REVIEWS AND BOOK NOTICES. 411 
action of its waves and 
currents, and filling up 
hollows by drifting about 
and distributing their ma- 
regard the Atlantic Ocean 
as covering a vast region 
of wide shallow valleys 
and undulating plains, 
with a few groups of vol- 
canic mountains, insignifi- 
cant both in height and 
extent, when we consider 
the enormous area of the 
ocean bed. 
The chapter on deep-sea 
i 
t 
i 
ever, that in the historical 
sketch of deep-sea dredg- 
ing, what had been done 
previous to British explo- 
rations, by Pourtalès un- 
der the auspices of the 
United States Coast Sur- 
vey is not fully stated. 
On page 231 of the fifth 
chapter it is remarked that 
“dredging operations have 
been conducted most suc- 
cessfully under Count 
Ray Sy Pourtalés, and it will be 
x N ; seen hereafter that his re- 
X aW X sults are a valuable com- 
A Sy as 7 plement and — 
Ah of our own.” And 
VY, page 277 it is said, “Tn 
pai: XY the year 1868 Count L. F. 
SS 3 de Pourtalés, one of the 
Fig. 110. Rhizocrinus Loffotensis. officers employed in the 
4, 
