American Naturalist. Vol. VI. Pl. 4. 
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TWO FRUSTULES OF 
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AMPHIPLEURA PELLUCID® 
MAGNIFIED 1500 DIAMETERS. 
PHOTOGRAPHED BY 
DR. J. J. WOODWARD, U. S. ARMY; 
SEBUM. 
AT THE ARMY MEDICAL M USEU! 
Objective by WM. WALES, Fort Lee, N. J. 
