SUN AND HARVEST OF THE SEA—SCHMITT 313 
PLatse 8 
Urrrr: Sample of a chiefly herbivorous plankton community, largely copepods, 
the copepod Oalanus finmarchicus predominating, with some O. hyperboreus 
and Huchaeta norvegica, and the euphausid shrimp, 7'hysanoessa, together 
with several carnivorous forms—the glass worms, Sagitta elegans, the 
pelagic worm, Tomopteris, and two small jellyfish, Aglantha. From a yer- 
tical haul from 200-0 meters. X 1.5. 
Lower: Sample of zooplankton consisting almost wholly of comb-jellies, the 
ectenophore Plewrobrachia pileus, with an admixture of barnacle larvae, 
Balanus, in the so-called free-swimming nauplius stage, taken in a vertical 
haul in 40-0 meters over Brown’s Bank. X 1.5. 
(Both photographs from Bigelow, courtesy U. S. Fish and Wildlife Service.) 
PLATE 9 
Urrre: Sample of zooplankton dominated by juveniles of the amphipod Huthe- 
misto, a yery voracious devourer of copepods and in turn the food of larger 
earnivores. A surface haul from the south slope of Georges Bank. X 9. 
Lower: Sample of zooplankton consisting almost exclusively of the large copepod, 
Calanus finmarchicus, the most important of the small herbivores of the 
North Atlantic area. This is a portion of the most productive catch of 
Calanus yet made in the Gulf of Maine, a haul from which an estimated 
2,500,000 copepods weer taken off Cape Cod from 40-0 meters. X 9. 
(Both photographs from Bigelow, courtesy of U. S. Fish and Wildlife Service.) 
PLATE 10 
Food strainers of certain plankton-feeding fish and whales. 
. Portion of branchial sieve of menhaden, Brevoortia tyrannus. X 25. 
. Portion of branchial sieve of herring, Clupea harengus. X 25. 
Portion of branchial sieve of mackerel, Scomber scombrus. X 25. 
. Portion of marginal fringe of baleen plate of pollock whale, Balaen- 
optera borealis, from Gulf of Maine. Natural size. 
. Portion of marginal fringe of baleen plate of finback whale, Balaen- 
optera borealis, from Gulf of St. Lawrence. Natural size. 
(From Bigelow, courtesy U. 8. Fish and Wildlife Service.) 
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