NO. 30 SMITHSONIAN EXPLORATIONS, I9Q12 HS 
from all these reservoirs and the streams supplying them, from the 
embryonic Gatun Lake, its adjacent swamps, and from the waters 
Fic. 80.—Rocky Island in Panama Bay, showing Frigate birds. Plank- 
ton collections were made near this spot. Photograph by Marsh. 
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Fic. 81.—Collecting Entomostraca in Black Swamp, Canal Zone. This locality 
will be covered by Gatun Lake. Photograph by Marsh, 
of the Chagres and Trinidad Rivers, as well as from the streams 
and pools of the southern slope, and in the harbors of Colon and 
