13 
38. Boreophausia inermis, (Kroyer). 
Ogsaa for denne Form bar jeg vseret nodt til at op- 
stille en egen Slsegt, da den har vist sig at. vmre generisk 
forskjellig saavel fra Slaegten Thysanopoda som fra Slsegten 
Euphausia , hvortil jeg tidligere har hen fort den. To andre 
nordiske Euphausiider borer ind under samme Slaegtstype, 
nenilig Thysanopoda negleda Kroyer og Th. Baschn M. Sars, 
muligcns ogsaa Th. longicaudata Kroyer. 
Exemplarer af den her ombandlede ved Tore nordlige 
Kvster meget almindeligt forekommende Art toges under 
Expeditionen ved Jan Mayen og i Havet mellem denne 0 
°g Island. Den er forst beskrevet af Kroyer fra Gronland 
°g ogsaa noteret fra Spitsbergen og Nordamerikas 0stkyst, 
bvorfor den utvivlsomt er at betragte som en mgte arktisk 
Eorm. 
39. Thysanoessa ten era, G. 0. Sars. 
Oversigt over Norges Crustaceer I. 
Denne lille zirlige, af mig forst i Yarangerfjorden 
fnndno Art observeredes under Expeditionen paa 4 for- 
skjollige Stationer i dot aabne Hav mellem Norge og Jan 
Mayen. Alle Exemplarer erholdtes ved Hjselp af Over- 
fladenettet. 
Fam. Mysidse. 
40. Boreomysis tridens, G. 0. Sars. 
Exemplarer af denne Art toges under Expeditionens 
sidste Togt i Vestfjorden (Stat. 255) paa 341 Favnes Dyb. 
Eoruden i Yestfjoi'den, bvor jeg forst fandt den, er den 
bun observeret i Trondhj emsfjorden af Conservator Storm, 
bgeledes paa betydeligt Dyb. Gauske nylig har jeg ogsaa 
truffet den i Foldenfjord paa lignende Dyb. 
41. Boreomysis nobilis, G. 0. Sars, n. sp. 
Se lste Afsnit, pg. 54, PI. V, Fig. 22 — 28. 
38. Boreophausia inermis, (Kroyer). 
For this form, too, I have had to institute a separate 
genus, the animal having proved generically distinct alike 
from the genus Thysanopoda and the genus Euphausia, 
to the latter of which I had previously referred it. lwo 
other Northern Euphausiidans belong to the same generic 
type, viz. Thysanopoda negleda Kroyer and Th. Easchii 
M. Sars, possibly too Th. longicaudata Kroyer. 
Examples of the species treated of here, a very com- 
mon one off the northern shores of Norway, were taken 
on the Expedition at Jan Mayen and in the tract of ocean 
extending between that island and Iceland. The species 
was first described by Kroyer, from Greenland, and has 
also been recorded from Spitsbergen and the east coast of 
North America; hence, it must unquestionably be regarded 
as a true Arctic form. 
39. Thysanoessa tenera, G. 0. Sars. 
Oversigt over Norges Crustaceer I. 
This diminutive, graceful species, discovered by the 
author in the Varangerfjord, was met with on the Ex- 
pedition, at 4 different Stations, in the open sea, between 
Norway and Jan Mayen. All of the specimens were ob- 
tained in the surface-net. 
Fam. Mysidae. 
40. Boreomysis tridens, G. 0. Sars. 
Examples of this species were taken, on the last 
cruise of the Expedition, in the Vestfjord (Stat. 255), at a 
depth of 341 fathoms. Exclusive of the Vestfjord, where 
I first observed it, the animal has been taken m the 
Trondhjemfjord only, by Mr. Storm, also at a considerable 
depth. Quite recently I have also met with the species in 
the Foldenfjord, at similar depths. 
41. Boreomysis nobilis, G. 0. Sars, n. sp. 
See Part I, p. 54, PI. V, figs. 22—28. 
Findested. Stat. 362. 
Locality. — Stat. 362. 
