35 



at en detailleret Beskrivelse af samme bliver ganske over- 

 flødig. 



Det samme gjælder ogsaa Bagkroppens Svommeved- 

 hæng og de ydre Halevedhæng. 



Det midterste Halevedhæng viser ligeledes en meget 

 lignende Form. men skiller sig ved noiere Undersogelse 

 derved, at Spidsen ikke viser nogen Udrandning i Midten. 

 hvorimod den her er noget udbuet og til hver Side bevæbnet 

 med 3 meget smaa. men dog noget ulige udviklede Torner. 



Farven er i levende Tilstand hvidagtig. med den for- 

 reste Del af Rygskjoldet og Spidsen af Bagkroppen svagt 

 rødligt pigmentere!;. Munddelene og Basis af Fodderne er 

 noget mere intenst rødfarvede. 



Længden af det største erholdte Exemplar er 65 

 men ialmindelighed er Størrelsen af fuldt udviklede Indi- 

 vider betydelig mindre. 



Udvikling. Ogsaa hos denne Art er de under Hun- 

 nens Bagkrop fæstede Æg af paafaldende Størrelse og der- 

 for faa i Antal. Ved Dissection af samme har jeg kunnet 

 overbevise mig om. at ogsaa her Ungen forlader Ægget i 

 fuldt udviklet Tilstand, uden at gjennemgaa nogen postem- 

 bryonal Metamorphose. 



Forekomst og Udbredning. Arten er forst opdaget 

 under den Østerrigsk-Ungarn^ke Xordpolexpedition i Havet 

 omkring Frantz Josephs Land og er beskrevet og afbildet 

 af Heller i ovenanførte Skrift som en Art af Slægten Hip- 

 polyte. 



Under vor Expedition har vi tåget den paa ikke mindre 

 end ln forskjellige Stationer, hvoraf de allerfleste tilhorer 

 den kolde Area. og fra et Dyb af 350 — 1100 Favne. 



Dens for Tiden bekj endte geographiske Udbredning 

 strækker sig heretter fra den 63de til den 82de Bredegrad 

 og fra circa 2° Y. L. til 70° 0. L. og rimeligvis endnu 

 villere mod Øst. 



At den ligesom foregaaende Art maa ansees som en 

 ægte arktisk Form. fremgaar tilstrækkeligt af de ovenfor 

 givne Data. 



Fam. Ephyridæ. 



• ii-n. H^inenodora, G. O. Sårs. 1 s 7 7 . 



Prodromus descriptioms Crust. etc. 



Slægtscharacteristik. Legemet næsten trindt. ikke 

 sammentrykt fra Siderne. Integumenterne overordentlig 

 tynde og boielige. næsten membranose. Rygskjoldet fortil 

 i Midten kjolet og forsynet med et sammentrykt Pandehorn. 



hibited by the said parts in the preceding spedes, that a 

 detailed description may be held as wholly superfluous. 



The same remark applies. too, to the pleopoda. as 

 also to the outer caudal appendages. 



The telson hkewise exhibits a very similar form. but 

 differs. on closer examination, by reason of the point hav- 

 ing no emargination in the middle; here, however. it is 

 slightly curved. and on either side armed with 3 exceedingly 

 small, but somewhat .unequally developed spines. 



Cohiir, in a living state, whitish, the anterior part 

 of the carapax and the point of the abdomen being however 

 faintly tinged with reddish pigment. The oral appendages 

 and the base of the legs are somewhat more intensely red- 

 coloured. 



Length of the largest specimen obtained 65"""; but 

 as a rule thé size of full-grown individuals is considerably 

 less. 



Development. — In this species, too, the ova attached 

 beneath the abdomen of the female are remarkably large, 

 and therefore but few in number. By dissection, I have 

 convinced myself that the young of this animal also leave 

 the egg in a fully developed state, and accordingly do not 

 pass through any postemhryonal metamorpihosis. 



Qccurrence and Distribution. — The species was 

 first discovered on the Austrio-Hungarian North Pole Expe- 

 dition. in the open sea, a short distance off Frantz Joseph's 

 Land. and has since been described and figured by Heller 

 in the aforecited work, as a species of the genus Hippolyte. 



On our Expedition, we obtained the species at not 

 less than 10 different Stations, by far the greater part 

 of wkich belong to the cold area, and from a depth of 

 350—1100 fathoms. 



Hence, the geographical distribution of the species. 

 as known up to the present time, ranges from the 63rd 

 to the 82nd parallel of latitude, and from about long. 2° 

 W. to long. 70° E.. nay probably still farther east. 



That the animal must, in common with the foregoing 

 species, be regarded as a true Arctic form, is manifest from 

 the data aiven above. 



Fam. Ephyridæ. 



Gen. riyrnenoclora, G. O. Sårs. 1877. 



Prodromus descriptionis Crust. etc. 



Generie Character. — Body almost round, not eom- 

 pressed from the sides. Integuments exceechngly thin and 

 flexibile. almost membranaceous. Carapax keeled in the 

 middle anteriorly. and furnished with a compressed rostrum. 



