112 
Chwtonymphon macronyx, G. 0. Sat®, Pycnogonidea borealia 
& arctica, No. 36. 
Arts character. Legemet smsekrere end hos de 0 vrige 
Arter af Skegten, Kroppen smalt cylindrisk, oventil glat, 
med vidt adskilte Sidefortsatser. Hovedsegmentet omtrent 
saa langt sum de 2 ‘folgende Segmenter tilsammen, med 
tydelig markeret Hals; Pandedelen kun lidet udvidet. 
Halesegmentet cylindriskt, skjrevt opadrettet. 0ieknuden 
stserkt ophoiet og smal, ved Endcn forsynet med 2 diver- 
gerende Fremspring, Lindscrne af meget ulige Storrelse, 
det bagre Par betydelig mindre end det forreste og belig- 
gende hoierc op paa 0ieknuden. Snabelen af Hovedseg- 
mentets Lsengde, cylindrisk. Saxlemmerne forholdsvis svage 
og besatte med lange spredte Haar, Haanden kortere end 
Skaftet, Fingrene uses ten dobbelt saa lange som Palmen, 
sserdeles smale og stserkt krummede i Enden, med tynde 
og forlsengede Tsender i Inderkanten. Folerne spinkle, 
2det Led laengst, de 2 sidste Led tset liaarede, af ens 
Lsengde og tilsammen kengere end 3die. De falske Fodder 
kos Hannen stserkt forkengede, af et lignende Udseende 
som hos Ch. tenellum; Randtornerne smalt lancetformige, 
med stump S])ids og regelmsessigt saugtakkede Kanter. 
Gangfodderne omtrent 3 Gange Isengere end Legemet, 
meget spinkle og besatte med spredte Haar, Laarleddet 
hos Hunnen stserkt opsvulmet i det basale Parti, 2det 
Lsegled sserdeles smalt og omtrent dobbelt saa langt som 
det terminate Afsnit; Fodleddet over dobbelt saa langt 
som Tarsalleddet og kings Inderkanten forsynet med en 
tset og regelmsessig Rad af tynde Torner; Endekloen ual- 
mindelig stserkt forlienget, neppe kortere end Fodleddet, 
leformig tilskjmrpet ; Bikloerne yderst smaa og rudimentaere. 
De ydre iEgmasser kugleformige, med faa og store JEg, 
ofte tilstede i dobbelt Antal paa enhver af de falske 
Fodder. Legemets Lsengde 6 1 / 2 ”™; Spandvidde 36’"”'. 
Bemserkninger. Af alle Arter synes denne mest at 
afvige fra den typiske Form, Ch. hirtipes; men jeg lean 
dog ikke et 0ieblik betsenke mig paa at henfore den til 
samme Slsegtstype. Den eieudommelige Bygning af Sax- 
lemmerne, ligesom ogsaa Forholdet af de 2 ydre Led 
af Fodderne og den tydelige, skjondt vistnok mindre 
udprsegede Laaddenhed af Lemmerne, stempler den som 
en segte Chsetonymphon. Fra de ovrige Ai’ter er den let 
kjendelig ved sin forholdsvis meget spinkle Kropsform og 
ved den ualmindelige Lsengde af Endekloen paa Gangfod- 
derne, hvilken sidste Character har givet Anledning til 
Artsbensevnelsen. 
Beskrivelse. Lsengden af de storste Exemplarer gaar 
op til med en Spandvidde af 36 mm , altsaa omtrent 
som hos Ch. tenellum. 
Legemets Form (se PI. XII, Fig. 2) maa, i Sammen- 
ligning med samme hos de Ovrige Arter af Slaegten, kaldes 
sserdeles spinkel, skjondt den i denne Henseende ikke kan 
maale sig med Here Arter af Slsegten Nymphon. Selve 
Kroppen (Fig. 2 a, 2 b) er af smal cylindrisk Form og 
har Sidefortsatserne af betydelig Lsengde samt skilte ved 
brede Mellemrum. Ryggen er glat, uden den ssedvanlige 
Chwtonymphon macronyx. G. 0. Sars, Pycnogonidea borealia 
& arctica, No. 36. 
Specific Characters. Body slimmer than in the 
other species of the genus, trunk narrow-cylindric, smooth 
above, with the lateral-processes widely apart. Cephalic 
segment about as long as the 2 following segments taken 
together, with distinctly defined neck; frontal part but 
slightly expanded. Caudal segment cylindric, pointed ob- 
liquely upwards. Oculiferous tubercle exceedingly elevated 
and narrow, furnished at the extremity with 2 diverging pro- 
jections, the lenses very unequal in size, the posterior pair 
much smaller than the anterior, and placed higher up the 
tubercle. Proboscis the length of the cephalic segment, 
cylindric. Chelifori comparatively feeble and beset with 
long, scattered hairs, hand shorter than scape, fingers 
almost twice as long as palm, exceedingly narrow and 
sharply curved at the extremity, with thin and elongated 
teeth on the inner edge. Palpi slender. 2nd joint longest, 
the 2 last joints densely hairy, of equal length, and. 
taken together, longer than the 3rd. False legs ,in 
the male very much elongated, similar in appearance to 
those in Ch. tenellum; marginal spines narrow-lanceolate, 
with obtuse point and regularly serrated edges. Ambulatory 
legs about 3 times longer than body, very slender, and 
beset with scattered hairs, femoral joint in the female 
much swollen in the basal part, 2nd tibial joint exceed- 
ingly narrow, and about twice as long as the terminal sec- 
tion; propodal joint more than twice as long as the tarsal 
joint, and furnished on the inner edge with a dense and 
regular series of slender spines; terminal claw remarkably 
elongate, hardly shorter than the propodal joint, falciformly 
sharpened; auxiliary claws exceedingly small and rudi- 
mentary. Outer egg-masses globular, with few and large 
ova, often present in double number on each of the false 
legs. Length of body 6 1 //™; extent 36’"”'. 
Remarks. Of all the species this would seem to 
deviate most from the typical form, Ch. hirtipes; but I 
do not feel the slighest hesitation in referring it to the 
same generic type. The peculiar structure of the chel- 
ifori, as also the relations of the 2 outer joints of the 
legs, and the distinct, though certainly less prominent 
setous character of the limbs, show it to be a true 
Chsetonymphon. From the other species it is easily re- 
cognized, by its relatively very slender body and the 
remarkable length of the terminal claw on the ambul- 
atory legs, which latter character has suggested the specific 
designation. 
Description. The length of the largest specimens 
reaches 6 1 / 2 ’"’", the extent 36”"”, about the same therefore 
as in Ch. tenellum. 
The body (see PI. XII. fig. 2), compared with that 
of the other species of the genus must be termed ex- 
ceedingly slender, though in that respect it cannot com- 
pare with several species of the genus Nymphon. The 
trunk itself (fig. 2 a, 2 b) is narrow-cylindric in form, and 
has the lateral processes of considerable length and separ- 
ated by wide intervals. The back is smooth, without the 
