121 
Ammothea fibulifera, Dohrn, Die Pantopoden des Golfes 
von Neapel, p. 141. Tab. IV, Fig. 1 22. 
Ammothea echinata, Hoek. Archives de Zool. experiment. 
Vol. IX, p. 508, PL XXV, Fig. 14—16. 
Gr. 0. Sars, Pvcnogonidea borealia & 
arctica, No. 38. 
Artscharacter. Legemet tykt og massivt, noget nc d- 
trykt, 2det Kropssegment vel adskilt saavel fi’a Hovedseg- 
mentet (som det folgende Segment; de 2 sidste sammen- 
voxne. Pandedelens Sidehjorner udtrukne til koniske, toi- 
tilrettede Fremspring. Sidefortsatserne tykke, nsesten sam- 
menstodende, liver ved Eudcn oventil forsynct med 2 ens 
udviklede pigformige Fortsatser endende med en stiv Borste. 
0ieknuden noget fortilrettet, nsesten cylindrisk. Spidsen af- 
stumpet. med et kort mediant Fremspring; Lindserne user 
Enden. Snabelen mere end halvt saa lang som det pvrige 
Legeme. Saxlemmerne neppe halvt saa lange som Snabe- 
len, Skaftet oventil ved Enden gaaende ud i et i Spidsen 
tvedelt og med 2 Pigge forsynet Fremspring, Endedelen 
kngleformig. Folerne 8-leddede, temmelig tynde, 2det Led 
lsengere end 4de, dette sidste kortere end Endedelen. 
Gaiigfodderne neppe dobbelt saa lange som Legemet, kraf- 
tigt byggede og delvis besatte med Pigge; de 2 forste 
Hofteled hos Hannen hvert med 4 parvis ordnede pigfor- 
mige Fortsatser. Laarleddets ydre Hjsrae koniskt frem- 
springende, Fodleddet nsesten jevnt bredt. stserkt krummet 
og bevsebnet ved Basis i Inderkanten med 3 staerke Torner; 
Endekloen omtrent halvt saa lang som Fodleddet, Bikloerne 
vel udviklede, af Kloens halve Lsengde. Farven gulagtig. 
Legemets Lsengde 2 mm ; Spandvidde l’" m . 
Bemserkninger. At denne Form er Hodge s Achelia 
echinata , anser jeg for sikkert, og rimeligvis borer ogsaa 
l mns Ammothea brevipes herhen som reprsesenterende det 
endnu ikke fuldt udviklede Dyr. Ligeledes kan jeg ikke 
tvivle paa, at Dohrn’s A. fibulifera er identisk med den 
nordiske Form, hvad ogsaa Hoek antager. I Begyndelsen 
var jeg ogsaa tilboielig til at henfore den nordamerikanske 
Form. A. spinosa (Stimpson) til denne Art, men finder 
dog, at dennne efter den af Wilson givne Beskrivelse og 
Fkur, at der lean vaire Grund til at liolde begge Foimei 
indtil videre ud fra hinanden. Arten er let kjendelig \ed 
sine, isser hos Hannen, stserkt piggede Fodder. 
Beskrivelse. Lamgden af Legemet hos fuldt udvik- 
lede In divider af begge Kjon overstiger neppe 2""". og den 
storste Spandvidde er omtrent l mm . 
Legemets Form (se PL XIII, Fig. 1 og 1 a) er 
ualmindelig underssetsig og Fodderne kortere end hos nogen 
af de i det foregaaende omtalte Former, med Undtagelse 
af Slsegten Pycnogomm. Selve Kroppen (Fig. 1 b. 1 c. 
1 d) er forholdsvis meget tyk og bar Sidefortsatserne saa 
tmt sammentrsengte, at det midtre Parti af Legemet faai 
Udseende af en oval Skive, hvorfra Lemmerne udstraaler. 
Midt over Kroppen • gaar 2 vel markerede Tvsersuturer, 
hvorved 2det Segment er tydeligt afgrsendset saavel fra 
Den norske Nordhavsexpedition. G. O. Sars: Pycnogonidea. 
Ammothea fibulifera, Dohrn, Die Pantopoden des Golfes 
von Neapel, p. 141, PL II . figs. 1 — 22. 
Ammothea echinata, Hoek. Archives de Zool. experiment. 
Vol. IX, p. 508, Pl. XXV, figs. 14—16. 
— G. 0. Sars, Pvcnogonidea borealia & 
arctica, No. 38. 
Specific Characters. Body thick and massive, some- 
what depressed, 2nd truncal segment well separated from 
the cephalic segment as well as from the succeeding one; 
the two last segments coalesced. The lateral corners 
of the frontal part drawn out to conical prominences 
projected forwards. Lateral processes thick, almost con- 
tiguous, each furnished at the end, above, with two equally 
developed spiniform processes terminating in a stiff bristle. 
Ocular tubercle somewhat anteriorly directed, almost cyl- 
indrical, the point blunted, with a short medial promin- 
ence; the lenses placed near the extremity. Proboscis 
more than half as long again as the rest of the body. 
Chelifori scercelv half the length of the proboscis, the 
scape at the tip, above, passing into a bifurcated projection 
at the point furnished with 2 spines, the terminal portion 
globular in form. Palpi 8-jointed, rather slender, 2nd joint 
longer than 4th and the last-named shorter than the terminal 
part. Ambulatory legs scarcely twice as long as the body, 
powerfully built and partly beset with spines; the 2 first 
coxal joints, in the male, each with two spiniform processes 
arranged in pairs, the outer corner of the femoral joint 
conically projectant, propodal joint almost uniform in 
breadth, strongly bent, and, at the base, furnished on the 
inner margin with 3 strong spines; terminal claw about 
half the length of the propodal joint, auxiliary claws well 
developed and half the length of the claws. Colour yel- 
lowish. Length of the body 2 mn . Extent l mm . 
Remarks. That this form is Hodge’s Achelia echi- 
nata I consider to be certain, and probably his Ammothea 
brevipes also belongs to it, as representative of the not 
yet fully developed animal. Neither can I doubt that 
Dohrn’s A. fibulifera is identical with the northern form, 
which Hoek has also supposed. At first I was also dis- 
posed to assign the North American form, A. spinosa, 
(Stimpson) to this species, lint think, however, when judged 
by the description and illustration given by Wilson, that 
there may be good reason to keep both forms separate 
from each other for the present. The species is easily 
recognizable by its spinous legs, especially in the male. 
Description. The length of the body, in fully devel- 
oped individuals of both sexes, scarcely exceeds 2 mm and 
the greatest extent is about 7 mm . 
The body (see PL XIII, fig. 1 and 1 a) is uncom- 
monly stout, and the legs shorter than in any of the forms 
we have' previously mentioned with exception of the genus 
Pycnogonum. The trunk itself (fig. 1 b. 1 c. 1 d) is re- 
latively very thick, and has the lateral processes so closely 
crowded that the medial portion of the body aquires the 
appearance of an oval disc from which the limbs radiate. 
Across the middle of the body two well-defined trans- 
versal sutures pass, causing the 2nd segment to be dis- 
16 
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