Notes on Luvarus imperialis Raf., a fish new to the fauna of Norway. 15 
These examinations do not profess to be a complete analysis 
of the intestinal contents. As the process of digestion was so far 
advanced, it is with some uncertainty that the partially digested 
residue can lead to an absolutely correct conclusion with regard 
to the composition of the original nourishment, the absorbed stuffs 
being unknown. Of albuminous food, however, there would not 
seem to have been any large quantity in the original nourishment. 
The time, at which the species occurred on our coast, implies 
that it belongs to the warm pelagic community of the Atiantic; 
just as the largest number of Mola mola and Lampris pelagicus 
are caught in the autumn (Sept., Oct., Nov.) when the Atlantic 
plankton is most abundant in our waters and among the plankton 
salpae are at times found in large quantities. Also Luvarus pro- 
bably belongs to that group of our Atlantic guests that come to 
our coasts in the wake of the plankton, which is brought northward 
by the warm current. AE. 
The salpae form quite an important part of the plankton in 
the warm water; this fact points to the probability that they form 
the principal nourishment of some species of fish. As already 
mentioned, it is reasonable to conclude that the alimentary canal 
in such species must differ from that of rapacious fish and those 
which live on — physiologically speaking — animal plankton. 
There is reason to believe that not only Luvarus, but also Mola 
mola is to some extent obliged to feed on salpae; it appears that 
also the latter has a very long intestine’) and has been observed 
at places where there simultaneously have been enormous quanti- 
ties of salpae.?) This species is known to feed on medusa. (C 9i- 
lett 1905). The moderate elongation of the intestine of Mola is 
perhaps therefore rather coordinated with the low nutritive value 
of this food. 
*) Vide fig. 507 in Hjorth & Murray: The Depths of the Ocean. 
London 1912. 
*) Hjorth & Murray, p. 119. 
