i43 



ens Lrengde og at Endekloen er forholdsvis betydelig stærkere 

 forlænget. 



Hos det levende Dyr er saavel Legemet som Lem- 

 nierne af en intensiv tagstensrod Farve. Denne Farve 

 forsvinder dug meget hurtigt paa de i Spiritus opbevarede 

 Exemplarer, hvis Legeme derfor ogsaa bliver mere gjen- 

 nemsigtigt, saa at flere af de indre Dele mere eller mindre 

 tvdeligt skinner igjennem Integumenterne. Sees Legemet 

 fra Bagsiden (Fig. 2 b), bemærkes saaledes med stor Tyde- 

 lighed den hele Buggangliekjæde tilligemed de fra samme 

 udgaaende Hovednerver. Som hos Slægten Ascorhynchus, 

 bestaar denne af 5 vel adskilte Ganglier, hvoraf dog de 2 

 sidste er forbundne med saa korte Commissurer, at de 

 begge synes at tilhore Kroppens næstsidste Segment. 



Forekomst. Af denne characteristiske Form blev 

 under Xordhavs-Expeditionen 7 Exemplarer indsamlede, 

 alle fuldvoxne og næsten af ens Storrelse. Exemplarerne 

 toges paa 3 • forskjellige, temmelig vidt adskilte Stationer. 

 Af disse ligger den Iste (Stat. 31) udenfor Storeggen, den 

 2den (Stat. 137) i Havet Y af Lofoten, og den 3die (Stat. 

 312) NV af Beeren Eiland; Dybden fra 417 til 658 Favne. 

 Alle 3 Stationer tilhører den kolde Area. 



Udbredning. Arten er i den nyere Tid observeret 

 at' forskjellige Naturforskere og paa flere vidt adskilte Loka- 

 liteter, saaledes udenfor Nordamerikas Østkyst (Wilson), 

 i Færo — Shetlands-Renden (Hoek) og i det kariske Hav 

 (Hansen). Skjondt den ved Nordamerikas Østkyst ifølge 

 Wilson er observeret saa langt Syd som mellem den 38te 

 og 4Ude Bredegrad, er den dog utvivlsomt. ligesom fore- 

 gaaende Art, at anse for en ægte arktisk Form. 



r J?illæ S -. 



Bidrag til Pycnogonideernes Systematik. 



Undei Udarbeidelsen af denne Afhandling har det 

 mere og mere stillet sig for mig som onskeligt at faa gjort 

 et Forsog paa at foretage en mere conseqvent gjennemfort 

 systematisk Inddeling af de talrige hidtil kjendte Pycno- 

 gonideer. Da det synes, at alle Forskere for Tiden er 

 enige i, at disse Dyr hverken kan henføres til Crustaceerne 

 eller Arachniderne, men maa danne en Classe for sig. 

 kan man heller ikke hengere lade sig noie med at for- 

 dele de forskjellige Slægter paa forskjellige Familier, men 

 maa ogsaa se om muligt at faa grupperet Familierne 

 under større Afdelinger, eller Ordener. At et saadant 

 Forsog hidtil ikke er gjort, har sin naturlige Grrund deri, 



2 last joints (see rig. 2 f) are equal in length, and that 

 the terminal claw is, relatively, considerably more elon- 

 gated. 



In the living animal, the body, as weQ as the limbs. 

 has an intense briek-red colour. This colour disappears, 

 however, very rapidly t in the specimens preserved in 

 alcohol, their bodies therefore beeome more transparent, 

 so that several of the internal organs appear more or 

 less distinctly visible through the integuments. If the 

 body is viewed from the veiitral side (fig. 2 b) there may 

 thus be observed witli great distinctness. the entire ventral 

 ganglial chain as well as the chief nerves issuing from 

 the same. As in the genus Ascorhynchus, it consists of 

 5, well separated ganglia, of which the 2 last are, how- 

 ever, connected by so short commissures tliat they both 

 appear to pertain to the penultimate segment of the 

 trunk. 



Occurrenee. Of this characteristic form 7 specimens 

 were collected during the North Atlantic Expedition, all 

 f u 1 1 y grown and nearly equal in size. The specimens were 

 tåken at 3 different, pretty widely separated stations. Of 

 these the Ist (Stat. 31) lies outside the Storeggen bank. 

 the 2nd (Stat 137) in the ocean W of Lofoten, and the 

 3rd (Stat. 312) N, W of Beeren Island; depth from 417 

 to b'58 fathoms. All 3 stations pertain to the cold ana. 



Distribution. The species has, in later times, been 

 observed by several naturalists aud in several well se- 

 parated localities; thus, off the East Coast of North America 

 (Wilson), iu the Faroe-— Shetland Channel (Hoek) and in 

 the Kara Sea (Hansen). Although it has been, according 

 to Wilson, observed on the East Coast of North America 

 as far south as between the 38th and 40th parallels of 

 latitude; it must vet, indubitably, like the preceding species. 

 be regarded as a genuine Arctic form. 



Appendix. 



Contribution to the systematic piassification of the 

 Pycnogonids. 



In the preparation of this Memoir, tlie desirability 



of making a more logicallv instituted systematic arrange- 

 ment of the numerous, hitherto known Pycnogonids. lias 

 obtruded itself more and more strongly upon me. As it 

 appears that all naturalists are at present unanimous in 

 considering that those animals can neither be referred to 

 the Crustaceans nor the Araclinideans, but must form a 

 class by themselves, we cannot, either. be satisfied longer 

 with distributing the different genera over different families, 

 but must also endeavour, if possible, to group the families 

 in larger divisions, or orders. That such an attempt has 

 not been made, hitherto, arises, naturally, from the fact, 



