In 1851, Leidy described from the Schuylkill River near Philadelphia, the interesting Bryozoan, Pectinatella magnifica. Since then, it has been recorded from a number of other localities in America and Europe. The exact distribution, however (for America, at least) is still only partially known. Brown1 has recently published a careful study of the biology of this species; and the present writer has studied, since 1928, the distribution of this species in Iowa, as well as its periodicity of abundance.
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Geiser, S. W.
"The Distribution Of Pectinatella Magnifica Leidy In The United States,"
Field and Laboratory: Vol. 2
Available at: https://scholar.smu.edu/fieldandlab/vol2/iss2/5