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To 
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Sources of Marine Food. (To face page 368.) 
Plate 68. 
Longitudinal Section, Letter M. 
rganisms of the longitudinal section designated “ Letter M," the totals, together 
?r data descriptive of the course, being tabulated on page 361 of the text of this 
same organisms are recorded under each station, A to D ; their relative abun- 
:ace, mid-depth, and bottom is indicated upon left-hand margin of the diagram, 
he following plates (69-71) the Copepoda are a hundred times multiplied as com- 
he other organisms, but all the others are platted to the same scale except that 
f the quantity of Melosira is used. 
