Montgomery claimed in his paper published in 1911 that:

1. The entire cytoplasm, sphere, and mitochondria in Peripatus are stripped off and rejected during the last stages of sperm-formation.

2. That there is no acrosome in Peripatus other than the attenuated head of the sperm.

3. That the centrosome swells up to form a large bead stuck on to the elongating spermatid nucleus, and that this centrosome (centriole) eventually shrinks somewhat in size and forms a middle-piece between nucleus and flagellum.

4. That the sphere has no connexion with the formation of the acrosome.

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