97 



Slægt, AstaciUa. Begge staar hinanden vistnok meget nær; 

 men det lader sig dog gjøre at opstille en Del distinctive 

 Characterer, der ialfald for Tiden vil kunne tillægges generisk 

 Værd. og jeg har derfor troet at burde holde disse 2 Slægter 

 ml fra hinanden. 



succeeding, viz. to the genus AstaciUa. Both do indeed 

 approximate very closely; hut a number of distinctive char- 

 acters can however be found that. leastways at present. 

 have warrantable generic value; and hence T have seen tit 

 to keep these 2 genera apart. 



20. Arcturus baffini. Sab. 



Pl. IX, Fig. 1— -21). 



20. Arcturus baffini, Sal). 



I Pl. IX. tigs. 1—21). 



Idothta baffini, Sabine, Appendix to l'arrv's Iste Voy. pg. ">0, Pl. I, Idothta baffini, Sabine, Appendix to Parry's First Vov. p. 50, Pl. I 



Fig. -I— ii. figs. 4—0. 



Arcturus tubtrculatus, Latreille i Cuvier's Regne animal, Vol. IV, pg. 1 39. Arcturus tuberculatus, Latreille, in Guvier's Regne animal, Vol. IV, p. 139. 



Arcturus baffini, Westwood, Trans. Entom. Sne. Lond., Vol. I. pg. 72. Arcturus baffini, Westwood, Trans. Entom. Sev. Lond., Vol. I. p. 72. 



Artscharacteristik. Legemet ovalt, loddent at' korte 

 og stive Haar, med en dobbelt Bad ai koniske, opadrettede 

 Fortsatser langs ad Ryggen. Epimererne paa de '■'< bagerste 

 Korkropssegmenter triangulært tilspidsede og stærkt udstaa- 

 ende til Siderne. Sidste Bagkropssegment bagtil koniskt 

 uddraget, med 2 triangulære Sidefortsatser ved Basis og 2 

 smaa Torner paa Midten af Rygfladen. Øinene store og 

 fremstaaende, af nyredannet Form og forsynede med mørkt 

 Pigment. Iste Par Poleres Svøbe forsynet med talrige 

 Sandsevedhæng. 2det Par Polere betydelig længere end 

 Legemet, med Svoben sammensat af <S Led. Farven lys 

 brungul. Legemets Lænede indtil 40""". 



Findesteder. Stat. 48, 359. 



Bemærkninger. Nærværende anselige Art er først 

 beskreven og afbildet af Sabine i Appendixet til Parry's 

 Iste Nordpolexpedition, men er senere, saåvidt mig bekjendt. 

 ikke underkastet nogen fornyet Undersøgelse, skjøndt den 

 flere Gange er gjenfunden og nævrit af mange forskjellige 

 Forfattere. Latreille"s Slægt Arcturus er utvivlsom grundet 

 paa denne Art. hvorfor ogsaa det oprindelige Slægtsnavn 

 her maa anvendes. Den lier omhandlede Art er saaledes 

 Typen for Slægten Arcturus og tillige for Familien Arc- 

 turidæ. 



Beskrivelse af Hunnen. Legemet er (se Pl. IX, 

 Fig. 1 og 2) næsten af cylindrisk Form, omtrent 7 Gange 

 længere end bredt og er overalt loddent af korte og stive 

 Haar. Dets Overflade er forøvrigt temmelig ujevn, idet 

 Segmenterne er skilte ved temmelig dybe Endsnøringer og 

 forsynede med afrundede Forhoiuinger og Fordybninger 

 samt med en Del symetriskt ordnede hoie koniske Fortsat- 

 ser, tier danner en dobbelt Række langs ad Ryggen. 



Integumenterne er stærkt incrusterede og viser overalt 

 en fint knudret eller granuleret Sculptur. 



Hovedet er omtrent af samme Brede som Længde, 

 fortil neppe afsmalnende og her næsten lige afskanret eller 

 i Midten ganske svagt udrandet. ( •ventil er det forsynet 



Den norske Nordhavsexpedition. <; (). Sårs: Crustrtcea. 



Specific Character. - Body everywhere clothed with 

 short and still hairs, and furnished along the back with 

 a double series of conical. upward - directed projections. 

 Epimera on the 3 posterior pedigerous segments triangularly 

 pointed, and prominently projecting at the sides. Last 

 abdominal segment conically produced posteriorly, with 2 

 triangular lateral projections at the base. and 2 small spines 

 in the middle of the dorsal surface. Eyes large and pro- 

 truding. reniform in shape, and provided with a dark pig- 

 ment. Flagellum of Ist pair of antenna' with numerous 

 sensory appendices. Second pair of antennæ considerablj 

 longer tban body. with flagellum composed of 8 joints. 

 Oolour a light brownish-yellow. Lengtb of body reach- 

 ing 40""". 



Locality. — Stats. 48, 359. 



Bemarks. — The present large species was first described 

 and tigured by Sabine. in the Appendix to Parrys First North 

 Pole Expedition, hut bas subsequently. so far as I am 

 aware, not been again submitted to any closer examina- 

 tion. though several times met with and recorded by varioiis 

 authors. Latreilles genus Arcturus is unquestionably founded 

 on this species: and hence the original generic designation 

 sbould be retained. The species treated of heie is accord- 

 ingly the type of the genus Arcturus. and likewise of the 

 family Arcturidæ, 



Description of the Female. — The body (see Pl. 

 IX. tigs. 1. 2) is almost cylindric in form. about 7 times 

 longer tban broad, and everywhere clothed with long and 

 stift" hairs. Its surface is. for the rest. rather uneven, the 

 segments being separated by rather deep instrictions, and 

 having rounded prominences and depressions, as also a 

 number of symmetrically arranged. high. conical projections. 

 constituting a double series along the back. 



The integuments are strongly incrusted. and exhibit 

 everywhere a minutely rugged, or granulous sculpturing. 



The head has about the same breadth as lengtb. tapering 

 scarcely at all anteriorly. where it is abruptly truncate, 

 or. in the middle. slightly emarginated. Above, it exhibits 



13 



