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98
31. Nymphon megalops, G. O. Sars.
(Pl. X, Fig. a-g).
Nymphon megalops, Prodroin. descript. Crust. & Pycnog.
etc. No. 7.
— — G. O. Sars. Pycnogonidea borealia &
arctica, No. 31.
Artscharacter. Meget lig foregaaende Art, men
Hyggen glat. uden dorsale Fremspring. Øieknuden meget
stor og tyk, stump konisk, med ualmindelig stærkt
udviklede Lindser. Snabelen af Hovedsegmentets Længde,
cylindrisk. Saxlemmerne smaa. noget lig samme hos
foregaaende Art, men med Haanden forholdsvis lidt større og
Fingrene kortere end Palmen, den bevægelige med et
tydeligt Indtryk fortil ved Basis. Folerne noget kraftigere end
hos foregaaende Art. 2det Led længst, sidste aflangt ovalt,
kortere end næstsidste. De falske Fødder ikke meget
længere end Legemet, 5te Led kortere end Endedelen;
Randtornerne forholdsvis smaa, rundtakkede i Kanterne.
Gangfodderne stærkt forlængede, omtrent 5 Gange længere
end Legemet, temmelig kraftigt byggede, 2det Lægled mere
end 4 Gange længere end det terminale Afsnit,
Tarsalleddet og Fodleddet omtrent af ens Længde, men noget
spinklere end hos foregaaende Art, det sidste med omtrent
6 Torner i det ydre Parti af Inderkanten; Endekloen
forholdsvis kort. neppe halvt saa lang som Fodleddet; Bikloerne
vel udviklede, omtrent saa lange som Endekloen.
Legemets Længde 13"""; Spandvidde 140’"".
Bemærkninger. Denne Art staar særdeles nær
foregaaende, men er dog meget let kjendelig fra samme ved
den fuldstændige Mangel af de for hin Art saa
charac-teristiske dorsale Fremspring. Ligeledes er Øieknuden
kjendelig større og Lindserne af ualmindelig Udvikling,
hvad der har givet Anledning til Artsbenævnelsen.
Beskrivelse. Legemets Længde hos de største
erholdte Exemplarer er 13™, med en Spandvidde af 14(1""",
og denne Art opnaar saaledes en endnu betydeligere
Størrelse end foregaaende.
Kropsformen er (se Pl. X, Fig. 3) idethele
temmelig lig samme hos foregaaende Art; dog maaske lidt
slankere. Selve Kroppen (Fig. 3 a, j b) er oventil ganske
glat, uden Spor af nogen dorsale Fremspring, og har
Side-fortsatserne af betydelig Størrelse samt skilte ved tydelige,
skjøndt ikke meget brede Mellemrum. Hovedsegmentet er
omtrent saa langt som de 3 følgende Segmenter tilsammen
og har en tydeligt markeret Hals, der er kjendelig smalere
end hos foregaaende Art; Pandedelen synes forholdsvis
lidt stærkere udvidet end hos denne Art.
Øieknuden (se Fig 3 a, 3 b) er særdeles stor og
tyk, næsten pyramideformig, og lige opadrettet; forfra eller
bagfra seet (Fig. 3 e), viser Enden sig noget afstumpet,
31. Nymphon megalops, G. O Sars.
(Pl. X, Hg. :s, a—g).
Nymphon megalops, G. O. Sars, Prodromus descript. Crust.
& Pycnog. etc. No. 7.
G. O. Sars, Pycnogonidea borealia &
arctica, No. 31.
Specific Characters. Very like the preceding species,
but the back smooth, without dorsal projections. Oculiferous
tubercle very large and thick, obtusely conical, with the
lenses remarkably well developed. Proboscis same length
as the cephalic segment, cylindric. Chelifori small,
somewhat resembling those of the preceding species but with
the hand, relatively, a little larger and the fingers shorter
than the palm, the mobile one having anteriorly at the base
a distinct indenture. Palpi somewhat stronger than in the
preceding species, 2nd joint the longest, last one oblongo-oval,
shorter than the penultimate one. False legs not much
longer than the body, 5th joint shorter than the terminal
part; marginal spines comparatively small, obtusely serrate
on the edges. Ambulatory legs greatly elongated, about
5 times longer than the body, rather powerful in structure,
2nd tibial joint more than 4 times longer than the terminal
section, the tarsal and propodal joints about equal in
length, but somewhat more slender than in the
preceding species, the latter with about 6 spines on the distal
part of the inner edge; terminal claw comparatively short,
hardly half the length of the propodal joint; auxiliary
claws well developed, about one-third as long as the
terminal claw. Length of body 13"""; extent 140""".
Remarks. This form approximates very closely indeed
the preceding species, but is, however, readily recognized
by the total absence of the dorsal projections so
characteristic of that form. Moreover the oculiferous tubercle
is appreciably larger, and the lenses remarkably strong in
development, a feature which has suggested the specific
designation.
Description. The body, in the largest examples
obtained, has a length of 13’"™, with an extent of 140""";
hence this species attains a still more considerable size
than the preceding one.
The form of the body (see Pl. X, fig. 3) is, on the
whole, very similar to that of the preceding species, but
possibly a little more slender. The trunk itselt (fig. 3 a,
3 b) is, superiorly, quite smooth, without a trace of any
dorsal projection, and has the lateral processes of considerable
size and separated from each other by distinct, though not
very wide intervals. The cephalic segment is about as long
as the 3 following segments taken together, and has a
distinctly defined neck, which is appreciably narrower than in
the preceding species; the frontal part would seem to be
relatively a little more expanded than in that form.
The oculiferous tubercle (see fig. 3 a, 3 b) is
exceedingly large and thick, almost pyramidal, and directed
straight upwards; viewed anteriorly or posteriorly (fig. 3 e).
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