
hed, at Ungerne vedbliver at vtere fastklamrede til Han- 
nens Legeme, selv efter at have opnaaet mere end den 
halve definitive Storrelse, er ogsaa anfort blandt Slsegts- 
characterne, da noget lignende, saavidt mig bekjendt, ikke 
er fundet hos nogen anden Pycnogonide. 
37. Boreonymphon robustum (Bell). 
(PI. 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 Mans, Heller, Crustaceen, Pycnogoniden und 
Tunicaten der K. K. Oester. Ungar. Nordpol.-Exped., 
p. 17, Tab. V, Fig. 3—5. 
Nymphon robustum, G. 0. Sars, Prodrom. descr. Crust. & 
Pycnogonid. p. 265. 
_ — Hoek, Pycnog. Will. Barents, p. 20, 
PI. II, figs. 35—40. 
— — Hoek, Pycnog. of „Knight Errant 11 , 
Zool. Chall. Exped. P. X, Vol. Ill, p. 97. 
— — Hansen, Kara-Havets Pycnogonider, p. 
4, Tab. XVIII, Fig. 1. 
Boreonymphon robustum, G. O. Sars, Pvcnogonidea bore- 
alia & arctica, No. 37. 
Artscharacter. Legemet tykt og robust, med Seg- 
menterne meget skarpt afsatte og noget fremspringende 
bagtil, Sidefortsatserne massive, nsesten kolleformige, korter'e 
end Legemet er bredt paa Midten. Hovedsegmentet lsengere 
end de 3 folgende Segmenter tilsammen, Halsen stserkt 
indkneben, neppe mere end lialvt saa bred som Rroppen 
paa Midten; Pandedelen sserdeles stor og massiv, 3 Gange 
bredere end Halsen, og rendeformigt fordybet efter Midten, 
med staerkt opsvulmede Sidedele. Halesegmentet horizon- 
talt, cylindriskt, afrundet i Spidsen. Alle Integumenter 
ru af smaa mikroskopiske Pigge. Giekmiden yderst liden, 
without secondary teeth; terminal claw smooth. Ambul- 
atory 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 
this new genus for the adoption of the, in several respects, 
anomalous form. Nymphon robustmn, 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, prin- 
cipally 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 rela- 
tion, so far as I am aware, has not been found in any 
other Pycnogonid. 
37. Boreonymphon robustum (Bell). 
(PI. 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, in Wyville Thomson’s „The 
Depths of the Sea“ p. 129. 
Nymphon Mans, Heller, Crustaceen, Pycnogoniden und 
Tunicaten der K. K. Oester. Ungar. Nordpol.-Exped. 
p. 17, PI. V, figs. 3 — 5. 
Nymphon robustum, G. O. Sars, Prodrom. descr. Crust. & 
Pycnogonid. p. 265. 
— Hoek, Pycnog. Will, Barents p. 20, 
PI. 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. 0. Sars, Pycnogonidea bore- 
alia & arctica, No. 37. 
Specific Characters. Body thick and robust, with 
the segments very distinctly defined and somewhat promi- 
nent 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 
ti>* 
I 
