121 



Amniothea fibulifera, Dohrn. Die PantopodeD des Golfes 



von Neapel. p. 141, Tab. IV. Fig. 1—22. 

 Amniothea echhiata. Hoek, Archives de Zool. expériment. 

 Vol. IX. p. 508, Pl. XXV. Fig. 14—16. 



G. 0. Sårs, Pycnogonidea borealia & 

 arctica, No. 38. 



Artseharacter. Legemet tykt og massivt, noget ned- 

 trykt, 2det Kropssegment vel adskilt saavel fra Hovedseg- 

 mentet som det følgende Segment; de 2 sidste sammen- 

 voxne. Pandedelens Sidehjorner udtrukne til koniske, for- 

 tilrettede Fremspring. Sidefortsatserne tykke, næsten sam- 

 menstødende, hver ved Enden oventil forsynet med 2 ens 

 udviklede pigformige Fortsatser endende med en stiv Borste. 

 Øieknuden noget fortilrettet. næsten cylindrisk, Spidsen af- 

 stumpet, med et kort mediant Fremspring; Lindserne nær 

 Enden. Snabelen mere end halvt saa lang som det øvrige 

 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 

 kugleformig. Følerne 8-leddede. temmelig tynde, 2det Led 

 længere end 4de. dette sidste kortere end Endedelen. 

 Gangfodderne neppe dobbelt saa lange som Legemet, kraf- 

 tigt hyggede og delvis besatte med Pigge; de 2 første 

 Hofteled hos Hannen hvert med 4 parvis ordnede pigfor- 

 mige Fortsatser. Laarleddets ydre Hjørne koniskt frem- 

 springende, Fodleddet næsten jevnt bredt, stærkt krummet 

 og bevæbnet ved Basis i Inderkanten med 3 stærke Torner; 

 Endekloen omtrent halvt saa lang som Fodleddet. Bikløerne 

 vel udviklede, af Kloens halve Længde. Farven gulagtig. 

 Legemets Længde 2"""; Spandvidde 7"'"'. 



Bemærkninger. At denne Form er Hodge's Achelia 

 echhiata, anser jeg for sikkert, og rimeligvis hører ogsaa 

 lians Amniothea brevipes herhen som repræsenterende det 

 endnu ikke fuldt udviklede Dyr. Ligeledes kan jeg ikke 

 tvivle paa, at Dohrns A. fibulifera er identisk med den 

 nordiske Form. hvad ogsaa Hoek antager. I Begyndelsen 

 var jeg ogsaa tilbøielig til at henføre den nordamerikanske 

 Form. A. spinosa (Stimpson) til denne Art, men finder 

 dog. at domme etter den af Wilson givne Beskrivelse og 

 Figur, at der kan være Grund til at holde begge Former 

 indtil videre ud fra hinanden. Arten er let kjendelig ved 

 sine. især hos Hannen, stærkt piggede Fødder. 



Beskrivelse. Længden af Legemet hos fuldt udvik- 

 lede Individer af begge Kjøn overstiger neppe 2 mm , og den 

 største Spandvidde er omtrent 7""\ 



Legemets Form (se Pl. XIII, Fig. 1 og 1 a) er 

 ualmindelig undersætsig og Føddeme kortere end hos nogen 

 af de i det foregaaende omtalte Former, med Undtagelse 

 af Slægten Pi/cnogonum. Selve Kroppen (Fig. 1 b. 1 c. 

 1 d) er forholdsvis meget tyk og har Sidefortsatserne saa 

 tæt sammentrængte, at det midtre Parti "af Legemet faar 

 Udseende af en oval Skive, hvorfra Lemmerne udstraaler. 

 Midt over Kroppen gaar 2 vel markerede Tva'rsuturer, 

 hvorved 2det Segment er tydeligt afgrændset saavel fra 



Den norske Nordhavsexpedition. G. 0. Sårs: Pycnogonidea. 



Amniothea fibulifera, Dohrn. Die Pantopoden des Golfes 



von Neapel. p. 141. Pl. IV. figs. 1—22. 

 Amniothea echinata, Hoek. Archives de Zool. experiment. 

 Vol. IX, p. 508. Pl. XXV. figs. 14-16. 



G. 0. .Sårs. Pycnogonidea borealia & 

 arctica, No. 38. 



Specific Charactere. 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 terniinating in a still' 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 au;ain as the rest of the body. 

 Chelifori scercely 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""". Extent 7""". 



Bemarke. That this form is Hodge's Achelia echi- 

 nata I consider to be certain, and probably his Amniothea 

 brevipes also belongs to it, as representative of the not 

 yet tully 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. hut 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 easilv 

 recognizable by its spinous legs, especially in the male. 



Description. The length of the body. in fullv devel- 

 oped individuals of both sexes. scarcely exceeds 2""" and 

 the greatest extent is about 7 



The body (see Pl. XIII, fig. 1 and 1 ai is uncom- 

 monly stout, and the legs shorter than in any of the forms 

 wc have piwiously mentioned with exception of the genus 

 /'//' iioi/oiiioii. The trunk itself (fig. 1 b. 1 c. 1 d) is re- 

 latively verv thick. and has the lateral processes so closely 

 crowded that the media] 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 



