105 



som Piggene paa et sammenrullet Pindsvin (derai' Arts- 

 benævnelsen). 



Integumenterne er særdeles haarde og laste, skjøndt 

 noget gjennemsigtige og uden nogen tydeligt udpræget 

 Skulptur eller Haarbesætning. 



Hovedet er noget nedtrykt og har Panderanden i 

 Midten temmelig stærkt udrandét, saa at Sidehjørnerne 

 træder frem som afrundede Lapper, der delvis dækker 2det 

 Par Føleres Basalled. Enhver af disse Lapper gaar nedad 

 ml i et skarpt tandformigt Fremspring. Oventil er Hove- 

 det forsynet med 8 tornformige Fortsatser, hvoraf de 2 

 staar over og noget foran Øinene. medens de øvrige 6 dan- 

 ner en buet Tværrad over den bagerste Del af Hovedet. 



Iste frie Forkropssegment har Sidedelene udviklede 

 paa en lignende Maade som hos de 2 foregaaende Arter 

 til skjævt fortilrettede Lapper. Det har en regelmæssig 

 Tværrad af 8 spidse Torner. Ethvert af de 2 følgende 

 Segmenter viser en fuldkommen lignende Bevæbning. 4de 

 Segment er betydelig baade hengere og bredere end de 

 øvrige og har 2 Tværrader af spidse Torner. De 3 fol- 

 gende Segmenter aftager hurtigt i Brede bagtil og har 

 hvert en enkelt Tværrad af Torner samt tilspidsede og til 

 Siderne stærkt udstaaende Epimerer. 



Bagkroppen, der omtrent indtager l / 4 af Totallæng- 

 den. bestaar tilsyneladende kun af 2 Segmenter, idet det 

 2det er ufuldstændigt begrændset fra Endesegmentet. Iste 

 Segment er meget lidet og har en Tværrad af Torner, 

 som dog her er mindre end paa Forkropssegmenterne. 

 Endepartiet, der altsaa ogsaa omfatter det hos de 2 fore- 

 gaaende Arter tydeligt begrændsede 2det Segment, viser 

 til hver Side 2 stærke triangulære og noget bagudkrum- 

 mede Fortsatser og har oventil 4 parvis stillede, ligeledes 

 bagudkrummede Torner, hvorpaa følger en dobbelt Rad af 

 en Del noget mindre saadanne. Enden er ikke som hos 

 de 2 foregaaende Arter simpelt tilspidset, men viser i Mid- 

 ten en tydelig Udrandning begrændset til hver Side af et 

 kort tandformigt Fremspring. 



Øinene er meget smau. cirkelrunde og udstaaende til 

 Siderne, med mørkt Pigment. 



Iste Par Følere (Fig. 25) er omtrent af Hovedets 

 Længde og viser en lignende Bygning som hos de 2 fore- 

 gaaende Arter, dog med den Forskjel, at Svøben her er 

 meget smal, lineær og kun forsynet med 3 Sandsevedhæng 

 nær Spidsen. 



2det Par Følere (se Fig. 23 og 24) er vistnok i For- 

 hold til Iste Par kraftigt udviklede. men dog paa langt 

 nær ikke som hos de 2 foregaaende Arter, idet deres 

 Længde i fuldt udstrakt Tilstand er kjendelig mindre end 

 Totallængden. Basalafsnittet, som ogsaa her egentlig dan- 

 nes af 2 Led, er kort og tykt og gaar ved Enden paa den 



Den norske Nordhavsexpedition. G. O. S:ir>: Crustacea. 



everywhere arnied. and that bristle out on all sides, like 

 the quills of a rolled-up porcupine (hence the specific de- 

 signation). 



The integunieiits are exceedingly hard and firm, 

 though somewhat translucent, and have no perceptibly pro- 

 minent sculpture or covering of hair. 



The head is slightly depréssed, with the frontal 

 margin considerably emarginate in the middle, causing the 

 lateral corners to protend as rounded lobes, that partly 

 cover the basal joint of the 2nd pair of antennæ. Each 

 of tliese lobes juts out below as a ii acutelv deutiform pro- 

 jection. Above, the head is furnished with 8 spiniform 

 projections, of which 2 are placed above and a little an- 

 terior to the eves. whereas the remaining ti constitute an 

 arcuate transverse series, above the posterior part of the 

 head. 



The Ist free segment has the lateral parts developed 

 in a manner precisely similar to those in the preceding 

 species, viz. as oblique, anteriorly directed lobes. It has 

 a regular transverse series of 8 acute spines. Each of 

 the 2 succeeding segments exhibits a perfectly similar 

 armature. The 4th segment is a good deal longer and 

 broader than the others, and has 2 transverse series of 

 acute spines. The 3 succeeding segments diminish rapidlv 

 in breadth posteriorly, and have each of them a single 

 transverse series of spines, together with pointed epimera, 

 projecting very considerably toward the sides. 



The posterior division of the body. measuring about 

 one-fourth of the total length, consists apparently of but 2 

 segments, the 2nd segment being imperfectly separated 

 from the terminal one. The Ist segment is very small. 

 and has a transverse series of spines. which. however, are 

 smaller than those on the segments belonging to the an- 

 terior division. The terminal portion, comprising also ac- 

 cordingky the 2nd segment — distinctly defined in the 2 pre- 

 ceding species — exhibits on either side 2 strong triangular. 

 and somewhat posteriorly curving projections. and has. 

 above, 4 pairs of likewise posteriorly curving spines. to 

 which succeeds a double series of similar but smaller ones. 

 The extremity is not. as in the 2 preceding species. simple 

 pointed. hut exhibits in the middle a distinct emargina- 

 tion, bounded on either side by a short dentiform pro- 

 jection. 



The eves. laterally protruding. are very small, cir- 

 cular in shape, and furnished with a dark pigment. 



The Ist pair of antennæ (fig. 25) are about of the 

 same length as the head. and in structure similar to those 

 in the 2 preceding species, saving. however, that the flag- 

 ellum is very slender, linear, and provided with onlj '■'< 

 sensory appendices, in close proximity to the point. 



The 2nd pair of antennæ (figs. 23, 24) are. indeed, 

 as compared with the Ist pair, powerfully developed, by 

 no means, however. to the same extent as in the 2 pre- 

 ceding species. their length, when fully extended, being 

 perceptibly less than that of the body. The basal section, 

 which here, too, strictly, consists of 2 joints, is short and 



14 



