Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 436 MOLLUSCA : BRYOZOA. FIG. 666. Fresh-water Polyzoa or Bryozoa, natural size, and magnified. 1-6, Plumatella arethusa, Hyatt; 11-14, P. ,, Hyatt. (From Observations on Polyzoa, by Alpheus Hyatt.)

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