CHAP, 1X.] THE DEEP-SEA FAUNA. 463 
I have already pointed out that in reasoning upon 
the ground of identity of deep-sea forms with species 
hitherto found in Scandinavia, we must remember 
that the conditions of temperature of our southern 
seas at great depths—the conditions which appear to 
have the greatest influence upon the distribution of 
species-—correspond very clcsely with those of much 
shallower water in the Scandinavian seas; and that 
consequently the corresponding fauna in the northern 
regions was much earlier, and is still much better 
known. Mr. Gwyn Jeffreys lays great stress upon 
the greater numbers and the greater development 
in size and in prominent characters of sculpture and 
other ornament, of the Arctic examples of species 
common to our deep water. This is no doubt often 
the case, but we must admit that in many groups, 
and particularly among the mollusca, there is a 
tendency to dwarfing in deep water, and I should 
think it very possible that a species may attain 
a greater size and development in that region where 
its zone of special temperature conditions comes 
nearest the surface, most under the influence of 
air and light. 
Many of the mollusca from the deep water have 
hitherto been found only in the northern portions of 
the area examined, and are generally allied to northern 
forms. As examples of this group I may mention 
two interesting additions to the already famous Shet- 
land fauna, Buccinopsis striata, JEFFREYS (Fig. 76), 
a form somewhat allied to Buccinopsis dalei, which 
has long been one of the prizes of the Shetland seas, 
and Latirus albus, JEFFREYS (Fig. 77), known also 
from the coast of Norway. Cerithium granosum, S. 
