Naar den norske Nordhavsexpeditions ,mollusker* 
først nu kan faa sin afslutning, har dette sin grund i at 
andre gjøremaal saa stærkt har optaget min tid og tvunget 
mig at udsætte fra aar til andet med tilendebringelsen af 
arbeidet. 
Vistnok har samlingerne ligget bestemte og ordnede, 
men til en ny kritisk gjennemgaaelse af især de mindre 
arter, vil ikke længer mine øine gjøre mig fuld tjeneste, 
jeg har derfor formaaet min nevø, konservator James A. 
Grieg, at være min medarbeider i dette afsluttende arbeide. 
Bergen å april 1901. 
Herman Friele. 
That the ‘Mollusca’ of the Norwegian North Atlantic 
Expedition has only now been brought to a conclusion, is 
accounted for by the fact that other duties have oceupied 
,me and obliged me to defer the conclusion of my work 
from year to year. 
The collections, it is true, have long been determined 
and arranged, but my eyes will no longer serve me com- 
pletely for a new critical study of the species, especially 
the smaller ones. I have therefore prevailed on my nephew, 
Curator James A. Grieg, to be my collaborator in this 
concluding labour. 
Bergen. April, 1901. 
Herman Friele. 
Første bind af Nordhavsexpeditionens mollusker om- 
handler buccinidw, andet bind slegten bela samt nogle dels 
sjeldnere, dels for videnskaben nye arter. I dette bind 
gives en faunistisk oversigt over samtlige paa expeditionen 
tagne arter med oplysninger om deres horizontale og ver- 
tikale udbredelse. 
Angaaende udbredelsen maa vi gjøre opmærksom paa 
at mange forfattere ikke angiver, hvorvidt de har havt 
levende eller døde exemplarer for sig. Vi er derfor ved 
flere leiligheder i tvil om den horizontale eller den verti- 
kale udbredelse er saa nøiagtig som ønskeligt, thi det er 
ikke til dyrlevningernes udbredelse, men til det levende 
dyrs at interessen særlig knytter sig. Flere nordiske arter 
har saaledes vistnok faaet en altfor stor horizontal udbre- 
delse; andre former staar derimod angivet med dybder, 
som neppe kan gjælde levende exemplarer. Naar vi i det 
Den norske Nordhaysexpedition: H. Friele & J. A. Grieg. 
The first volume of the Mollusca of the North At- 
lantic Expedition treats of the Buccmidæ, and the second 
volume of the genus Bela, and some species that are either 
rare or new to science. In this volume, a faunistic survey 
is given of all the species taken during the expedition, 
with information respecting their horizontal and vertical 
distribution. 
With regard to the distribution, we must point out 
that many authors do not state whether their specimens 
were living or dead. On several occasions, therefore, we 
are in doubt as to whether the horizontal or the vertical 
distribution is as exact as could be desired; for it is not 
to the distribution of animal remains, but to that of the 
living animal, that special interest attaches. ‘To several 
Scandinavian species, far too wide a horizontal distribution 
has thus certainly been assigned, while on the other hand, 
other forms are given with depths that can scarcely apply 
Mollusea III. 
