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& 
3 
EXPLANATION OF PLATES III AND IV 
All the figures were drawn with the aid of an Abbé camera lucida, and 
various combinations of lenses were used. The drawings have been reduced 
two-sevenths in reproduction. Figs. 1-4 were built up from consecutive sec- 
tions of a series, two sections each being used for figs. 1 and 2, and three sections 
each for figs. 3 and 4. This was necessitated by the fact that the archicarp 
rarely lies for any considerable portion of its length in the plane of one section. 
