Abstract
Specimens of Paludicella articulata collected in the vicinity of Washington, D. C. had 2n=22, with a usual karyotype consisting of a relatively large submetacentric set, 4 metacentrics, and 6 subtelocentrics. A few specimens showed a subtelocentric replacing one member of a metacentric set. Hyperploid cells, with from 26 to 35 chromosomes, were found in some morphologically normal colonies. In one instance, 12 hyperploid spreads and a few normal ones were obtained from a terminal bud. This is the first report of hyperploidy in the Bryozoa.
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