33 



Pallene brevirostris, G. 0. Sårs, Pycnogonidea borealia et 

 arctica, No. 7. 



Artseharacteristik. Kroppen noget imdersætsig, med 

 Sidefortsatserne neppe længere end Segmenternes Bredde. 

 Hovedsegmentet længere end de øvrige Segmenter tilsammen, 

 Halsen temmelig tyk og ikke skarpt begrændset fraPande- 

 delen : Afstanden fra Øieknuden til Hovedsegmentets For- 

 kant mindre end fra samme til Halesegmentet, Øieknuden 

 temmelig lav. stumpt tilspidset. Snabelen omtrent halvt 

 saa lang sinn Hovedsegmentet. Saxlemmerne meget korte, 

 Haanden af Skaftets Længde, Fingrene kortere end Palmen. 

 De falske Fødder hos Hunnen af Legemets Længde,. hos 

 Hannen en halv Gang til saa lange, sidste Led med 9 

 pladeformige Torner. Ga"ngfødderne omtrent 3 1 ,,. Gang 

 længere end Kroppen, 2de1 Eofteled ikke dobbelt saa langt 

 som de to øvrige tilsammen ; 2detLægled omtrent 3 Gange 

 hengere end det terminale Afsnit (Tarsal- og Fodleddet); 

 Fodleddet noget krummet, med 5 stærke Torner i det ba- 

 sale Parti af Inderkanten, Bikløerne noget kortere end 

 Endekloen. Legemet gjennemsigtigt med brede. ..pakt hvide 



Tværbaand over Gangfødderne. Længden af Kroppen l 1 .■'._. 



Spandvidde 11 



Bemærkninger. Jeg kan ikke betvivle, at den her 

 omhandlede Form er den af Johnston forst beskrevne Art. 

 Hvad den nordamerikanske Funn. /'. empusa, Wilson, an- 

 gaar, saa er den allerede at Hoek og Hansen indentificeret 

 med nærværende Art. og jeg tinder heller ikke. at <\>'i\ af 

 Wilson givne Beskrivelse og de af ham meddelte Figurer 

 afviger saa meget, at der kan være Grund til at antage 

 nogen specifisk Forskjel. Hvorvidt nogen af de 4 afDohrn 

 opstillede middelhavske Arter lader sig henføre til nærvæ- 

 rende Art. synes mig noget tvivlsomt. De 2 Arter P. 

 spedrtøm og P. Tiberi synes at være de. der mest ligner 

 vor Art. 'uden at jeg dog tor indentificere nogen af dem 

 med samme. 



Beskrivelse. Legemets Længde hos fuldt udviklede 



Hunner overskrider neppe l 1 ..""". og Spaudvidden 11' ; 



Hannerne er i Ei gelen lidt mindre. 



Legemet er (se Pl. TIL Fig. 1. 1 a og 1 b) forholds- 

 vis noget undersætsigt, navnlig i Sammenligning med føl- 

 gende Art, af eylindrisk Form og neppe afsmalnende bagtil. 

 Den egentlige Krop er kun delt i 3 fcydeligt begrændsede 

 Segmenter, idet de 2 sidste er fuldstændig sammensmeltede 

 med hinanden. uden at der er det mindste Spor at nogen 

 Sutur niellem begge at opdage. Fuldkommen det samme 

 ei- ogsaa Tilfældet med følgende Art, og jeg har Grund til at 

 antage. at dett.- er en tur samtlige Arter af nærværende Slægt 

 fælles Character, sum kun ikke har været tilstrækkelig paa- 

 agtet af tidligere Forskere. Hovedsegmentet ei' af særdeles 

 betydelig Størrelse, selv kjendelig hengere end de øvrige Seg- 

 menter tilsammen, hvad der væsentlig skyldes den stærke 

 Ddvikling af det frontale Parti. Den foran Øieknuden lig- 

 gende Del af dette Segment er nemlig over -I",.. Gang saa 

 lang som den bagenfor samme liggende Del. og viser en 

 tydeligt indknebet og temmelig lang eylindrisk Hals. der 

 dog ganske suceessivt udvider sig til det stærkt fortykkede 



Den norske Nordhavsexpedition. G. 0. Sårs: Pycnogonidea. 



PdUene brevirostris, G. 0. Sårs. Pycnogonidea borealia et 



arctica, No. 7. 



Specifle Character. Body somewhat short and stout, 

 with the lateral processes scarcely longer than the segments are 

 broad. Chephalic segment exceeding in length that of the 

 other segments tåken together. neck rather thick and not 

 sharply defined from the frontal part; distance from the 

 oculiferous tubercle to the anterjor margin of the cephalic 

 segment less than from the former to the caudal segment. 

 Oculiterous tubercle rather low, obtusely pointed. Pro- 

 boscis about half as long as cephalic segment. Chelifori 

 exceedingly short, hand the length of the scape, fingers 

 shorter than palm. The false legs in the female the 

 length of the lindy, in the male half as long again. last 

 joint with 9 lamellar spines. Ambulatory legs about 3 1 ., 

 times the length of the body, -hul coxal joint not twice as 

 long as the 2 others tåken together ; 2nd tibial joint about 

 3 times as long as the terminal portion (tarsal joint and 

 propodal joint); propodal joint somewhat curved, with 5 

 strong spines in the basal part of the inner margin, the 

 auxiliary claws a trifle shorter than the terminal claw. 

 Body translucent. with broad opaque white transverse bands 

 across the ambulatory legs. Length of body F _.""". extent 11""". 



Bemarks. I see no reason to doubt that the form 

 heie treated is the species first described liv Johnston. 

 As regards the North American form. /'. empusa, Wilson, that 

 has been already indentified by Hoek and Hansen with the 

 present species; nor does Wilson's description. and the fig- 

 ures he has furnished. in my judgment. deviate sufficiently 

 to warrant our assuming any specific distinction. Whether 

 any of the 4 Mediterranean species established by Dohrn 

 admit of being referred to the present form. appears to 

 me somewhat doubtful. The 2 species P. spectrum and 

 P. Tiberi would seem to be those bearing the closest resein- 

 blance to our species. although I would not venture tu 

 identify either of them with it.. 



Description. The length of the body in fully deve- 

 loped females hardly exceeds l 1 /*""", and the extent hardly 

 11'"'"; the males are. as a rule, somewhat smaller 



The body (see Pl. III. figs. 1. 1 a and 1 b) is com- 

 paratively short and stout, particularly when compared with 

 the following species, has a cylindrical form and scarcely 

 tapers at all posteriorly. The body proper is divided into 

 only 3 distinctly defined segments, as the 2 terminal ones 

 completely coalesce without the slightest trace of having a 

 suture. Precisely the same is the case with the following spe- 

 cies. and 1 have reason to believe that this is a character 

 common to all species of the present genus, but which has not 

 been sufficiently regarded liv earlier naturalists. The cephalic 

 segment is especially of great size, being appreciably longer 

 than all the rest tåken together, which must chiefly be ascribed 

 to the strong development of the trontal part. The [tart 

 of this segment in front of the oculiferus tubercle is more 

 than 2 1 /* times the length of the part heltind it. and exhi- 

 1 >its a distinctly constricted and rather long cylindrical ueck, 

 which, however, expands quite gradually to the stronglytum- 

 fied terminal part. from which the proboscis and the chelifori 



