Abstract
In 1919 the late Professor Doncaster and the present author investigated the gametogenesis of the lice Pe die ulus corporis and Pedieulus capitis. An account of this work was published during the following year (3). The cytology of the spermatogenesis was found to be so peculiar and in some respects unique, that it was decided to extend the work to other lice. At the time of his death Professor Doncaster was working on the gametogenesis of the horse-louse and the doglouse. The material collected by him together with his notes was handed over to me by Professor J. Stanley Gardiner.

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