116 



(iigforniig. Snabelen omtrent at Hovedsegmentets Længde, 

 skjævl nedadrettet, konisk afsmalnende. Saxlemmerne lige 

 mist rakte omtrent at' Kroppens Længde, Skaftet indknebet 

 ved Basis. Haanden lidt kortere end Skaftet, Palmen 

 kort. triangulær, ved Enden besat med pigformige Borster. 

 Fingrene næsten dobbelt saa lange, kloformige, næsten 

 halvcirkelformigt krummede. Følerne betydelig kortere end 

 Saxlemmerne, tæt haarede, 2det Led længst, de 3 folgende 

 successivt aftagende i Størrelse, sidste Led meget smalt. 

 De falske Fodder lidt kortere end Legemet, hos Hannen 

 tæt besatte med pigformige Børster, Endedelen betydelig 

 længere end Ste Led, Randtornerne meget smaa, Ende- 

 kloen tynd. Gangføddeme over 3 Gange længere end 

 Legemet, robuste og kun lidet afsmalnende mod Enden. 

 Hofteleddene forholdsvis korte og tykke, Laarleddet ikke 

 meget opsvulmet, 2det Lægled mere end dobbelt saa langt 

 som det terminale Afsnit, Fodleddet l / s Gang længere end 

 Tarsalleddet og betydelig smalere, lineært, uden tydelige 

 Torner i Inderkanten : Endekloen omtrent af Tarsalleddets 

 Længde, jevnt krummet og sylformigt tilspidset ; Bikløerne 

 overordentlig smaa, næsten obsolete. De ydre Ægmasser 

 kugleformige med talrige Æg. Legemets Længde indtil 

 •22""". Spandvidde 154""". 



Bemærkninger. Denne Art er for Tiden den eneste 

 Repræsentant for Slægten Boreonymphon ; thi hverken blandt 

 de talrige af Hoek fra Challenger Expeditionen beskrevne 

 Xymphon-Arter eller blandt de af andre Forskere opforte 

 exotiske Former har jeg fundet nogen Tilnærmelse til den 

 for nærværende Slægt eiendommelige Type. Det bliver 

 derfor ogsaa temmelig vanskeligt at give en præeis Arts- 

 diagnose af nærværende Form. og de her opførte Charac- 

 terer er kun foreløbig sammenstillede i Analogi med samme 

 hos Nymphon-Arterne. 



Beskrivelse. Den sædvanlige Længde af Legemet 

 synes at være omkring 15""", med en Spandvidde af 104"""; 

 men Arten kan undertiden naa en meget betydeligere Stør- 

 relse, idet Længden kan gaa op til 22""" og Spandvidden 

 til 154""". Lignende kjæmpemæssige Exemplarer er ogsaa 

 undersøgte af Hansen fra det kariske Hav. 



Legemets Form (se Pl. XII, Fig. 3) er idethele ual- 

 mindelig kraftig og robust og retfærdiggjor fuldkommen 

 den for Arten valgte Benævnelse „robustum". Navnlig 

 gjælder dette selve Kroppen (Fig. 3 a. 3 b), der er over- 

 ordentlig plumpt bygget og stærkt fortykket paa Midten. 

 Segmenterne er meget skarpt afsatte fra hinanden og har 

 de bagre Kanter tydeligt fremspringende saavel oventil som 

 nedentil, hvorved Conturerne, naar Dyret sees fra Siden 

 (Fig. 3 a), faar et noget saugtakket Udseende. Sidefort- 

 satserne er korte og tykke, næsten kølleformige, og kun 

 adskilte ved meget smale, spaltlbrmige Mellemrum. Paa 

 sin ovre Side er de. ligesom Kropssegmenterne, rue af yderst 

 smaa mikroskopiske Pigge. Hovedsegmentet er af meget 

 betydelig Størrelse, selv kjendelig længere end de 3 følgende 



roughened by small microscopieal spines. Ocular tubercle 

 extremely small, lobiform. Proboscis about same length as 

 the cephalic segment, directed obliquely downwards, drawn 

 out conically towards the point. Chelifori, straightly ex- 

 tended, about same length as the body; scape eonstricted 

 at the base, hand a little shorter than the scape, palm 

 short, triangular, beset at the extremity with spiniform 

 bristles ; fingers nearly twice as long, claw-shaped, almost 

 semi-circularly curvate. Palpi considerably shorter than 

 the chelifori, densely setous ; 2nd joint longest, the 3 suc- 

 ceeding ones diminishing _ successively in size ; last joint 

 very narrow. False legs slightly shorter than the body; 

 in the male densely beset with spiniform bristles; the 

 terminal portion considerably longer than the 5th joint, 

 marginal spines very small, terminal claw slender. Ambul- 

 atory legs more than 3 times longer than the body, robust 

 and only narrowing slightly towards the extremity ; coxal 

 joints relatively short and thick; femoral joint not much 

 tumefied; 2nd tibial joint more than twice as long as the 

 terminal division, propodal joint one half longer than the 

 tarsal joint and considerably narrower, linear, and without 

 distinet spines on the inner margin, terminal claw about 

 same lengtli as the tarsal joint, uniformly curved, and 

 pointed like an awl; auxiliary claws extremely small, 

 almost obsolete. The outer egg-masses globular, contain- 

 ing numerous ova. Length of the body reaehing 22""". 

 Extent 154'"'". 



Bemarks. This species is, at present, the only re- 

 presentative of the genus Boreonymphon; as neither among 

 the numerous Nymphon-species from the Challenger Ex- 

 pedition, described by Hoek, nor among those exotic forms 

 described by other naturalists have I found any approx- 

 imation to the type peculiar to the genus. It is therefore 

 somewhat difficult - to furnish a precise specific diagnosis of 

 the present form, and the characters remarked upon, lrere. 

 are only temporarily plaeed together in an analogy to the 

 same characters in the Nymphon-species. 



Description. The usual length of the body appears 

 to be about 15""", with an extent 104"™; but the species 

 occasionally attains a considerably greater size, as the 

 length may rise to 22""" and the extent to 154™"'. Similar 

 gigantic specimens from the Kara Sea have also been 

 investigated by Hansen. 



The body (see Pl. XII, fig. 3) is, upon the whole, 

 uncommonly powerful and robust, and completely justifies 

 the designation „robustum : ' chosen for the species. This 

 applies especially to the trunk (fig. 3 a, 3 b), which is 

 exceedingly plumply built, and greatly tumefied at the 

 middle. The segments are very distinctly defined from 

 each other, with their posterior edges distinctly prominent 

 both above and below, which, when the animal is viewed 

 latterally, gives to the contours a somewhat serrated 

 appearance. The lateral processes are short and thick, 

 almost claviform, and are only separated by very narrow, 

 fissured intervals. On their upper sides, as well as on 

 the segments of the trunk, they are roughened by ex- 

 tremely minute microscopieal spines. The cephalic seg- 



