Embryology of the Symphyla

OWING to the significance which is attached to the Symphyla in speculations on the origin of insects, a knowledge of their embryology has become desirable. Having recently obtained, in large quantity, the eggs of a local species of Hanseniella, I have been able to work out a fairly complete story of the development of these remarkable animals. A detailed account of this will be published later; the present note records a few points which are significant on phylogenetic grounds.