152 
THREE CRUISES OF THE “ BLAKE.” 
Oceans, — the survivors perhaps of an abyssal fauna, which, 
thanks to the distributing agency of the equatorial currents, 
extended, in mesozoic times, over the whole floor of the equa- 
torial and a part of the temperate zones.’ 
1 Under favorable conditions, animals 
having a wide geographical and geolog- 
ical distribution have been found in prox- 
imity to continental masses. The “ Al- 
batross ” has dredged in deep water off 
Chesapeake Bay many deep-sea types 
first known from the European tertiaries, 
from the arctic and antarctic, from the 
shores of Europe and of South America, 
from the West Indies, and even from In- 
dia and the Pacific Ocean. 
