33 
Pallene brevirostris, G. 0. Sars, Pyenogonidea borealia et 
arctica, No. 7. 
Artscharacteristik. Kroppen noget underssetsig, mod 
Si defo l'tsatse r n e neppe laengere end Segmenternes Bredde. 
H o vedsegme nt et laengere end de ovrige Segmenter tilsammen, 
liaison temmolig tyk og ikke skarpt begrsendset fra Pande- 
delen ; Afstanden fra Gieknuden til Hovedsegmentets For- 
kant mindre eud fra samme til Halesegmentet. 0ieknuden 
temmelig lav, stumpt tilspidset. Snabelen omtrent halvt 
saa lang som Hovedsegmentet. Saxlemmevne meget korte, 
Haanden af Skaftets Lsengde, Fingrene kortere end Palraen. 
De falske Fodder bos Hunnen af Legemets Liengdo, hos 
Hannen en halv Gang til saa lange, sidste Led med 9 
pladeformige Torner. Gangfodderne omtrent 3 l /-> Gang 
lrengere end Kroppen, 2det Hofteled ikke dobbelt saa langt 
som de to avrige tilsammen ; 2det Lsegled omtrent 3 Gauge 
laengere end det terminate Afsnit (Tarsal- og Fodleddet) ; 
Fodleddet noget krummet, med 5 standee Torner i det ba- 
sale Parti af Inderkanten, Bikloerne noget kortere end 
Endekloen. Legemet gjennemsigtigt med brede, opakt hvide 
Tvaerbaand over Gangfodderne. Lsengden af Kroppen l'/aT, 
Spandvidde 1 \ mm . 
Bemaerkninger. Jeg kan ikke betvivle, at den bei 
omhandlede Form er den af Johnston forst beskrevne Art. 
Hvad den nordamerikanske Form, P. ewpusa, Wilson, an- 
gaar, saa er den allerede af Hoek og Hansen indentificeret 
med murvserende Art, og jeg finder heller ikke, at den af 
Wilson givne Beskrivelse og de af ham meddclte Figurer 
afviger saa meget, at der kan vaere Grund til at antage 
nogen specifisk Forskjel. Hvorvidt nogen af de 4 afDohrn 
opstillede middelhavske Arter lader sig hen lore til naervse- 
rende Art, svnes mig noget tvivlsomt. De 2 Arter P. 
spectrum og P. Tiberi synes at vaere de, der mest ligner 
vor Art, uden at jeg dog tor indentificere nogen af dem 
med samme. 
Beskrivelse. Legemets Lamgde hos fnldt udviklede 
Hunner overskrider neppe D/a"", og Spandvidden 11 , 
Hannerne er i Brgelen lidt mindre. 
Legemet er (se PI. HI, Fig. 1, 1 a og 1. b) forholds- 
vis noget undersaetsigt, navnlig i Sammenligning med t’ol- 
gendeArt, af cylindrisk Form og neppe afsmalnende bagtil. 
Den egentlige Ivrop er lain delt i 3 tydeligt begrsendsede 
Segmenter, idet de 2 sidste er fuldstamdig sammensmeltede 
med hinanden, uden at der er det mindste bpor ai nogen 
Sutur mellem begge at opdage. Fuldkommen clet samme 
er ogsaa Tilfeldet med folgende Art, og jeg bar Grund til at 
antage, at dette er en for samtlige Arter af nmmerende Slregt 
fielles Character, som kuu ikke har vaeret tilstr&kkelig paa- 
agtet af tidligere Forskere. Hovedsegmentet er af sserdeles 
betydelig Storrelse, selv kjendelig lamgere end de ovrige Seg- 
menter tilsammen, hvad der vsesentlig skyldes den standee 
Udvikling af det frontale Parti. Den foran Gieknuden lig- 
gende Del af dette Segment er nemlig over 2 , /-> Gang saa 
lang som den bagenfor samme liggende Del, og riser en 
tydeligt indknebet og temmelig lang cylindrisk Hals, der 
dog ganske successivt udvider sig til det stserkt forty kkede 
° Don norska Uordhavsexpedition. O. 0. Sars: Pycnogomdoa. 
Pallene brevirostris, G. 0. Sars. Pyenogonidea borealia et 
arctica, No. 7. 
Specific Character. Body somewhat short and stout, 
with the lateral processes scarcely longer than the segments are 
broad. Ohephalic segment exceeding in length that of the 
other segments taken together, neck rather thick and not 
sharply defined from the frontal part ; distance from the 
oculiferous tubercle to the anterior margin of the cephalic 
segment less than from the former to the caudal segment. 
Oculiferous 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 body, in the male half as long again, last 
joint with 9 lamellar spines. Ambulatory legs about d'/s 
times the length of the body, 2nd coxal joint not twice as 
long as the 2 others taken 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 hands 
across the ambulatory legs. Length of body extent 1 1 
Bemarks. I see no reason to doubt that the form 
here treated is the species first described by Johnston. 
As regards the North American form, P. empusa, "Wilson, that 
has been already mdentified by Hoek and Hansen with the 
present species ; nor does Wfilsou 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 lie those bearing the closest resem- 
blance to our species, although I would not venture to 
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 
1 1®"" • the males are, as a rule, somewhat smaller 
The body (see PI. HI. 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 
completelv coalesce without the slightest trace ol ha\ ing a 
suture. Precisely the same is the case with the following spe- 
cies, and I have reason to believe that this is a character 
common to all species of the present genus, but which has not 
been sufficiently regarded by earlier naturalists. The cephalic 
segment is especially of great size, being appreciably longer 
than all the rest taken together, which must chiefly he ascribed 
to the strong development of the frontal part. The part 
of this segment in front of the ocnliferus tubercle is more 
than 2 1 / 2 times the length of the part behind it, and exhi- 
bits a distinctly constricted and rather long cylindrical neck, 
which, however, expands quite gradually to the strongly tum- 
fied terminal part, from which the proboscis and the chelifori 
