1908] - Decapod Urustaceans. 295 
Their being found east of the North Cape is worthy of notice, 
because that locality used to be regarded as the dividing line 
between two zoologically sharply defined regions,!)--a purely arctic 
fauna eastwards, and the ordinary composite fauna westwards along 
the whole of the rest of the coast. Thus from these discoveries 
we see that the species has å fairly wide distribution throughout 
the Boreal-Arctic regions. 
Bathymetric Distribution: The littoral region is undoubtedly 
the characteristic habitat of this species. However when trawling 
for prawns in the Brevik Fiord in the autumn of 1898 (28th 
November—sth December), I found specimens at åa depth of 120 
meters which were both large and well developed and whose 
structure in no wise differed from those found in shallow water. In 
a few days we caught ås many as 20 individuals from a soft muddy 
bottom. 
Their appearance at such a depth is probably to be aseribed 
to the time of year when they were caught (the latter part of 
November and beginning of December), and Dr. FErrENBAUM'S 
researehes into the life-history of Crangon vulgaris on the German*) 
coast go far to confirm this assumption: since it appears from them 
that in the winter and early spring UC. vulgaris leaves its habitual 
abode in shallow coastal waters for greater depths where changes 
of temperature are less extreme. FEHren»Bavm does not however 
mention any depth-limit. 
The specimens found in deep water were far darker in colour 
(åa darkish brown) than specimens usually found in littoral regions, 
and had å yellowish- red eye-pigment like what we find in Ponto- 
philus and other deep-sea species. At a later date I have again 
found them at similar depths in other southern fiords [Fedde Fiord 
between Flekkefiord and Farsund] and curator GrizG has found 
them on the west coast of Norway [Vik in the Sogn Fiord] at å 
depth of nearly 100 meters. In the Christiania Fiord they were 
found some years ago by G. O. Sars at a depth of from 50 to 60 
1) Of. G. 0. Sars: Bidrag til Kundskaben om Norges Arktiske Fauna. 
I. Mollusea Regionis Arcticae Norvegiae. Kristiania 1878, pages 1—3. 
*) Dr. Ernst EHrenBaum: Zur Naturgeschichte von Orangon vulgaris 
Fapr.”.  Sonderbeilage zu den Mittheilungen fiir Kusten- und Hochseefischerei, 
Jahre. 1890. 
