98 



31. Nymphon megalops, G. 0. Sårs. 



(Pl. X. Fig. 



-g)- 



Nymphon megalops, Prodrom. descript. Oust & Pycnog. 

 etc. No. 7. 

 — — Gr. O. Sårs, Pycnogonidea borealia & 



arctica, No. 31. 



Artseharacter. Meget Hg foregaaende Art, men 

 Ryggen glat. uden dorsale Fremspring. Øieknuden meget 

 stor og tyk, stump konisk, med ualmindelig stærkt ud- 

 viklede Lindser. Snabelen af Hovedsegmentets Længde, 

 cylindrisk. Saxlemmerne smaa. noget lig samme hos fore- 

 gaaende Art, men med Haanden forholdsvis lidt større og 

 Fingrene kortere end Palmen, den bevægelige med et tyde- 

 ligt Indtryk fortil ved Basis. Folerne noget kraftigere end 

 hus foregaaende Art. 'idet Led længst, sidste aflangt ovalt, 

 kortere end næstsidste. De falske Fodder ikke meget 

 længere end Legemet, 5te Led kortere end Endedelen ; 

 Randtornerne forholdsvis smaa, rundtakkede i Kanterne. 

 Gangfødderne stærkt forlængede, omtrent 5 Gange længere 

 end Legemet, temmelig kraftigt byggede, 2det Lægled mere 

 end 4 Gange længere end det terminale Afsnit. Tarsalled- 

 det og Fodleddet omtrent af ens Længde, men noget 

 spinklere end hos foregaaende Art, det sidste med omtrent 

 6 Torner i det ydre Parti af lnderkanten; Endekloen for- 

 holdsvis kort, neppe halvt saa lang som Fodleddet; Bikløerne 

 vel udviklede, omtrent '/ 3 saa lange som Endekloen. Lege- 

 mets Længde 13"""; Spandvidde 140""». 



Bemærkninger. Denne Art staar særdeles nær fore- 

 gaaende, 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 er- 

 holdte Exemplarer er 13""", med en Spandvidde af 140""", 

 og denne Art opnaar saaledes en endnu betydeligere Stør- 

 relse end foregaaende. 



Kropsformen er (se Pl. X, Fig. 3) idethele tem- 

 melig lig samme hos foregaaende Art; dog maaske lidt 

 slankere. Selve Kroppen (Fig. 3 a, o 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 pyrainideformig. og lige opadrettet; forfra eller 

 bagfra seet (Fig. 3 e), viser Enden sig noget afstumpet, 



31. Nymphon megalops, G. 0. Sårs. 



(Pl. X, fig. 



-g)- 



Nymphon megalops, G. O. Sårs, Prodromus descript. Crust. 

 & Pycnog. etc. No. 7. 



G. O. Sårs, Pycnogonidea borealia & 

 arctica, No. 31. 



Speeiflc Characters. Very like the preceding species, 

 hut the back smooth, without dorsal projections. Oculiferous 

 tuhercle very large and thick, obtusely conical. with the 

 lenses remarkably well developed. Proboscis same length 

 as the cephalic segment, cylindric. Chelifori small, some- 

 what 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 stranger 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 soniewhat more stender than in the preced- 

 ing 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 charac- 

 teristic of that form. Moreover the oculiferous tubercle 

 is appreciably larger, and the lenses remarkably strang 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 tåken together. and has a dis- 

 tinctly 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 ex- 

 ceedingly large and thick, almost pyramidal, and directed 

 straight upwards; viewed anteriorly or posteriorly (fig. 3 e). 



