Abstract
There are 2 well-defined maturation divisions, both equational, in this rotifer. The zygoid chromosome number has been determined to be 13, of which 2 are dot-shaped and appreciably smaller than the rest. As to the other 11, it is difficult to be sure of the identity of any one of them when met in different cells. The chromosomes are in a condensed state and never despiralize at any time during the 2 maturation divisions. There are no indications of synapsis between any two chromosomes. The possibility of the loss of chromosome homology in this form is discussed.

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