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39
Pcillene hi sp/da, Stimpson, Invertebrata ot’ Grand Manan,
p. 37 (adult).
PseudopaUene hispida, "Wilson, Synopsis oi’ the Pycnogonida
of New England, p. 10, Pl. III, fig. 1 a—c (adult).
Idem, Rep. U. S. Comm. Fish and
Fisheries VI, p. 478, Pl. II, fig. 9.
Pseuclopallene discoidea, Wilson, Synopsis of the Pycnogonida
of New England, p. 12, Pl. III, fig. 3, a—c (jun.).
— Idem, Rep. U. S. Comm. Fish and
Fisheries VI, p. 479, Pl. Il, fig. 10.
PseudopaUene intermedia, Hansen, Kara Havets
Pycnogonider, p. 21, Tab. XIX, fig. 2 a—1 (adult. & jun.).
PseudopaUene circidaris, G. O. Sars. Pycnog. borealia et
arctica, No. 9.
Artscharacteristik. Legemet særdeles plumpt og
undersætsigt, med Sidefortsatserne næsten sammenstødende; de
2 midterste Kropssegmenter oventil med en Længderad af høie
pigformige Fortsatser. Hovedsegmentet neppe saa langt som
de 3 følgende tilsammen, Halsen særdeles kort, næsten obsolet.
Saxlemmerne forholdsvis korte, Skaftet cylindriskt, meel
stærke pigformige Fortsatser ved Enden, Saxen neppe
længere end Skaftet, triangulær, den ubevægelige Finger med
en enkelt afrundet Knude i Midten af Inderkanten; den
bevægelige Finger glat. De falske Fødder forholdsvis korte,
de ydre Led besatte med simple, uregelmæssigt ordnede
Torner i Inderkanten Gangtødderne korte og robuste,
neppe mere end dobbelt saa lange som Legemet, og
forsynede, især langs Ydersiden, med stærke pigformige
Fortsatser, fint cilierede i Kanterne og bærende en stiv Børste
i Spidsen; Fodleddet stærkt krummet og bevæbnet i
Inderkanten med omkring 8—10 stærke Torner; Endekloen
kortere end Fodleddet. Farven gulbrun. Legemets Længde
31/ynra; Spand vidde 19mm.
Bemærkninger. Der kan efter min Mening
ingensomhelst Tvivl være om, at Goodsir’s Pallene circidaris er
identisk med Krøyer’s P. discoidea, og, da Goodsir’s
Afhandling er publiceret 3 Aar tidligere end Krøyer’s, maa
selvfølgelig det af førstnævnte Forsker foreslaaede Navn,
circu-laris, bibeholdes for Arten. Dr. Hansen har først paavist,
at de 2 Krøyerske Arter, P. intermedia og discoidea hører
sammen, clen første repræsenterende fuldt udviklede, den
anden yngre Individer; noget, hvis Rigtighed jeg ogsaa ved
egne Iagttagelser kan bekræfte. Den amerikanske" Form
P. hispida. synes heller ikke i nogen Henseende at skille
sig fra fuldvoxne Exemplarer af nærværende Art, ligesaalidt
som den af Wilson som PseudopaUene discoidea beskrevne
Fonn lader sig adskille fra yngre Individer (= Pallene
discoidea, Krøyer).
Beskrivelse. Legemets Længde er hos fuldt
udviklede individer omtrent 31/2mm, med en Spand vidde at 19mm.
Nogen bemærkelig Forskjel i Størrelsen hos de 2 Kjøn
findes ikke.
Formen er (se PI. III, Fig. 3) ualmindelig kort og
undersætsig, i hvilken Henseende denne Art noget minder
om Al-terne af Slægten Ammothea, Leach. Selve Kroppen
Pallene hispida, Stimpson, Invertebrata of Grand Manan,
p. 37 (adult).
PseudopaUene hispida, Wilson, Synopsis of the Pycnogonida
of New England, p. 10, Pl. III, fig. 1 a—e (adult).
— Idem, Rep. JJ. S. Comm. Fish and
Fisheries VI, p. 478, Pl. II, fig. 9.
PseudopaUene discoidea, Wilson, Synopsis of the Pycnogonida
of New England p. 12, Pl. Ill, fig. 3, a—c (jun.).
— Idem, Rep. U. S. Comm. Fish and
Fisheries VI? p. 479, Pl. II, fig. 10.
PseudopaUene intermedia, Hansen, Kara Havets
Pycnogonider, p. 21, Tab. XIX, fig. 2 a—1 (adult & jun).
PseudopaUene circidaris, G. O. Sars. Pycnog. borealia et
arctica, No. 9.
Specific Characters. Body exceedingly clumsy and
thickset, with lateral processes well-nigh contiguous; the 2
median segments of the body above with a longitudinal
series of prominent spiniform projections. Cephalic segment
hardly as long as the 3 succeeding ones taken together,
neck extremely short, almost absent. Chelifori
comparatively short, scape cylindric with strong spiniform
projections at the extremity, chela hardly longer than scape,
triangular, immobile finger with a single rounded
protuberance at the middle of the inner edge; mobile finger
smooth. False legs comparatively short, outer joints
beset with plain, irregularly disposed spines on the inner
margin. Ambulatory legs short and robust, scarcely more
than twice as long as body, and furnished, especially
along the outer side, with strong spiniform projections
delicately ciliated at the edges, and bearing a stiff bristle at
the point; propodal joint greatly curved, and armed on the
inner edge with about 8—10 strong spines; terminal claw
shorter than propodal joint. Colour a yellowish brown.
Length of body B1^""] extent 19mm.
Remarks. In my opinion, there can not be the
slightest doubt that Goodsir’s Patlene circidaris is
identical with Krøyer’s P. discoidea, and as Goodsir’s
Memoir appeared 3 years previous to Krøyer’s, the name
circidaris proposed by the former naturalist, must," as a
matter of course, be retained for the species. Dr. Hansen
was the first to point out that the 2 Krøyer species, P.
intermedia and P. discoidea are the same, the lormer
representing fully developed the latter immature individuals —
a fact borne out by ray own observations. The North
American form, P. hispida, does not seem to differ either
from adult specimens of the present species, and just as little
does the form described by Wilson under the name of
PseudopaUene discoidea permit itself to be distinguished from younger
specimens (= Pallene discoidea, Krøyer).
Description. The length of the body in fully
developed specimens is about 31/2""n, the extent about 19mm.
Any appreciable difference in size between the 2 sexes can
not be detected.
The form (see PI. Ill, fig. 3) is remarkably short and
thickset, in which respect this species calls somewhat to
mind the species of the genus Ammothea, Leach. The body
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