115 



Gangfødderne forlængede, men af robust Bygning, Fodled- 



det hengere end Tars.illeddet og uden tydelige Torner i 

 Indérkanten; Endekloen konisk tilspidset, Bikloerne yderst 

 smaa. næsten obsolete. Ungerne forbliver fastklamrede til 

 Hannens Legeme henge efter at Larvelivet er tilendebragt. 



Bemærkninger. Jeg har fundet det rigtigt at op- 

 stille denne nye Slægt til Optagelse af den i flere Hen- 

 seender anomale Form Nymphon robustum Bell. Slægten, 

 der hidtil kun er repræsenteret af denne ene Art, er især 

 characteriseret ved den eiendommelige Bygning af Saxlem- 

 merne og ved Beskaffenheden af de falske Fødder, navnlig 

 hvad Randtornerne og Endekloen angaar, tildels ogsaa ved 

 Gangfoddernes Structur. Den eiendommelige Omstændig- 

 hed, at Ungerne vedbliver at være fastklamrede til Han- 

 nens Legeme, selv efter at have opnaaet mere end den 

 halve definitive Storrelse. er ogsaa anført blandt Slægts- 

 characterne, da noget lignende, saavidt mig bekjendt, ikke 

 er fundet hos nogen anden Pycnogonide. 



37. Boreonymphon robustum (Bell). 

 (Pl. XII. Fig. :;. a-d). 



Nymphon robustum, Bell, Belchers Last of the Arctic 



Voyages, Vol. II. p. 409, Pl. 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. Sårs, 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. III, p. 97. 



Hansen, Kara-Havets Pycnogonider, p. 



4. Tab. XVIII, Fig. 1. 

 Boreonymphon robustum, G. 0. Sårs, Pycnogonidea bore- 



alia & arctica, No. 37. 



Artscharacter. Legemet tykt og robust, med Seg- 

 menterne 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 horizon- 

 talt. cylindriskt, afrundet i Spidsen. Alle Integumenter 

 ru af smaa mikroskopiske Pigge. Øieknuden 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; 

 auxiliaiv claws extremely small, almost obsolete. The 

 young remain firmly adherent to the body of the male 

 long after the larval existence is terminated. 



Bemarks. I have considered it right to establish 

 'tliis new genus for the adoption of the, in several respects, 

 anomalous form. Nymphon robustum, Bell. The genus, 

 whicli. liitherto. is only represented by that one species, 

 is especially characterized by the peculiar structure of 

 the chelifori and by tlie 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 i. 



(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. 0. Sårs. 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. III, p. 97. 



Hansen, Karahavets Pycnogonider. p. 



4, Pl. XVIII, fig. 1. 

 Boreonymplwn robushim, G. 0. Sårs, Pycnogonidea bore- 



alia & arctica, No. 37. 



Speeific Characters. Body thick and robust, with 

 the segments very distinctly defined and somewhat promi- 

 nent posteriorly, lateral processes massive, almost clavi- 

 fonii, 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 

 partieularly 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 



i.-.* 



