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oftest shatteret med større uregelmæssige Pletter eller Skjolde 

 af en mørkere lirun Couleur. 



Længden af de største Exemplarer er, maalt fra En- 

 den af 2det Par Foleres Blad til Spidsen af det midterste 

 Halevedhæng 130""", og den lier omhandlede Form staar 

 saaleiles neppe tilbage i Størrelse for nogen af de tidligere 

 bekjendte Arter af Slægten. 



Udvikling. De under Hunnernes Bagkrop fæstede 

 Æg er (se Fig. 2) forholdsvis af temmelig betydelig Stør- 

 relse, hvilket tør tyde hen paa, at Ungernes Udvikling er 

 forbunden med en mindre fuldstændig Metamorphose end 

 hos de øvrige Crangonider. Hos ingen af de erholdte Ex- 

 emplarer var dog Æggenes Udvikling saa vidt fremskreden. 

 at dette med Sikkerhed kunde eonstateres. 



Ganske unge Individer af kun 16 — 18 Mm.'s Længde 

 er af noget slankere Kropsform end fuldt udvoxede Dyr 

 og har Pandehornet forholdsvis større og de tornformige 

 Fortsatser paa Legemet skarpere fremtrædende. Saavel 

 paa Rygskjoldets som Bagkroppens Overflade tindes spredte 

 og temmelig lange Haar. 



Forekomst og Levevis. I vore Have er denne Art 

 en fegte Dybvandsform, som ne2)pe nogensinde her træffes 

 lor i en Dybde af omkring 100 Favne, medens den gaar 

 ned lige til 459 F. og maaske endnu dybere. Derimod 

 synes den ved Kamtschatka at leve paa betydelig grundere 

 Vand, da den lier. itolge Tilesius fanges i stor Mængde nær 

 Kysten af de Indfodte. der anvender den til Næring. Lige- 

 som de øvrige Crangonider er den en udpræget Bundlbrm. 

 hvilket tydeligt nok fremgaar af dens hele Organisation og 

 navnlig af de stærkt incrusterede Integumenter. der giver 

 Legemet en betydelig specitisk Vægt og neppe tillader Dyret 

 at gjøre ret lange Udflugter i Våndet. De af os indsamlede 

 Exemplarer var ogsaa kun lidet livlige i sine Bevægelser 

 og holdt sig fordetmeste rolige paa Bunden af de Kar, 

 hvori de opbevaredes for nærmere Observation. 



Udbredning. Saavel de til (i rund for Tilesius's som 

 Owen's Beskrivelser liggende Exemplarer var fra Kamt- 

 schatka. som tidligere var det eneste bekjendte Findested 

 for nærværende Art. 



I et nylig af Dr. Stuxberg udgivet interessant Skrift 

 betitlet: "Evertebratfaunaen i Sibiriens Ishav" anføres imid- 

 lertid denne Art at v;ere randet under Nordenskjolds Ex- 

 pedition 1876 i det kariske Hav paa et Par Lokaliteter. ■ 



Under vor Expedition har vi tåget den paa li for- 

 skjellige Stationer, hvoraf de 4 tilhører Havet omkring 

 Spitsbergen, medens de 2 øvrige ligger vidt adskilte, den 

 ene ved Jan Mayen, den anden i Havet udenfor vor Vestkyst. 



Dens for Tiden bekjendte geografiske Udbredningsfelt 

 strækker sig heretter fra Kamtschatka og Behringsstrædet 

 vestlig idetmindste til 8° V. L. og fra den 63de til den 

 80de Bredegrad. 



Den norske Nordhavsexpedition. G. O. Sårs: Crustacea. 



a rule relieved with cmnparatively large irregular spots or 

 patches. of a darker brown colour. 



The length of the largest specimens. measured from 

 the extremity of the scale of the 2nd pair of antennæ to 

 the tip of the telson. reaches 130"""; and hence the form 

 here treated of can. as regards size. hardly yield precedence 

 to any of the previously known species of the genus. 



Development. — The eggs attached beneath the 

 ahdomen of the females (see fig. 2) are comparatively large, 

 a circumstance from which, perliaps. we may infer. that 

 the development of the young animals is attended with a 

 less complete metamorphosis than in any of the other Oran- 

 i/mi/ihi'. In none, however, of the specimens collected bad 

 the ova attained a stage of development that would admit 

 of connrming the assumption with certaiuty. 



Very young animals, not exceeding 16 — 1 8 millimetres 

 in length. have the body of a somewhat more slender form 

 than full-grown individuals. the rostrum, too. relatively larger. 

 and the spiniform prolations on the body more sharply 

 defined. Both on the carapax and the surface of the ah- 

 domen are seen scattered hairs of considerable length. 



Ocourrence and Habits. — In the North Atlantic, this 

 species is a true deep-sea form. rarely, if ever. met with at a 

 depthless than about lOOfathoms, though elsewbere it descends 

 to 459 fathoms. and possibly still deeper. On the other hand. 

 off the coast of Kamtschatka it would appear to inhabit much 

 shallower water, being there, according .to Tilesius. tåken 

 near the coast in great abundance by the natives, who 

 consume the animal as food. Like all other Orangonidæ, 

 it is a well-marked bottom-form, a fact sufficiently apparent 

 from its whole organization. and in particular from the 

 thickly incrusted integuments, which give to the body a 

 considerable specific weight. and can hardly admit of the 

 animal travelling far through the water. Kor were the 

 specimens we collected particulary brisk in their movements, 

 keeping as they did during the greater part of the time 

 quietly at the bottom of the vessels in which they were 

 preserved for closer examination. 



Distribution. — The specimens to which the descrip- 

 tions both of Tilesius and of Owen refer. were from off 

 Kamtschatka. formerly the only known habitat of the 

 present species. 



According to an interesting paper lately published by 

 Dr. Stuxberg. bearing title: - - "Evertebratfaunaen i Sibi- 

 riens Ishav" (The Evertebrate Fauna in the Polar Seas of 

 Siberia), this species would appear to have been tåken on 

 Nordenskjold's Expedition in 1876, from the Kara Sea, 

 in one or two localities. 



During the course of our Expedition. we obtained 

 the animal at 6 different Stations. 4 in the sea surrounding 

 Spitzbergen. the 2 others lying wide apart, one at Jan 

 Mayen, the other off the western shores of Norway. 



Hence. the geographical distribution of the species :i- 

 yet known. ranges in a westerly direction from Kamtschatka 

 and Behring's Strait at least to long. 8° W., and from the 

 63rd to the 80th parallel of latitude. 



4 



