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Note: — Classes which are entirely extinct are
represented hy name only ; those which consist
of minute or microscopic forms have, the repre-
sentative enclosed in a circle. The approximate
degree of enlargement or reduction is indicated
by the small figures near each picture.
The Phyla and Classes of Animals Ar-
ranged to show their Supposed Relation-
Copyright, 19011, by W. P. Hay.
SMITHSONIAN INSTITUTION LIBRARIES
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